PLEUROTHALLIS 



53 



II. Spathe inconspicuous, scarious. "^ . 



A. Sheaths of the stem straight, adpressed, 

 not ciliate. 



1. Stem evident, leaf distant from hase. 



a. Racemes many-flowered, longer 



than the leaf or about as long. 

 Sepals yellowish-green, shortly 



acute, connivent 5. P. alpestris. 



Sepals brownish-purple, obtuse, 



connivent 6. P. muUirostris. 



Sepals deep purple, acuminate, 



divaricate 7. P. laxa. 



b. Flower-stalks with few flowers or 



only one, shorter than leaf. 

 Leaf 4 or 5 inches 1. Flower- 

 stalks very numerous, short, 



clustered 10. P. ruscifolia. 



Leaf less than 4 inches 1. 



Basal sheaths hirsute 8. P. hirsutula. 



Basal sheaths glabrous, ovary 

 smooth. 

 Petals not subulate. 

 Sepals greenish-yellow. 

 Leaf linear-lanceolate 9. P. pruinosa. 

 Leaf elliptical-lanceo- 

 late 12. P. Wilsonii. 



Sepals dark purple 11. P. hrachypetala. 



Petals subulate 14. P. Morrisii. 



Basal sheaths glabrous, ovary 



warty 13. P. monophylla. 



Leaf 8 or 9 inches 1. Sepals 



rough, about § inch 1. i 19. P. uncinaia. 



2. Stem very short, leaf close to the root. 



Stems clustered. i 



Flower-stalk shorter than leaf- 

 stalk. Capsule covered with 



soft prickles 18. P. tribuloides. 



Flower-stalk shorter than leaf. 



Capsule smooth 20. P. jamaicensis. 



Flower-stalks much longer than 

 leaf (or about as long in P. 

 lanceola). Capsule smooth. 



Leaf roundish 15. P. rotundifolia. 



Leaf not roundish. 



Flower-stalk with one flower ; 

 lateral sepals connate 



nearly to apex 16. P. corniculata. 



Flower - stalk few - flowered ; 



lateral sepals free or not 



more than i -connate. 



Flower-stalk much longer 



than leaf. 



Sepals, apex obtuse ; 



flower-stalk zig-zag 21. P. delicatula. 



Sepals, apex tailed 22. P. Helence. 



Flower-stalk about as long 

 as leaf :.. 23. P. lanceola. 



