orchidej:. 60? 



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

 ing their roots abo« e the ground, except the species of Liparis and Microstylis. 



1. PLEUROTHALLIS, R. Br. 



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

 least at the base. Column devoid of lateral appendages at the summit : pollinaria 2, obovate- 

 globose. — Stem usually \-leaved, not produced beyond the leaf, except by peduncles 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. univaginata, Lindl. ! 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, 2-6-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 4T' long.— Hab. 

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



2. P. gelida, Lindl. " Stem angular ; leaf oblong, petioled, about as long as 4he 

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

 neate-obloug, 2-keeled at the middle." — "Very like the last; l'high." — Hab. Jamaica! 

 (Lindl.). 



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

 ovate or roundish 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, 2£"-3£" broad ; flowers 3'" long, 

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



4. P. floribunda, Lindl. ! Stem upwards 2-edged, twice-thrice as long as the leaf 

 leaf lanceolate, sessile, about as long as the flexuose, fascicled racemes : bracts spreading 

 tubular ; perigonial divisions nearly 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, Lindl. Dendrobium ophioglos- 

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

 —Hab. Dominica !, Imr. ; [Martinique!]. 



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

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

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

 ovate, blunt, concave."— £k>. Adnot. t. 1. /. 5.— Dendrobium, Sw.— " Stem 2", leaf 2"-3" 

 h>ng ; flowers small, greenish-yellow, with a deep-purple lip." — Hab. Jamaica !, (Sw.), on 

 trees, in the highest mountains. 



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

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

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

 — Dendrobium, Sw. — " 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: flower t 

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

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

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

 Orch.! (exclus. synonym.).— U'-2' high; leaf4"-6" long, 1"-U" broad; raceme pedun- 

 eled, l'-l|» Jong, supported by an oblong sheath; flowers 4'" long.— Hab. Jamaica!, mis., 

 on trees, S. Mary's. 



8. P. racemiflora, Lindl. (Vol. 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, pointed, lateral 

 cohering to about the middle, interior half as long, blunt ; " lip ovate-oblong, blunt."— Deudro- 



