Tuesday, November 27, 2012

What is Stanhopea?




I was asked to make a brief outline of Stanhopea so that those individuals who visit this site are provided general information for this orchid group.  Stanhopea is a genus within the Orchidaceae (The Orchid Family).  These orchids are epiphytic (grow on trees), and occasionally semi-terrestrial (found growing in leaf mold and duff) on slopes.  They grow in moderate to high rainfall areas in tropical and subtropical climates, and are native to Mexico, Central America, and South America (see the table below for the number of species per country).  These orchids grow in forests receiving part to deep shade, and in habitats from near sea level up to 9,840 ft. (0 to 3,000 m). Several species grow in mountain foothill forests and many species can survive short dry seasons.  There are approximately 65 species currently recognized with 5 natural hybrids and dozens of man made hybrids registered.


Country
Number
of Species
Country
Number
of Species
Country
Number
of Species
Country
Number of Species
Argentina
1
Costa Rica
11
Guyana
1
Paraguay
1
Belize
3
Ecuador
12
Honduras
6
Peru
13
Bolivia
5
El Salvador
4
Mexico
13
Suriname
1
Brazil
6
French Guiana
1
Nicaragua
9
Trinidad
1
Colombia
19
Guatemala
8
Panama
13
Venezuela
5

   Table of Stanhopea species listed by country. This list includes the five known natural hybrids. 

This orchid genus is known for prominent pseudobulbs that are oval to rounded in shape, from 1.0-2.0 in. (2.5-5.0 cm) wide, topped with a single lanceolate to elliptic shaped leaf.  The plants are usually small to moderate sized orchids from 8.0-26.0 in. (20 cm to 65 cm) tall.  The unusual nature of blooming and presentation of the inflorescences by growing through the bottom of growing media is a unique characteristic of these orchids.  The pendent inflorescences require that the orchid be grown in wire baskets to allow the inflorescence to mature.  The flowers are fantastic in their shape and complexity, and have  an intricate pollination biology.  For additional information on the flowers of Stanhopea see the The Stanhopea Morphology Page.

Micaela's Stanhopea graveolens
growing in a greenhouse

The genus was named by John Frost after the Fourth Earl of Stanhope - Sir Philipp Henry (president of the Medico- Botanical Society of London at the time) and described by William Jackson Hooker in 1829.  Stanhopea insignis is the species that was first described within the genus Stanhopea; however, Stanhopea hernandezii  was described first under a name derived from the Aztec language(Coatzonte Coxochitl) in Francisco Herdandez’s work Rerum Medicarum Novae Hispaniae Thesarus finalized in 1575.  It is interesting to note that in the Aztec language (Nahuatl) the word coatzontecoxóchitl can translate as "snake-head flower" (Ossenback, 2009).  This word or similar words were used by the Aztecs to describe several orchids including S. hernandezii and S. tigrina.  These and other orchids were revered by the Aztecs for their beauty and fragrance (Bateman, 1837-43) and several were used in decoration (Hagsater et al., 2005).  It is clear from these accounts that the Aztecs were also captivated by Stanhopeas!  For a more detailed account of the history of Stanhopea see (Jenny, 2010).

References:
Bateman, J. 1837-43.  The Orchidaceae from Mexico and Guatemala. J. Hidgway and Sons, London.
Hágsater, E. Soto Arenas, M.A., Salazar, G., Jiménez, R., López, M. and Dressler, R. 2005. Las Orquideas de México, Productos Farmaceuticos, S.A. de C.V., México.
Jenny, R. 2010.  The Stanhopea Book.  Imprenta Mariscal, Quito, Ecuador.

Ossenback, C. 2009. Orchids and orchidology in Central America: 500 years of history. Lankesteriana V. 9, 1-2.


