MANUAL OF THE GRASSES OF THE WEST INDIES - 195 
Glume and sterile lemma inflated and crumpled. 
Spikelets 2 mm long; glume and sterile lemma not 
pointed beyond the fruit__41. P. pIstoRTUM. 
Spikelets 2.7 to 3 mm long; glume and sterile lemma 
pointed beyond the fruit_42. P. LINDENIANUM. 
Sterile lemma not wrinkled nor crumpled. 
Spikelets 3 to 3.3 mm long. 
Spikelets glabrous, in pairs________ 37. P. ROCANUM. 
Spikelets pubescent, solitary. 
Blades elongate, glabrous__38. P. ALTERNIFLORUM. 
Blades less than 20 cm long, conspicuously pilose. 
39. P. ROTTBOELLIOIDES. 
Spikelets not more than 1.8 mm long. 
Blades not more than 1 mm wide, concavo-convex or 
subterete in cross section. 
Plants delicate; blades capillary, subterete. 
47, P. CAPILLIFOLIUM. 
Plants wiry; blades concavo-convex. 
40. P. FILIFORME. 
Blades or some of them 2 mm or more wide; flat or 
involute. 
Spikelets elliptic, glabrous______-_- 45. P. RUPESTRE. 
Spikelets oval, pubescent________-. 46. P. SAUGETII. 
Racemes 2 to many. 
Glume and sterile lemma conspicuously crumpled. 
4 P. LINDENIANUM. 
Glume and sterile lemma not crumpled or but slightly so. 
Plants creeping, rooting at the nodes. 
Spikelets suborbicular___________-_ 53. P. ORBICULATUM. 
Spikelets more or less elliptic. 
Spikelets pubescent, blunt_______- 54. P. REPTATUM. 
Spikelets glabrous, or obscurely pubescent at base 
only; subacutess. 2225.25 55. P. AMPHICARPUM. 
Plants not creeping, sometimes rooting at 1 or 2 nodes of a 
decumbent base, if so, spikelets in pairs. 
Spikelets conspicuously silky-ciliate around the margin, 
the hairs as long as the spikelet or longer. 
Racemes commonly 3 to 5; culms geniculate at base. 
57. P. DILATATUM. 
Racemes commonly 12 to 18; culms erect. 
535) PS URVALLET. 
Spikelets not conspicuously ciliate. 
Fruit dark brown and shining; spikelets glabrous 
or minutely appressed-pubescent. 
Spikelets obovate, turgid; sterile lemma wrinkled 
just within the margin__-_-_- 66. P. PLICATULUM. 
Spikelets elliptic, depressed, not turgid. 
Plants subaquatic; rachis 1.5 to 2 mm wide. 
67. P. WRIGHTII. 
Plants terrestrial; rachis 1 mm wide. 
Racemes not more than 5 em long; foliage 
plabrous 3: 2k ee 68. P. MOTEMBENSE. 
Racemes 8 to 15 em long; sheaths and blades 
hirsute at their junction. 
69. P. URBANIANUM. 
Fruit pale to stramineous (brown but not shining in 
P. virgatum). 
Plants robust; culms commonly more than 1 m, often 
2 m tall; spikelets normally in pairs. 
Culms freely branching. Racemes 10 to 45; 
spikelets elliptic, glandular-pubescent. 
65. P. cCORYPHAEUM. 
