ONCIDIUM GENUS SECTIONS AND SPECIES SPECIFIC CULTURE HABITAT INFORMATION
		SECTIONS SECTIONS
		The Oncidium Section HETERANTHA 24 species are included in this Section, which contains plants characterised by their conspicuous leaf bearing clustered or close together pseudobulbs. The sepals and petals are spreading, rarely bent back. The column is smooth, cuned like an "S" with an elongate proboscis-like rostellum. Normally developed flowers, which are produced in succession, are intermixed with aborted, star-shaped ones, consisting only of the linear segments.2 The species -are abortivum, acinaccum, brevilabrum, bryocladium, calanthum, cuencanum, cultratum, cycnicolle, dactylopterum, formosissimum, heteranthum, ionopterum, jamiesoni, lepturum, lucasianum, orbatum, ornithocephalum, orthotis, pentadactylon, retusum, rostrans, semele, virgulatum and weddellii.2 Oncidium heteranthum Williams describes7 acinaccum as being distinct and elegant, producing 25 mm flowers having white sepals, large violet petals with a white border, the lip of the same colour, shaded carmine. Spikes are 300 to 600 mm long. Calanthum has light yellow sepals and petals and a lip broad and coloured deep yellow, the crest and column stained red. The spike is long and many flowered. This is described as pretty and free flowering. Onc. rostrans is brightly coloured with flowers in dense clusters. Oncidium heteranthum is interesting as the illustration indicates, with aborted and entire flowers intermixed on the same spike, on small plants.6 Plants labelled Oncidium heteranthum, but with flowers differing from each other. The plants are from this section, but specific identification may not be accurate. The habitats are listed as Colombia, Peru, Venezuela, Ecuador and Brazil. Cool to intermediate conditions are indicated. The descriptions available indicate that there could be some interesting plants from this Section. Little specific information is available on these plants.     Return to ONCIDIUM REVIEW INDEX   *  ONCIDIUM SLIDE SHOW  * A  SERIES OF PHOTOGRAPHS OF ONCIDIUM ORCHIDS- click on above link A schedule of flowering times for the Crispa Section oncidiums is available on the follwing link Crispa Section flowering times Remember, growing orchids is all about enjoying your plants and sharing your growing success with friends and family. Good luck and good growing.