Flora of Barro Colorado Island

Campylocentrum pachyrrhizum

(Reichb.f.) Rolfe, Orchid Rev. 11:246.1903

Leafless epiphyte; roots chlorophyllous, flattened, thin, 20-30 cm long, ca 2 mm wide. Racemes short, usually 2-3 cm long, densely flowered; floral bracts prominent, dark brown, the margins erose, persisting on fruiting inflorescences; flowers to 1.5 mm long; sepals very pale cream, subequal, to 4.5 mm long and 1.5 mm wide, acute at apex, the ventral margin of lateral sepals strongly inrolled; petals to 4 mm long and 1 mm wide, white, the ventral margin inrolled in lower half; lip white, spurred, shorter than petals, narrowly acute, the lower edges in­rolled, the spur nearly as long as the blade, extending well below the sepals. Fruits ovate-oblong, prominently ridged, ca 6 mm long. Shattuck 844.

Rare; collected once by Shattuck at Gross Point. His collection, made in late March, bears mature fruits. Florida, West Indies, Trinidad, French Guiana, Vene­zuela, and Panama (no doubt in Colombia as well). In Panama, only from the Canal Zone (BCI and Summit Garden).

See Fig. 163.