MANUAL OF THE GRASSES OF THE WEST INDIES 243 
Foliage not soft and lax; plants branching from the culm nodes. 
3a. Blades long, stiff, conspicuously striate, tapering from base to apex; 
autumnal phase bushy-branched above; spikelets turgid, attenuate 
at base, mostly pustulose-pubescent (Angustzfolia). 
INodeshoearce dimen (one aes anise 62. P. CHRYSOPSIDIFOLIUM. 
Nodes not bearded. 
Autumnal blades flat; lower panicle branches spreading or deflexed. 
6 P. ANGUSTIFOLIUM. 
Autumnal blades involute; lower panicle branches more or less ascend- 
ing. 
Spikelets 3 to 3.5 mm long, pointed_________- 63. P. FUSIFORME. 
Spikelets less than 3 mm long, not pointed or obscurely so. 
Plants glabrous or nearly so; autumnal culm erect. 
66. P. NEURANTHUM. 
Plants pubescent, at least on the lower half. 
Spikelets about 2.4 mm long; vernal blades 7 to 12 em long; 
autumnal blades not faleate______ 65. P. ARENICOLOIDES. 
Spikelets about 2 mm long; vernal blades 4 to 6 cm long; 
autumnal blades much crowded, falcate. 
67. P. ACICULARE. 
3b. Blades not long and stiff; culms not bushy-branched. 
Spikelets subglobose or pyriform. 
Blades spreading, rarely over 5 cm long and 5 mm wide; spikelets 
pyriform; autumnal phase bushy-branching (Lancearia). 
Spikelets about 1.5 mm long____________-_ 83. P. PORTORICENSE. 
Spikelets about 2 mm long. 
Blades firm, glabrous above; culms stiffly ascending. 
85. P. LANCEARIUM. 
Blades lax, softly puberulent on both surfaces; culms decumbent. 
8 P. PATULUM. 
Blades erect, 7 to 138 cm long, 7 to 14 mm wide, spikelets sphaeroidal 
(Sphaerocarpa). 
Culms spreading; panicle nearly as broad as long; spikelets about 1.7 
OANA) VOY Oye Sane 9 So Re Toh eal ae ea hs i a a 78. P. SPHAEROCARPON. 
Culms erect or ascending; panicle never more than two-thirds as 
broad as long; spikelets about 1.1 mm long. 
79. QP. ERECTIFOLIUM. 
Spikelets not subglobose nor pyriform-elliptic. 
4a. Ligule of conspicuous hairs usually 3 to 5 mm long. 
Sheaths glabrous or only the lowermost somewhat pubescent; 
spikelets not more than 1.8 mm long (Spreia). 
Culms and sheaths glabrous_________- 73. P. LONGILIGULATUM. 
Culms and sheaths appressed-pubescent. 
Spikelets 1.2 to 1.3 mm long________.._- 71. P. LEUCOTHRIX. 
Spikeletsml, mama oMmewar. wee 2S eS Pees 72. P. WRIGHTIANUM. 
Sheaths strongly pubescent (Lanuginosa). 
Spikelets about 2mmlong. (See also P. viscidellum.) 
74, P. ACUMINATUM. 
Spikelets about 1.5 mm long. 
Blades velvety-puberulent with long hairs intermixed. 
P. ALBEMARLENSE. 
BAC CS VAN OUS meet. ce rewe See beenn. Oats Spemaeae Se 76. P. AUBURNE. 
4b. Ligule obsolete or nearly so (manifest in P. viscidellum). 
Spikelets about 3 mm long, elliptic, pubescent; blades somewhat 
COLCA LEH (CONTI UEAT) ee ee ee ee ee 88. P. JOORII. 
Spikelets less than 3 mm long. 
Blades of midculm elongate; plant villous or velvety (Scoparia). 
SoMa ers PA Gy rem en Gian te De 86. P. SCOPARIUM. 
Spikelets less than 2 mm long________-_ 87. P. VISCIDELLUM. 
Blades of midculm not elongate. 
NodesibeardedsCDichotoma) aye ae oe 68. P. NITIDUM. 
Nodes not bearded. 
Sheaths crisp- or appressed-pubescent (Columbiana). 
a P. WILMINGTONENSE, 
Sheaths glabrous. 
Culms slender, rarely less than 40 cm tall (Dichotoma). 
Spikelets about 1.5 mm long___70. P. CAERULESCENS. 
Spikelets about 2 mm long______- 69. P. ROANOKENSE,. 
