HITCHCOCK—GRASSES OF CUBA. 215 
Panicle smalland tew-flowered, usually 
about 5 cm. long; blades usually 5 
to& mm. wide................-----.- 12. P. divaricatum. 
Stems herbaceous. 
Fruit transversely rugose. .- weeeeeeee-- 25, P. maximum. 
Fruit smooth. (See continuation 1 ) 
(Continuation 1.) 
Plants forming a rosette of basal leavesin autumn; early culms 
simple, with terminal, exserted, many-flowered, spreading 
panicles; freely branching after maturity of primary panicle, 
and bearing numerous reduced panicles more or less in- 
cluded in the sheaths. (DicHoTOMUM GROUP.) 
Ligule a ring of hairs, 1 mm. or more long; spikelets pu- 
bescent, | to 1.5 mm. long. 
Spikelets hardly 1 mm. long; foliage minutely pubes- 
cent, not velvety...........-.------------------ 48. P. wrightianum. 
Spikelets 1.5 mm. long. 
Foliage smooth or minutely puberulent.. ...--24. P. leucothriz. 
Foliage velvety .......--.---.2.---02---------- 1. P. acuminatum. 
Ligule inconspicuous. 
Autumnal state a flat mat or rosette of soft leaves; 
blades ciliate; spikelets 1.5 to 2mm. long, glabrous. 
Blades pilose on thesurface...........-.-------- 41. P. strigosum. 
Blades glabrous on the surface...................38. P. polycaulon. 
Autumnal state erect or spreading. 
Sheaths velvety or pilose. 
Vernal culms 1 meter or more tall, a viscid 
ring below each node; primary panicles 10 
to 20 cm. long; autumnal blades, 5 mm. 
or more wide.............-.------------ 37. P. scoparium. 
Vernal culms 20 to 40 cm. tall; primary pan- 
icles 2 to 6cm. tongs autumnal blades 1| to 
2mm. wide..............-------------.-- 6. P.chrysopsidifolium. 
Sheaths not velvety 1 nor pilose. 
Culms wiry, minutely crisp-puberulent; 
spikelets pyriform-turgid. 
Spikelets 1.5 mm. long.................31. P. paueciciliatum. 
Spikelets 2 mm. long..................22. P. lancearium. 
Culms glabrous, or only lowermost internodes 
pubescent. 
Spikelets glabrous, 1.6 mm. long....... 7. P. caerulescens. 
Spikelets pubescent. 
Nodes bearded; spikelets 2 mm. 
long 2.22.2... .2.2 0222 eee eee eee 28. P. nitidum. 
Nodes glabrous or pubescent, not 
bearded. 
Blades long and narrow, autum- 
nal bladesinvolute; spikelets 
papillose. 
Spikelets 2mm. long, blunt.27. P. neuranthum. 
Spikelets about 3.5 mm. 
long, pointed........-.- 16. P. fusiforme. 
Blades not elongated, autumnal 
blades flat; spikelets not pap- 
illose. 