Saturday, November 17, 2012

Stanhopea costaricensis

Stanhopea costaricensis inflorescence

Stanhopea costaricensis is native to Costa Rica, Nicaragua, and Panama from elevations 1,640 to 3,280 feet (500 to 1000 m).  It is native to tropical and warm forests, and grows best in intermediate to warm conditions. This species does not tolerate low humidity and high light situations and the leaves can burn easily in direct sun.  The inflorescence is up to 8 inches (20.3 cm) long and often 3-5 flowered, making this a good choice for large basket culture.  The flowers are 5.5 inches (14 cm) wide and resemble those of S. oculata.  However, the hypochile has a restricted center portion that makes it form two broad segments that are almost unique in Stanhopea (S. gibbosa has a similar shaped hypochile).

Stanhopea costaricensis flowers

This is a seedling that I purchased from Tropical Orchid Farm of Hawaii and it has a light yellow to cream color in the sepals and petals with several torus shaped (like the letter O) spots that are reddish brown.  The petals have two solid distinct eyes in the same color.  The hypochile is light pink to flesh colored and has dark red eyes and is stippled with red to dark pink small spots.  The mesochile is cream colored and the horns are the same color with the interior portion exhibiting several pink spots.  The epichile is also cream colored with dark pink spots.  This form is an example of variation seen in the species with some forms having less pink and more yellow in the hypochile.  Seedlings can pay off sometimes providing some of the most favorable color variations and spot characters.

Stanhopea costaricensis flower close-up
 
The fragrance of this orchid is camphor scented when it first opens and later it is a combination of camphor and cinnamon.  This species has become one of my new best favorites and a nice fall bloomer that extends the blooming season for my Stanhopea collection!

Wednesday, November 7, 2012

Stanhopea candida

Stanhopea candida

Stanhopea candida inflorescence

This orchid is native to warm forests and foothills of Brazil, Colombia, Ecuador, Peru, and Venezuela.   It is found at elevations from 330 to 1,970 feet (100 to 600 m).  This is one of the several Stanhopeas that need warm temperatures all year around, so I bring the plant inside the house from November through March.  I grow it outside in the spring and summer months on the north side of the house where it receives indirect light and mostly shade.  This orchid enjoys a warm and humid atmosphere with a relatively moist growing medium.  It also grows well in ventilated ares with a good breeze.  The fragrance of S. candida is primarily the scent of wintergreen.  Wintergreen is one of the major components in the pain reliever Bengay, so that is exactly what this flower smells like, though it is rather light in scent.  This is a fall blooming species of Stanhopea, though some have reported that it also blooms in the spring.
 
Stanhopea candida hypochile with
small pink spots

This Stanhopea is closely related to S. grandiflora and S. reichenbachiana.  The flowers are small (2.75 to 3.15 inches – 7.0 to 8.0 cm) wide, primarily white, and have no real horns.  There are two short curved projections on either side of the upper hypochile.  The remaining hypochile is joined into a short tube that opens to both the upper hypochile and epichile.  On the front side of the hypochile are small pink spots, the only other color on this flower.  The epichile is a short lanceolate shaped projection.  The column is an off white color that is infused with green and is almost florescent. The leaves of S. candida are usually 9.8 to 19.6 inches (25 to 50 cm) long; however, my form has shorter leaves 9 to 12 inches (22.8 to 30.5 cm) long and 2.5 to 4.2 inches (6.4 to 10.7 cm) wide.  These orchids are  rather short  with small pseudobulbs 0.75 to 1.2 inches (1.9 to 3.0 cm) wide at maturity.  The plant may be smaller in size because it is still a little young.  I also grow it outdoors in the summer where it is less humid and warm in comparison to the tropical conditions the orchid finds acceptable.


Stanhopea candida hypochile and column

In side profile the hypochile has a rather rectangular configuration.  The buds of this species emerge through the inflorescence bracts rather early in development, and spend a large amount of time developing outside the bracts.  This is in contrast to many other Stanhopea that allow the buds to develop for a long time inside the inflorescence bracts before they emerge.