‘Bucky,’ the Stinkiest Bulbophyllum

“Bucky’ and its large leaves

Every orchid has an interesting story. Once you look beyond their beauty, other captivating qualities emerge about virtually all of them. However, there are some that stand out and make their presence known in ways that simply cannot be ignored. Whether you like them or not, indifference is unlikely to be your response. In this regard, there is nothing subtle about Smithsonian Gardens’ magnificent specimen of Bulbophyllum phalaenopsis. Charmed by its pendant glossy leaves and their resemblance to a beaver’s tail, the donors of this magnificent specimen named it ‘Bucky’; a name that lives on.

At the time it was originally acquired, few people outside of Asia had seen this species, though many read about it and its remarkable ecology. The inflorescence (flower head) consists of a cluster of about 15 to 20 reddish-brown (meat-colored) flowers covered with papillae (fleshy projections) said to resemble wriggling maggots. Charming! Since it targets female carrion flies as its pollinator, engaging in ‘brood site deception,’ it also evolved a fragrance to match its appearance. Early writings about it claim that its blossoms emitted an aroma reminiscent of the stench of 1000 dead elephants rotting in the sun. While this is surely hyperbole, Smithsonian Gardens staff have been waiting for many months to experience Bucky’s olfactory charms. Incredibly, buds were forming under one of its huge floppy leaves which we didn’t observe until a visitor spied them during a greenhouse tour. We certainly would have noticed them the next day when they opened and started their fragrance treat, though, making the greenhouse almost uninhabitable for a few days.

Inflorescence of Bulbophyllum phalaenopsis

A monstrous plant from lowland Papua New Guinea, Bucky loves to be warm and humid all the time. Given its robust girth and thick pseudobulbs (storage organs in the stem), we water it daily and feed it frequently. It is the most famous species in Bulbophyllum section Macrobulbon, of which the Smithsonian Gardens Orchid Collection has an almost complete set. They all share the same pollination strategy so more very stinky orchids are soon to come! The surprising species epithet, ‘Phalaneopsis,’ was given because superficially the plant resembles Phalaenopsis gigantea, the largest Phalaenopsis species (native to Borneo). Other than both being in the orchid family, however, they are not at all closely related.

– Tom Mirenda, Smithsonian Gardens Orchid Collection Specialist 

Vanilla blooms abound!

This past December, Smithsonian Gardens large trellised specimen of Vanilla pompona graced our greenhouses with luxurious blooms. Beautiful umbels of impressive, successively blooming flowers appeared at every leaf node on this huge vining orchid. Even though each individual flower lasts less than 24 hours, so many new blooms opened daily that it was a true spectacle for several weeks. A sister species to the better known Vanilla planifolia, the source of the  delicious flavoring we all know and love, V. pompona differs in having a much larger, gullet shaped lip. Its seed pods are also used to make a type of vanilla extract, though only locally in Costa Rica and Panama where it grows. Many Vanilla species occur in tropical regions around the world (circumtropical) and therefore are thought to be among the most ancient of orchids, perhaps with a common ancestor existing when the continents were contiguous. Most of these other species are not used for flavoring.

With rampantly growing vines, these orchids climb quickly and become massive specimens in a short time. Generally, they will only bloom when they are very large and mature. Like a philodendron, their plant habit is a combination of terrestrial and epiphytic. Starting as terrestrial plants with thick fibrous roots, aerial roots arising from the leaf axils clasp the sides of trees as they climb upward searching for higher light in which to bloom. They are easy to propagate from cuttings, but as with any succulent, it is best to let the cuts callous for a few days before planting them or they are sure to rot. Indeed, Vanilla plants in Madagascar plantations have fallen prey to a fungal disease in recent years.  We produce pods on our plants by pollinating the flowers by hand (“selfing”) as they do in vanilla plantations in Madagascar and the Mascarene Islands.

