ORCHIDEiE. 607 



deciduotis. — The West Indian genera are mostly aerial, i. e. either epiphytes or develop- 

 ing their roots abo^e the ground, except the species oi Lijiaris aai Microatylis. 



1. PLEUROTHALLIS, R. Br. 



Lip jointed with the column : perigonial divisions exterior lateral mostly cohering, at 

 least at the base. Column devoid of lateral appendages at the summit : pollinaria 3, obovate- 

 globose. — Stem umally \-leaved, not produced beyond the leaf, except hy pedmncles or 

 scapes : no tubers ; flowers small, racemose or single, 



§ 1. Stem with appressed, flaccid sheaths at its nodes: leaf distant from its base, 

 * Racemes many-flowered. 



1. P. unWaginata, XsK^^. / Stem angular, longer than or as long as the leaf; leaf ob- 

 long or elliptical-oblong, tapering into the petiole, about as long as the elongated, 2-S-nate 

 racemes ; perigonial divisions exterior lateral cohering at the base, oblong, twice as long 

 as the obovate-oblong, naked lip. — Stem 8"-12", leaf 6"-10", flowers 4"' long. — Hab. 

 Jamaica !, Lindl., Manchester ; [Cuba !]. 



3. P. gelida, Lindl. " Stem augdar ; leaf oblong, petioled, about as long as the 

 geminate racemes ; perigonial divisions exterior lateral cohering to the middle ; lip cu- 

 neate-oblong, 3-lieeled at the middle." — " Very like the livst ; 1 high." — Hab. Jamaica ! 

 (Lindl.). 



3. F. Imrayi, Lindl.! Stem angular- striate, longer than the leaf; leaf broadly 

 ovate or ronndish ovate, twice as long as the fascicled racemes ; perigonial divisions ex- 

 terior lateral little cohering, oblong, interior half as long, obovate ; " lip much smaller, longi- 

 tudinally 2-crested."— About 1' high ; leaf 5"-4" long, 3V'-3i" broad j flowers 3'" long, 

 gibbous at the base. — Hab. Dominica I, Imr, 



4. P. floribunda, lindl. I Stem upwards S-edged, twice-thrice as long as the leaf 

 leif lanceolate, sessile, about as long as the fiexuose, fascicled racemes : bracts spreading 

 'tubular ; perigonial divisions neaily distinct, exterior oblong-lanceolate, half as long again 

 as the interior, the latter obovate, pointed, as long as the lip ; lip ovate, shortly 3-fid, 2- 

 crested : middle lobe longer, oblong, pointed. — Specklinia, lAndl. Dendrobium ophioglos. 

 soides, Sieb. Mart. 206.-^"-6" high ; leaf 3" long, 4'" broad ; flowers 2'" long, " yellow." 

 — Hab. Dominica-!, /mr. ; [Martinique!]. 



5. P. alpestris, Idndl. "Stem cylindrical, as long as or shorter than the leaf ; leaf 

 ovate-lanceolate, shorter than the filifirm, fascicled racemes ; perigonial divisions exterior 

 lanceolate, lateral cohering to the middle, interior much smaller, ovate, pointed ; lip minute, 

 ovate, blunt, concave." — S^. Adnot. t. 1. /. 5. — ^Dendrabium, Sw. — " Stem 2", leaf 2"-3" 

 long; flowers small, greenish-yellow, with a deep-purple lip." — Hab. Jamaica!, (Sm.), on 

 trees, in the highest mountains. 



6. P. laxa, Lindl. "Stem cylindrical; leaf oblong, about as long as the filiform, 

 solitary or fascicled racemes j perigonial divisions exterior ovate-lanceolate, lateral cohering 

 to the middle, interior one-thii-d as long, linear, pointed ; lip ovate, recurved, channelled." 

 — Dendrobium, Su>. — " Stem 2"-4" high ; flowers deep-purple." — Hab. Jamaica {Sw.), on 

 rtees, in the highest mountains. 



7. P. longissima, Lindl. Stem angular, as long as or twice as long as the leaf; leaf 

 leathery, spathulate-oblong, sessile, much shorter than the elongated, single raceme : flowers 

 oue-sided, greenish ; perigonial divisions oblong-lanceolate, exterior lateral cohering to or 

 to near the summit, interior little shorter (rarely half as long) ; Kp half as long as the pe- 

 rigoue, oblong, blunt, recurved-ascending above the cucullate base. — P. raceraiflora, Lindl. 

 Orch.) (exclus'. synonym.).— li'-2' high; leaf 4"-6" long, 1"-U" broad; raceme pedun- 

 cled, I'-l^' long, supported by an oblong sheath ; flowers 4'" long. — Hab. Jamaica !, Wils., 

 on trees, S. Mary's. 



8. P. racemiflora, LiMdl. {Fol. Orch), Stem angular, longer than the leaf; leaf 

 rigid, oblong, tapering into a petiole, half or one-third as long as the single (-geminate) 

 racemes: flowers one-sided, purple; perigonial divisons exterior oblong, pomted, lateral 

 cc|hering to about the middle, interior half as long, blunt ; " lip ovate-oblong, blunt."— Dendrd- 



