Compilation
Oncidium variegatum

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Name

Identification
Oncidium variegatum (Sw.) Willd. [family ORCHIDACEAE ]
Related name
  • Oncidium variegatum

Flora

Entry for Tolumnia bahamensis (Nash ex Britton & Millspaugh) Braem [family ORCHIDACEAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 26,
Names
Tolumnia bahamensis (Nash ex Britton & Millspaugh) Braem [family ORCHIDACEAE], Orchidee (Hamburg), 37: 59. 1986
Oncidium bahamense Nash ex Britton & Millspaugh [family ORCHIDACEAE], Bahama Fl., 97. 1920
Oncidium variegatum (Swartz) Swartz [family ORCHIDACEAE]
Oncidium variegatum subsp. bahamense (Nash ex Britton & Millspaugh) Withner [family ORCHIDACEAE]
Treatment Author(s)
Mark W. Chase
James D. Ackerman
Information
Plants to 12 cm (excluding inflorescence). Leaves semiterete 3–10 × 0.4–1 cm. Inflorescences 1–4, erect, to 50 cm, side branches few or none, to 4.5 cm; bracts 2–6 mm. Flowers white with red-brown spots at bases of perianth parts; sepals spatulate, 4–6 × 1–2 mm, apex apiculate; lateral sepals connate to 3/4 length; petals spatulate to pandurate, 5 × 2 mm, apex rounded to retuse, often apiculate; lip with large red-brown spots near yellow callus, 8–12 × 8–13 mm, middle lobe about 1/3 wider than combined lateral lobes, apex retuse-apiculate, isthmus 0.2–0.4 cm wide with serrate margins; callus with 2 sets of tuberculate processes, 3 proximal, broader, 2 distal, smaller; column whitish to pale lavender with yellow base and white to rose-purple column wings 5–6 mm. Capsules 1.5 cm.
Phenology
apr-may (spring), jun (summer)
Altitude range
0–10 m;
Distribution
West Indies (Bahamas).USA Fla.
Discussion
Tolumnia bahamensis has been regarded by some authors as a synonym or variety of T. variegata (D. S. Correll 1950; C. L. Withner 1980). Flower morphology helps little in the T. variegata complex (J. D. Ackerman and M. Galarza-Pérez 1991); T. bahamensis differs, however, by being a tetraploid (84 chromosomes) and having semiterete leaves. These features also exist in T. sylvestris (G. J. Braem 1986b), a species of eastern Cuba generally found in high elevation pine forests, a habitat somewhat different from that of either Florida or the Bahamas. Whether or not T. sylvestris and T. bahamensis are conspecific awaits further studies.

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