– Tom Mirenda, Smithsonian Gardens Orchid Collection Specialist 

The Critical Importance of Water Quality for Living Collections: Planning Ahead

Objects and artifacts in a museum collection are typically housed in cases and cabinets with drawers or shelves. As a living museum, Smithsonian Gardens’ plant collections are maintained in the landscape and in a large greenhouse facility. Because plants are living specimens that require vitamins, nutrients and other sources of energy, they must be monitored and nurtured daily. Water is a critical component of this care. Photosynthesis, transpiration (water movement through a plant and subsequent evaporation from plant leaves), and the transfer of vitamins and minerals from the soil to the plant are all dependent on the presence of water.

Water quality and availability are key factors to plant maintenance in a public garden. Things like droughts, floods, and other natural disturbances must be considered when developing a plan of care for each garden and/or collection. Throughout its gardens and landscapes, Smithsonian Gardens utilizes an irrigation system that uses 30-50% less water than conventional watering, improves plant growth by extending watering times, prevents soil erosion and nutrient runoff, and ensures that plants are watered without wetting leaves, which helps prevent fungal disease.

Irrigation system visible during construction of Folger Rose Garden 

Water quality is also of critical importance when it comes to successful orchid cultivation and maintenance. Orchid species exposed to municipal water–such as that which the Smithsonian Gardens Orchid Collection (SGOC) currently uses–exhibit detrimental physical manifestations caused by the accumulation of salts in the growing medium. These adverse effects include leaf tip burn, decreased plant vigor, reduced blooming, discoloration, and even death.

Dendrobiums grown with municipal water (left) compared with ones grown with reverse osmosis water. 

To have access to high quality water for the long-term care of SGOC, Smithsonian Gardens recently secured funding from the Smithsonian’s Collections Care and Preservation Fund* to install a customized rainwater harvesting system at its Greenhouse Facility. The system will collect, filter and store rainwater in a large tank or modular chamber. This is a preferable alternative to filtering municipal water for several reasons. First, filtering does not remove all of the added compounds found in municipal water. Additionally, rainwater has a similar pH to that of reverse-osmosis (R/O) water, which is currently used for our most delicate specimens. Smithsonian staff are currently visiting local universities and public gardens with large-scale water harvesting systems to glean ‘lessons learned’ from each project and to determine whether an above-ground or underground cistern (water storage tank) makes the most sense for SGOC’s year-round water use.

Example of above-ground cistern at the University of Maryland. 

Example of a modular storage chamber which allows for a much shallower excavation and ease of transport to a site. 

The plan is for rainwater to be collected from the roof of the Smithsonian Gardens Greenhouse Facility then pumped under pressure from a cistern through a filtration system to remove particles at the micron level. From there, the rainwater will be disinfected using ultraviolet light to destroy any microorganisms that are detrimental to orchid health. Finally, the rainwater will be pumped to a hose connector in each of the four orchid greenhouses for use when staff are watering.

*This project supports innovative and sustainable collections care which will have a direct, substantial, and permanent impact on the health and preservation of the Smithsonian Gardens Orchid Collection. It was made possible with financial support from the Smithsonian Collections Care and Preservation Fund, administered by the Smithsonian’s National Collections Program and the Smithsonian Collections Advisory Committee.

– Sarah Hedean, Living Collections Manager 

 

Things are getting fat in the Ripley Garden!

Fat in a succulent sort of way, that is!

Two years ago, I started playing around with growing plants vertically using a system of trays specifically designed for such use (Going Vertical in the Mary Livingston Ripley Garden). During that first year, I planted the trays with creeping thymes, and other low-growing selections in an effort to create a mosaic of colors and form. This was successful, but I knew it could be better.

The next year I used all sun-loving succulents in an awe-inspiring range of colors, textures, and forms which allowed me to have fun creating a living tapestry that would thrive with low-water usage.

Succulents overwintering in our greenhouse facility.

