ORCHIDACEAE. 97 



22. ONCIDIUM Sw. Vet. Akad. Stock. Handl. 21: 239. 1800. 



Mostly epiphytic orchids, with or without pseudobulbs, the leaves flat or 

 3-edged, elongated or short, the stems short, the peduncles or scapes lateral, 

 the flowers in loose racemes or panicles. Sepals nearly equal, spreading or 

 reflexed, the lateral ones connate in some species. Petals similar to the median 

 sepal. Lip clawed or sessile, 3-lobed, crested or tubercled, the middle lobe 

 broad, notched or 2-cleft. Column short, winged, without a foot. Anther 

 inclined, convex or semiglobose, 1-celled or imperfectly 2-celled; pollinia 2, 

 waxy, not appendaged. Capsule ovoid to fusiform, beaked. [Greek, referring 

 to the tubercled lip.] More than 400 species, natives of tropical and sub- 

 tropical America. Type species: Oncidium carthaginense (Jacq.) Sw. 



Terrestrial ; leaves 3-5 dm. long ; scape 1 m. or more high. 1. O. sphacelatum. 

 Epiphytic ; leaves 1-1.5 dm. long ; scape 3-5 dm. long. 



Leaves elongated-linear. 2. 0. ~bahamense. 



Leaves oblong-falcate. 3. O. lucayanum. 



1. Oncidium sphacelatum Lindl. Sert. Orch. under pi. 48. 1841. 



Pseudobulbs nearly cylindric, 8-12 cm. long, 1.5-2 cm. thick. Leaves 

 linear, elongated, 3-10 dm. long, 1-2 cm. wide, flat, finely many-nerved; scape 

 slender, 2 m. long or less, the flowers loosely panicled; bracts linear-lanceolate, 

 8-15 mm,, long; pedicels slender, 1-2.5 cm. long; sepals lanceolate, about 16 mm. 

 long, brownish, barred with yellow; petals similar to the sepals, but somewhat 

 broader and shorter; lip bright yellow, about as long as the petals, its middle 

 lobe 11-14 mm. wide; capsule oblong, about 2 cm. long. 



On the ground in pine-lands and coppices, Abaco, Great Bahama, Andros, New 

 Providence, Watling's Island, Crooked Island : Florida ; Cuba ; Central America. 



2. Oncidium "bahamense Nash, sp. nov. 



A stoloniferous plant, creeping along branches and tree trunks, with 

 equitant leaves which are long, curved and narrow, and a raceme of yellow 

 flowers much exserted beyond the leaves. Leaves up to 8, crowded at the 

 base, the lower 1 or 2 short, triangular and scale-like, the larger ones up to 

 2 dm. long, 2-3 mm. wide, laterally compressed, acutely angled on the back, 

 channeled on the upper side, smooth and glabrous, linear, acute; scape up to 

 4.5 dm. long, smooth and glabrous, with scattered ovate scarious acute scales 

 5-7 mm. long; raceme 5-7 cm. long, of 10-15 spreading flowers on slender 

 pedicels up to 1 cm. long, the bracts ovate, acuminate, about 3 mm. long; 

 dorsal sepal obovate-spatulate, concave, much narrowed at the base, emargi- 

 nate and apiculate at the apex, 1-nerved, 5-6 mm. long, about 3 mm. wide at 

 the broadest part when spread out; lateral sepals united to the apex into an 

 obovate-cuneate concave body about 6 mm. long and 4 mm. wide when spread 

 out, rounded-truncate at the apex, 2-nerved, running out into short apicula- 

 tions: petals obovate, 5-nerved, undulate on the margins, apiculate at the apex, 

 7 mm. long and 5 mm. wide; lip sessile with a broad rounded base, 9-10 mm. 

 long and 10-12 mm. wide, puberulent on the upper surface, of equal width at 

 base and apex, 3-lobed, the lateral lobes spreading and somewhat reflexed, 

 broad, rounded at the apex, irregularly crenulate on the margins, the middle 

 lobe much broader than long-, reniform, irregularly lobulate on the margins, 

 strongly emarginate at the apex, apiculate, the crest with two processes, one 

 of them with long lobes, the other smaller and with 3 lobes; column stout, 

 about 2.5 mm. long, the wings puberulent, ovate, rounded at the base, obtuse 

 at the apex, and extending considerably beyond the summit of the column, 3.5 

 mm. long and about '2 mm. wide. 



Type collected by L. J. K. Brace, at Eight Mile Rocks, Great Bahama, April 16- 

 May 8, 1905, 'no. 8689, in the herbarium of the New York Botanical Garden. A 



