150 NORTH AMERICAN FLORA [VoLumE 17 
Pubescence on the sheaths spreading; racemes commonly more 
than 5. 2. S. villosum. 
Pubescence on the sheaths appressed or nearly so ; racemes com- 
monly less than 4. 3. S. leucocomum. 
Second and third scales glabrous. 
Second scale half as long as the spikelet, rounded or truncate at 
the apex. 4. S. gracillimum. 
Second scale more than half as long as the spikelet, sparingly pilose 
at the acute apex. 5. S. Bakeri, 
mae? of the racemes with the lateral angles winged, thus making itappear 
at, 
Spikelets more than 2mm. long. 
Rachis about 1 mm. wide; leaf-blades glabrous. 6. S. Lschaemum. 
Rachis about 0.5 mm. wide ; leaf- blades hirsute. 7. S. badium. 
Spikelets 1.25-1.5 mm. long 8. S. paniceum. 
Fruiting scale white, yellowish, Or greenish ; first scale usually present, com- 
monly wanting in nos. 9 and 10. 
Rachis of the racemes with the angles wingless ; second scale as longas the 
spikelet. 
Spikelets glabrous. 9. S. Simpsont. 
Spikelets pubescent. 10. S. velutinum., 
Rachis of the racemes with the lateral angles broadly winged ; second scale 
shorter than the spikelet. 
Spikelets about 1.5 mm. long; pedicels terete, glabrous. ll. S. serotinum, 
Spikelets more than 2 mm. long; pedicels 3-angled, the angles 
strongly hispidulous. 
Rachis of the racemes commonly 0.5 mm. wide or less, often bearing 
scattered long hairs; spikelets 1.75-2.5 mm. long 
Rachis of the racemes usually more than 0.7 mm. wide ; spikelets 
more than 2.5 mm. long. 
Spikelets about 2.5 mm. long, rarely up to 3 mm.; third scale with 
rary 
is} 
. S. digitatum, 
the nerves strongly hispid above the middle. 13. S. sanguinale. 
Spikelets commonly 3 mm. long or more; third scale with the 
nerves smooth or nearly so. 14. S. marginatum 
1. Syntherisma filiforme (1,.) Nash, Bull. Torrey Club 
22: 420. 1895. 
Panicum filiforme I,. Sp. Pl. 57. 1753. 
Paspalum filiforme Fligge, Gram. Monog. 139. 1810. 
Digitaria filiformis Mubl. Descr. Gram. 131. 1817. 
Panicum curvinerve Hack. Oesterr, Bot. Zeits. 51: 335. 1901. 
Stems 1.5-7 dm. tall, slender, erect, simple or somewhat branched; leaf-sheaths flattened, 
keeled, at least toward the apex, papillose-hirsute, or the uppermost one glabrous; blades up 
to 2 dm. long, 1-4 mm. wide, flat, erect, usually glabrous on the lower surface, the upper surface, 
as well as the margins, rough, papillose-hirsute at the base; panicle long-exserted, the axis 1-3 
em. long; racemes 2-5, 2-10 cm. long, erect or ascending; spikelets about 1.8 mm. long, elliptic, 
acute, in pairs on hispidulous 3-angled pedicels, the first scale wanting, the second and third 
scales white or purplish, the second 3-nerved, the third 7-nerved, both pubescent with long 
glandular-tipped hairs, the fruiting scale deep chestnut-brown at maturity, striate, obtusely 
apiculate. 
TYPE LOCALITY: North America. 
DISTRIBUTION: New Hampshire to Michigan and Kansas, and south to Florida and Mexico; 
New Providence; Haiti; Cuba. 
ILLUSTRATIONS: Britt. & Brown, Ill. Fl. f. 242; Trin. Ic. pi. 148; Torr. Fl. N. VY. pl. 147; 
Bull. Tenn. Exp. Sta.7: f 28; Field Columb’ Mus. Publ. Bot. 3: 26, f. 
2. Syutherisma villosum Walt. Fl. Car. 77. 1788. 
Digitaria pilosa Michx. Fl. Bor, Am. 1: 45, 1803, 
Digitaria viliosa Pers. Syn. Pl. 1: 85. 1805. 
Paspalum carolinianum Poir. in Lam. Encye. Suppl. 4: 311. 1816. 
Stems densely tufted, 6-14 dm. tall, slender, simple or somewhat branched; leaf-sheaths 
flattened, keeled, at least toward the apex, the lower densely papillose-hirsute, the uppermost 
one sparingly so or glabrous; blades up to 2.5 dm. long, 3-6 mm. wide, flat, erect or nearly so, 
smooth beneath, rough above, the lower papillose-hirsute; panicle long-exserted, the axis 
3-9 cm. long; racemes 2-8, commonly more than 5, 4-20 cm. long, generally 12-15 cm., erect 
or ascending; spikelets 2.5 mm. long, elliptic, acute, on 3-angled sparingly hispidulous pedicels, 
usually in 3’s, the first scale wanting, the second and third scales pubescent with long appressed 