The response to my succulent experiment was so positive that I knew it had to come back. So before deadly frosts arrived, I dismantled the wall and sent it back to the care of our wonderful growers, Joe Curley and Jill Gonzales, to overwinter in the Smithsonian Gardens Greenhouse Facility. The plants flourished under their care and the wall is back this year, bigger and better than before!

2016 Green Wall 

But what else can be done with succulents? Could I create succulent topiary-like balls? Why not try?!  Again with the help and support of our greenhouse staff, this past winter, I purchased some pre-made metal frame spheres that were stuffed with sphagnum moss and secured with fishing line.

Sphagnum moss spheres ready for succulent additions.

I got various sizes of these spheres and plugs (small rooted plants) of assorted succulents.  The first thing I did was submerge the dry spheres in a bucket of water to soak the moss thoroughly.  Then I started playing with the little plugs and began creating artistic designs of color and form all over the spheres. I added holes in each moss ball and placed starter plants in, securing them with florist pins when necessary.

Succulent plugs

Me, enjoying design experimentation with the succulent spheres

After creating the spheres, they were once again in the hands of our great growers who cared for and nurtured them until they were established enough to put on display in the garden.

Early phase succulent sphere 

They are now scattered throughout the Ripley Garden, hanging from various structures and lamp posts.  Come on by and check them out—I think they turned out pretty well and am excited to see them completely filled in.

The succulent spheres at home in the Ripley Garden!

I check them frequently to see if they need watering since the sphagnum moss dries out quickly, but succulents are engineered to handle times of drought, so they should continue to thrive in the absence of much water, though I am not sure just how much!

So, once again, I am experimenting and learning new things all the time.  I have no idea how the succulent spheres will do this summer, but that is part of the fun of gardening, isn’t it?

Happy Gardening!

– Janet Draper, Mary Livingston Ripley Garden Horticulturist 

Smithsonian Gardens Living Collections: The Orchid Inventory

One of the most important aspects of managing a museum collection is the inventory. For a living collection like the Smithsonian Gardens Orchid Collection (SOGC) there is a significant turnover of collection material due to plants’ natural life cycles and/or disease. Therefore, a regular inventory of the contents of each of the orchid greenhouses enables Smithsonian Gardens to reconcile any plants that were not deaccessioned properly in the past, relabel orchids that are missing accession tags, and update plant locations arising from moves in and out of the greenhouses for displays, exhibits, and lectures throughout the year.

Another important reason that Smithsonian Gardens conducts inventories of the orchid collection is to maintain the readability of the plants’ accession labels. The SOGC uses plastic tags that are printed with each plant’s accession number, a scannable barcode, and are overlaid with UV protection. Even with this protection the labels fade over time due to being in the direct sun, generally lasting about four years before they become unreadable.

Example of a new accession label vs. an older accession label.

Each summer, a Smithsonian Gardens intern takes on the responsibility of inventorying a portion of the orchid collection. This year, thanks to a new Collections Information System (CIS), the process of scanning, printing, and reattaching accession labels is much more streamlined. Our exceptional orchid intern, Ming, completed the inventory in one greenhouse in half the time it has taken in years past!

The inventory process requires Ming to scan each plant’s accession label barcode using a handheld device. The handhelds are equipped with a condensed version of the CIS which is adequate for fieldwork. Inventory lists are synced back to the main CIS so that new barcode labels can be generated, printed and reattached to plant pots using hog rings.

Our orchid intern, Ming, hard at work in one of the greenhouses.

Learn more about our collection inventory in July by following Smithsonian Gardens on Facebook, Twitter and Instagram!

