POACEAE 73 
in pairs, 6-10 cm. long: spikelets in pairs, 2 mm. long and about 1.5 mm. wide, broadly 
obovate, the first scale 3-nerved, the second one generally 2-nerved by the suppression of the 
midnerve. ` 
In sand, Key West, Florida. Spring to fall. 
13. Paspalum elàtum L. C. Rich. Stems 6-8 dm. tall: leaf-sheaths glabrous ; 
blades 3 dm. long or less, 2-6 mm. wide, densely pubescent with long hairs above at the very 
base, otherwise glabrous: racemes in 3's, 10-13 cm. long: spikelets on hispidulous pedicels, 
elliptic, about 2.2 mm. long and 1.3 mm. wide, the 2 outer scales 3-nerved, the first scale 
pubescent with long appressed hairs, the second one glabrous. 
In sandy soil, Key West, Florida. Also in tropical America. Spring to fall. 
14. Paspalum latifolium Le Conte. Stems tufted, 6-8 dm. tall: leaf-sheaths smooth 
and glabrous, or the basal ones a little pubescent ; blades 1.5-3 dm. long, or the upper- 
most often shorter, 1-2 cm. wide, rather thin, lanceolate to linear-lanceolate, glabrous, or 
some of them occasionally with a few scattered hairs on the margins near the base : racemes 
on the main stem usually in pairs, rarely single, those on the branches single, 6-12 cm. 
long : spikelets in pairs, on shorter puberulent pedicels, about 2 mm. long and 1.5-1.7 mm. 
wide, broadly obovate, the first scale 3-nerved, pubescent with short spreading hairs, the 
second scale 3-nerved, or rarely 5-nerved, glabrous. 
In dry usually shady places, Georgia and Florida. Spring and summer. 
15. Paspalum gracílimum Nash. Stems slender, 4-6 dm. tall: leaf-sheaths smooth 
and glabrous : blades (the upper ones) 1.5 dm. long or less, 2-7 mm. wide, flat, a ring of 
long hairs just above the ligule, otherwise glabrous : racemes 6-10, usually alternate, 
widely spreading, slender, 3-7 cm. long: spikelets in pairs, obovate, 1.4 mm. long and 0.9 
mm. wide, the 2 outer scales 3-nerved, the first scale pubescent with short glandular-tipped 
hairs, the second scale glabrous, the third scale about 4 as thick as broad. 
Insandy soil, Key West, Florida. Spring to fall. 
16. Paspalum pubéscens Muhl. Stems tufted, 4-8 dm. tall, long-hirsute below the 
racemes: leaf-sheaths glabrous, or sometimes pubescent on the margins or toward the apex, 
the basal ones sometimes pubescent all over ; blades 4-23 cm. long, 3-6 mm. wide, rarely 
broader, densely pubescent on both surfaces with long spreading rather stiff hairs arising 
from papillae, if ciliate on the margins the hairs short: racemes usually 1, rarely 2 on the 
main stem, generally straight, or sometimes a little curved, 6-12 cm. long, rarely shorter : 
spikelets in pairs, glabrous, on shorter puberulent pedicels, about 2 mm. long and 1.5-1.8 
mm. wide, broadly obovate, the 2 outer scales 3-nerved, or the second 2-nerved by the sup- 
pression of the midnerve, the flowering scale triangular in cross-section, the angles rounded, 
about two-thirds as thick as broad. 
In fields, New York and New Jersey to Pennsylvania, District of Columbia and Tennessee. Sum- 
mer and fall. 
17. Paspalum Muhlenbérgii Nash. Stems tufted, at first erect, finally reclining, 
4-8 dm. tall, smooth and glabrous: leaf-sheaths generally pubescent all over with long 
hairs or sometimes only on the margins ; blades 0.5-2 dm. long, rarely longer, usually 
7-11 mm. wide, or sometimes narrower, ciliate on the margins with usually long hairs, 
more or less pubescent on both surfaces with long hairs: racemes in 1’s or 2’s, straight or 
curved, 5-10 cm. long: spikelets in pairs, glabrous, on shorter puberulent pedicels, about 
2mm. long and 1.8 mm. wide, oval or broadly obovate, the 2 outer scales 3-nerved, or the 
second rarely 2-nerved by the suppression of the midnerve, the flowering scale triangular 
in cross-section, the angles rounded, about à as thick as broad. 
In fields or in sandy or stony ground, Massachusetts to Missouri and the Indian Territory, South 
Carolina, Georgia and Mississippi. Late summer and fall. 
18. Paspalum setaceum Michx. Stems tufted, slender, 2-7 dm. tall: basal leaf- 
sheaths densely pubescent with long hairs, the upper ones only on the margins ; blades 
3-14 cm. long, rarely somewhat longer, usually 2.5-5 mm. wide, sometimes a little 
broader, linear, strict and erect or ascending, densely pubescent on both surfaces with long 
hairs: racemes single, slender, 4-8 cm. long, sometimes a little longer: spikelets either - 
single or in pairs, on shorter puberulent pedicels, about 1.5 mm. long and about 1.3 mm. 
wide, broadly obovate, the first scale 3-nerved,* pubescent with spreading glandular-tipped 
hairs, the second scale 2-nerved, the midnerve rarely, if ever, present, glabrous or occasion- 
ally pubescent. oe 
In dry sandy soil, southeastern New York to Florida, west to Mississippi. Summer and fall. 
19. Paspalum villosissimum Nash. Plant yellowish gray-green. Stems tufted, 
erect, 4-10 dm. tall: leaf-sheaths crowded at the base of the stem, very densely pubescent, 
as well as both surfaces of the blades, with very long white spreading hairs; blades erect 
or ascending, thick, lanceolate, 2 dm. long or less, 6-10 mm. broad : racemes single or in 
