POACEAE 79 



glabrous ; blades commonly 2 dm. long or less, 5-12 mm. wide : spikes 4-13 cm. long, 

 usually a pair at the summit of the stem, sometimes with an additional one a short distance 

 below: spikelets 4-6 mm. long. [Faspalumfurcatum Fluegge.] 



In dry sandy soil, Virginia to Florida, Arkansas and Texas. Spring to fall. 



2. Anastrophus platycaulia ( 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 conipr6ssus (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 additional 

 third one below, slender, 4-10 cm. long : spikelets about 2 mm. long, elliptic, pubescent. 



In dry sandy soil, Virginia to Florida and Texas. Also in 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 or a 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. rvfa. 



Leaf-blades narrowed toward the summit, the lower ones 5-10 mm. wide : plant green. 2. A. villosa. 



1. Anthaenantia rufa (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, 

 5-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 villosa (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 aerial 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. 



Stems not from rootstocks : leaf-blades papillose-hispid. 1. A. Amphicarpon. 



Stems from long running rootstocks : leaf-blades glabrous. 2. A. Floridanum. 



1. Amphicarpon Amphicarpon (Pursh) Nash. Stems tufted, the aerial 3-8 dm. 

 tall, naked above and bearing a terminal 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. 