– Julie Rotramel, Living Collections Specialist, Smithsonian Gardens

A Floral Firework Display: What’s Blooming in the Smithsonian Gardens Orchid Collection

Sunday is the final day of the 2016 orchid exhibit, Orchids In Focus, at the United States Botanic Garden (USBG). It has been an interesting season to say the least, with seventy degree weather in January and gusting winds throughout March. Most of our show plants are bloomed out and will start their recovery for next year’s blooming cycle. Our species orchids are not on such a rigid schedule and are still living the slow life in the greenhouses, blooming when they please and offering visual fireworks of color amidst the overwhelming background of green foliage.

Scaphyglottis bidentata is a dazzling miniature orchid from Central and South America. This species exhibits spectacular red-orange flowers, a pollination syndrome for ornithophily, or bird-pollination. Several other Scaphyglottis with large (relatively), bold flowers were previously classified under a distinct genus, Hexisea but were morphologically similar enough to the former Scaphyglottis grouping to be lumped together. One of the major defining morphological characteristics of species in this group is that the pseudobulbs are stacked (see inset photo).

(left) Scaphyglottis bidentata, (right) illustration from Edwards’s Botanical Register

Another striking pop of color found in our species greenhouse comes from Dendrobium bracteosum var. tannii. If you look this one up, you won’t find tannii mentioned anywhere because the name has never been formally published. This variety is a miniature form of the species. To give you an idea of the size difference the flowers on our specimen are no longer than a centimeter in diameter, which is less than half of the typical size.

Dendrobium bracteosum var. tannii

Dendrobium sanguinolentum is a pendant growing epiphyte found in Thailand, Western Malesia and the Philippines. This species is known as “The Blood Stained Dendrobium” because the flowers typically have splotches or stains of violet at the edges of the sepals and petals. The plant below may be an alba form of this species since there are no stains evident on the pale yellow flower.

Dendrobium sanguinolentum

This week’s grand finale is Myrmecocattleya Claudia Elena. This fantastic hybrid with such vivid coloration is a cross between Myrmecophila tibicinis and Cattleya dowiana. In the wild, the ranges of these two species do not overlap, but since they are both part of the Cattleya alliance, hybridizers are able to successfully interbreed them. Myrmecophila flowers are typically one to two inches in diameter, but when crossed with a large flowered Cattleya, they almost triple in size!

Myrmecocattleya Claudia Elena

Photographs are a wonderful way to explore nature’s diversity, but nothing compares to experiencing it in person. If you are in the Washington, D.C. area, make sure to take a final trip to the USBG to see our orchids on display before the exhibit ends on the 17^th!

-Julie Rotramel, Living Collections Specialist

Three Cheers for Spring: What’s Blooming in the Smithsonian Gardens Orchid Collection

It’s finally spring! Today marks the fifth day past the Spring Equinox and it seems like nature is as ready as we are for the change in season. Around the city cherry and magnolia trees are bombarding the city with their pink blossoms and fresh fragrance. Splashes of color from daffodils and pansies are everywhere. Though the season’s change is much more gradual in our orchid greenhouses, this time of year still finds unparalleled variety and interesting stories to tell in our species collection.

This first species was part of a donation we received last summer. It entered our collection as Acianthera aculeata, but now that we have seen the plant in bloom, it doesn’t quite match the type description for the species. A proper identification will require more research for our orchid curators.

Acianthera sp.

Regardless of its specific name, one characteristic I find fascinating about this orchid and many other Pleurothallids is that the flower spikes arise from the base of the leaf rather than closer to the root structures. This makes the flowers appear to grow right on the leaf surface, which has an interesting effect. Many Pleurothallids are thought to engage in brood site deception, and it can be speculated that these small, wine colored flower umbels mimic the perfect egg-laying site for the plant’s pollinators.

Mediocalcar decoratum is a mat forming epiphyte found in the cloud forests of New Guinea. The miniature orange and yellow bell-shaped flowers are scattered evenly throughout the foliage like someone’s lost candy corn and lend a generally cheerful aspect to the plant. This may be why it is commonly known as the Charming Mediocalcar.

