POACEAE 79 
glabrous ; blades commonly 2 dm. long or less, 5-12 mm. wide: spikes 4-13 em. long, 
usually a pair at the summit of the stem, sometimes with an additional one a short distance 
below: spikelets 4-6 mm. long. [Paspalum furcatum Fluegge. ] 
In dry sandy soil, Virginia to Florida, Arkansas and Texas. Spring to fall. 
2. Anastrophus platycatlis (Poir.) Nash. Stolons stout and creeping. Stems 
flattened, 2-4 dm. tall: leaves glabrous or pubescent ; sheaths compressed ; blades 1.5 dm. 
long or less, 8-12 mm. wide: spikes a pair, or sometimes with an additional one below: 
spikelets about 2.25 mm. long, ovate, very acute, pubescent. 
In dry sandy soil, Florida. Summer and fall. 
3. Anastrophus compréssus (Sw.) Schlecht. Stolons numerous and creeping, 
Stems 3-8 dm. tall, slender, flattened : leaves glabrous ; sheaths compressed ; blades some- 
times 3 dm. long, usually shorter, 4-8 mm. wide: spikes in pairs, or with an additiona] 
third one below, slender, 4-10 cm. long: spikelets about 2 mm. long, elliptic, pubescent, 
In dry sandy soil, Virginia to Florida and Texas. Alsoin tropical America. Summer and fall. 
23. ANTHAENANTIA Beauv. 
Erect perennial grasses, with numerous spikelets arranged in a narrow or contracted 
panicle. Spikelets 1-2-flowered, ovate, sometimes shortly acuminate. Scales 3, the 2 
outer equal, or nearly so, membranous, densely silky-pilose externally, empty, or the 
second one enclosing a palet and sometimes also a staminate flower, the third scale equal- 
ling ora little shorter than the second, membranous, finally somewhat rigid or slightly in- 
durated, enclosing a shorter palet and a perfect flower. Stamens 3. Styles distinct. Stig- 
mas penicillate-plumose. 
Leaf-blades linear, the lower ones 3-4 mm. wide: plant often purple or purplish. '1. A. rufa. 
Leaf-blades narrowed toward the summit, the lower ones 5-10 mm. wide: plant green. 2. A. villosa. 
1. Anthaenantia rüfa (Ell.) Schult. Smooth and glabrous, often purple. Stems 
4-10 dm. tall, from a running rootstock : leaf-sheaths shorter than the internodes ; blades 
erect, linear, obtuse, 2-5 mm. wide, those at the base and on the innovations 2-4 dm. long, 
those on the stem 2 dm. long or less: panicle contracted, 8-20 cm. long, 1-2 cm. broad : 
Spikelets numerous, 3.5-4 mm. long, the first and second scales about equal in length, 
9-nerved, the hairs about 1 mm. long, the second enclosing a palet and often also a stami- 
nate flower, the third scale as long as or a little shorter than the others. 
In moist pine lands, South Carolina to'Florida. Fall.—A form, A.rufa scdbra Nash, differing from 
the above in having the sheaths and blades scabrous, occurs in similar situations in South Carolina, 
but mainly from Alabama to Louisiana. Fall. 
2. Anthaenantia villdsa (Michx.) Beauv. Smooth and glabrous, green. Stems 
5-15 dm. tall, from a running rootstock : leaf-sheaths shorter than the internodes ; blades 
erect, narrowed toward the apex, acute or somewhat obtuse, 3 dm. long or less, 1 cm. wide 
or less: panicle contracted, 8-20 cm. long, 1-2 cm. broad: spikelets 3-4 mm. long, the 
2 outer scales 5-nerved, the hairs about 0.6 mm. long, the first scale equalling or a little 
shorter than the second which encloses a palet and sometimes also a staminate flower, the 
third scale about equalling the second. 
In dry pine lands, South Carolina to Florida and Texas. Summer and fall. 
24. AMPHICARPON Raf. 
Tufted grasses, with flat leaf-blades and 1-flowered spikelets of two kinds; one borne 
in terminal panicles, articulated below the empty scales and readily deciduous, lanceolate, 
not ripening fruit; the other solitary, larger, becoming ovoid and turgid, terminating 
subterranean stems, and maturing fruit. Scales 3, the third subtending a palet and perfect 
flower; the scales of the aérial spikelets green, membranous ; those of the subterranean 
spikelets much firmer in texture, white or yellowish, becoming indurated and enclosing 
the grain. Stamens 3. Styles distinct. Stigmas penicillate-plumose. 
1. A. Amphicarpon. 
Stems not from rootstocks : leaf-blades papillose-hispid. j 
Stems from long running rootstocks : leaf-blades glabrous. 2. A. Floridanum. 
1. Am on Amphicárpon (Pursh) Nash. Stems tufted, the aérial 3-8 dm. 
tall, naked ea buius a EI contracted panicle 3-20 cm. long, the spikelets 
numerous, elliptic, 4-5 mm. long; subterranean stems slender, 1.5-10 cm. long, bracted at 
the base, with a single terminal spikelet : leaf-sheaths and blades papillose-hispid with 
spreading hairs, the latter erect, 15 cm. long or less, 1.5 cm. wide or less, lanceolate. [A. 
Purshii Kunth. ] 
In sandy soil, New Jersey to Georgia (according to Chapman). Fall. 