Mediocalcar decoratum

Last but not least is the ever popular Dendrobium secundum, commonly referred to as the Toothbrush Orchid. This often pendulous species is found throughout Southeast Asia. Its inflorescence of bright pink flowers opens successively (but not fully) at the end of a leafless cane giving it the appearance of bristles at the end of a toothbrush handle. The alba form is also quite beautiful with waxy white flowers and a yellow lip.

Dendrobium secundum

To see more of our collection, visit the orchid exhibit, Orchids In Focus, at the United States Botanic Garden now through April 17th.

-Julie Rotramel, Orchid Collection Specialist

 

A Tropical State of Mind: What’s Blooming in the Smithsonian Gardens Orchid Collection

It’s March and it definitely feels like spring. This week’s blooming orchid selections are inspired by the tropical weather we’ve been having the past few days. Our species greenhouse has been looking rather tropical as well…

First on our list this week is Bulbophyllum saurocephalum, which is an epiphytic Philippine species. This odorless plant is also known as the Lizard Head Bulbophyllum because of the numerous tiny flowers that seem to be rearing their striped heads from the surface of the rachis.

Bulbophyllum saurocephalum

The Lizard Head Bulbophyllum

 

Another drastically different Bulbophyllum that is blooming not far from B. saurocephalum is Bulbophyllum compressum. This is a hot growing Indonesian species found at lower elevations, with beautiful, ovate floral bracts of up to 30 delicate,white flowers.

Bulbophyllum compressum

 

I tend to gravitate towards the strangeness of Bulbophyllums, but I recognize that there are many other genera that are equally fascinating and worthy of mention. Below is the tiny flowered Tolumnia bahamensis.

Tolumnia bahamensis

Not only is this a fascinating North American species, it is highly appropriate to our tropical theme for this week. This species starts its life as a terrestrial in sandy soil, and as it matures, will send out growths that attach to taller plants, transitioning to an epiphytic habit.  Tolumnia bahamensis is only found in Atlantic coastal scrub habitats and is considered highly endangered. Atlanta Botanical Garden has been leading reintroduction efforts in Florida with much success.

To see part of the Smithsonian Gardens Orchid Collection on display, visit the Orchids In Focus exhibit at the United States Botanic Garden through April 27!

–Julie Rotramel, Living Collections Specialist, Smithsonian Gardens

Rare and Beautiful Orchids (and a Horticulturist) Find Home at Smithsonian Gardens

Imagine opening an innocuous cardboard box and finding this inside!

Paphiopedilum Chiu Hua Dancer

I was fortunate to have this pleasure on one of my first days on the job as a horticulturist with Smithsonian Gardens. Already amazed (and slightly overwhelmed) by the diversity of orchids in the Smithsonian Gardens Orchid Collection, my first week on the job included helping my colleagues unpack a tractor trailer full of boxes containing a major donation of orchids.

Anne, a Smithsonian Gardens volunteer, assists Emily and the other greenhouse staff unpack boxes of donated orchids.

Hundreds of specimens were added to the orchid collection at the Smithsonian Gardens Greenhouse Facility in Suitland, MD. The plants were part of an extensive collection owned by the late Denis Roessiger of Penobscot, ME, that have been generously donated by his wife, Lucybelle.

Horticulturists from the Smithsonian Gardens greenhouses journeyed to Maine to select and carefully pack up the orchids, which then travelled overnight by truck to the Suitland greenhouse facility. There, greenhouse staff and volunteers eagerly unloaded and unpacked the vast array of plants. “This donation is exceptional in that 99% of the orchids are species orchids or rare hybrids,” commented Smithsonian Gardens Orchid Specialist, Tom Mirenda.  The donation is a major addition to the Smithsonian Gardens’ collection, adding entirely new genera to it and increasing the species abundance and overall diversity.

I asked Tom Mirenda to give me a walk-through of the highlights of the donation. Here are his top picks:

(L to R) Bulbophyllum amplebracteatum subsp. carunculatum ‘Sunset Valley Orchids’ and Bulbophyllum cocoinum

Over 200 new Bulbophyllum specimens now complement the already extensive collection of this genus maintained by Smithsonian Gardens. Bulbophyllum is one of the largest and most ancient genus of orchids; found in tropical forests around the world, they are often odd-looking plants with peculiar, sometimes foul, fragrances.  “One of my favorites currently in bloom is Bulbophyllum cocoinum, which has a coconut fragrance,” says Mirenda.  The donation also included fifteen species of Trichoceros, a new genus for the collection. Trichoceros are epiphytic and terrestrial orchids native to the Andean Mountain range in South America.

(L to R) Lycaste deppei Superb and Phrgmipedium Fritz Schomberg

The donation tripled Smithsonian Gardens’ collection of hard to find Maxillaria orchids, and added 50 to 70 species of Restrepia and several large specimen Coelogyne and Dendrochilum. Also new to the collection are several Lycaste and Dracula species.  Rare color forms of Laelia and Cattleya now grace the collection. Orchid enthusiasts will swoon at the large addition of South American Slipper Orchids (Phragmipedium), particularly the controversial Phragmipedium kovachii—the orchid at the heart of the book, Scent of a Scandal.

(L to R) Vanda Hiyasmin ‘Korat’ and Vanda Pachara Delight “Isabella’

Large, brilliant, purple flowers of an eight-foot Vanda were one of the showiest surprises during unpacking. One of the Smithsonian greenhouses has been transformed with the addition of roughly 40 Vandas now hanging from the ceiling and suspended racks.

Vandas hanging in one of Smithsonian Gardens’ orchid greenhouses.

With the acquisition of these plants, our orchid collection now has well over 10,000 specimens. “By continually building our collection in this way, we have made the Smithsonian Gardens Orchid Collection a true scientific resource,” says Mirenda.

– Emily Cook, Horticulturist, Smithsonian Gardens

A Spectacular Show: What’s Blooming in the Smithsonian Gardens Orchid Collection

The sight of fresh blooming encyclias is one to tease the eyes. Generally small flowered and often less than an inch in diameter, encyclias pack a punch with their unending shape and color variations. Orchid lovers could spend days observing these species and hybrids. This hardly comes as a surprise when you take into consideration that there are over 150 species in the genus.

Encyclia Nursery Rhyme

Originating from the Greek word, enkylein, the name encyclia refers to the way the lateral lobes of the flower encircle the column. Found from central Florida to Brazil, these orchids grow in warmer climates and produce psuedobulbs in clumps. Each clump sends up several flower spikes at a time and each variety of encyclia has flower spikes that range in a length from a foot to several feet long. Since each spike can produce many flowers these spikes make for quite a spectacular show.

A clustering of Encyclia oncidioides behind Encyclia Cindy.

I find these orchids very pleasing to observe. Their small flowers make them manageable to view, but contain subtle details that are a delight to discover. These flowers have great depth to them, so changing your angle of view can reveal more interesting characteristics.

Encyclias are often crossed with the genera Cattleya and Epidendrum to create lovely hybrids. Encyclias are desirable for their interesting flower shapes and Encyclia cordigera in particular often is selected for hybridization for its darker colors and intoxicating aroma. Encyclia cordigera has received over 40 awards from the American Orchid Society, so why not pass along some of these winning characteristics to other orchids?

Encyclia Atroniceum x bractescens

Encyclia alata x mooreana

In the Smithsonian Gardens Orchid Collection, there are currently over 60 examples of these encyclia species and hybrid combinations. Their flowers last up to a month sometimes longer, so they regularly make their way to the display cases in museums around the Smithsonian. Be sure to swing by the orchid cases downstairs in the National Museum of American History sometime in the next few weeks to see one of these incredible orchids on display.

– Alan Marcus, Smithsonian Gardens Orchid Intern

Encyclia Cindy