POACEAE 135 



the fifth scale, when present, empty, siniihir in texture to the fourtii. Stamens 3. Styles 

 distinct. Stigmas plumose. 



Spikelets 2 mm. long: third and fourtli scales awnless, or the former sometimes with 

 a mere dorsal projection. 

 Spikes usually -1-6. rarely more: second scale of the'spikelet manifestly 2-toothed 



at the apex : leaf-blades usually 3-7 mm. wide. 1. E. petraea. 



Spikes 10-25 : second scale of the spikelet truncate at the apex : leaf-blades usu- 

 ally 1 cm. wide or more. 2. E. glmica. 

 Spikelets 3 mm. long or more : third and fourth scales awned. 



Spikes usually 1 or 2, rarely 3 : third scale of the spikelet over 3 mm. long. 3. E. Floridana. 



Spikes 4-0 : tliird scale of the spikelet less than 3 mm. long. 4. E. ncglccta. 



1. Eustachys petrada (Sw. ) Desv. Stems 3-11 dm. tall : leaf-blades 3 dm. long or 

 less, 10 mm. wide or less, smooth : spikes 3-11, usually 4-6, erect, 4-11 cm. long: spike- 

 lets about 2 mm. long: scales 4, the second, exclusive of the awn, 1.5-1.75 mm. long, 

 2-toothed at the apex, the teeth triangular, acute or obtusish, tlie awn about 0.5 mm. long ; 



"third scale about 2 nun. long, in side view elliptic and about 1 mm. wide, the nerve-hairs 

 about 0.3 ram. long, the awn short or wanting ; fourtli scale 1.3-1.5 nun. long, in side view 

 obovate-elliptic, 0.5-0.7 nnn. wide, rounded at the apex, awnless. [Chloris petraea Sw.'] 



In dry sandy soil, usually along the coast, North Carolina to Florida and Texas. Also in tropical 

 America. In Florida it occurs in the heart of the peninsula, 50 miles from the coast. Summer. 



2. Eustachys glauca C'luipm. Stems 6-15 dm. tall : leaf -blades 2.5 dm. long or les.s, 

 1.5 cm. wide or less, smooth : axis of the inflorescence 2.5 cm. long or less : spikes 10-25, 

 6-15 cm. long: spikelets about 2 mm. long: scales 4 ; second scale, exclusive of the awn, 

 1.5 mm. long, in side view about 0.3 mm. wide, minutely and irregularly tootlied at the 

 truncate apex, the awn about 0.3 mm. long ; third scale 1.75-2 mm. long, in side view 

 ovate and 0.8-0.9 mm. wide, ol)tuse at the awnless apex, the nerves hispid above the 

 middle; fourth scale about 1.3 mm. long, in side view oblong and about 0.5 mm. wide, 

 rounded-truncate at the awnless apex. {^Cldoris glauca (Chapm. ) Vasey. ] 



In brackish marshes and about cypress swamps, Florida. Summer. 



3. Eustachys Floridana Chapm. Stems 4-10 dm. tall : leaf-blades smooth, the 

 early basal ones 1-3 dm. long, 4-8 mm. wide, those on the stem 2-7 cm. long, 5 mm. wide 

 or less : spikes 1-3, erect, 5-10 cm. long : spikelets, exclusive of the awns, 3-3.5 mm. long : 

 scales 4, the second about 2.5 nun. long, exclusive of the awn, unequally 2-lobed at the 

 apex, the lobes rounded and minutely and irregularly toothed, the awn 0.7-1 mm. long ; 

 third scale 3-3.5 mm. long, in side view elliptic and 1-1.2 mm. wide, the nerve-hairs about 

 0.5 mm. long, the awn 0.5-0.7 mm. long ; fourth scale smaller, the awn less than 0.5 mm. 

 long. [Chloris Floridunn (Chapm.) Vasey.] 



In dry sandy soil, southern (ieorgia and northern Florida. Summer. 



4. Eustachys negl^cta Nash. Stems 7-12 dm. tall : leaf-blades 2 dm. long or 

 less, 9 mm. wide or less, smooth : spikes 4-6, erect, 8-15 cm. long : spikelets, exclusive of 

 the awns, about 3 mm. long : scales 4, rarely 5 ; second scale, exclusive of the awn, about 

 2.5 mm. long, 2-lobed at tlie a.\iex, tlie lobes obtuse and minutely and irregularly toothed, 

 the awn about 1 mm. long ; third scale 2.5-2.8 nun. long, in side view about 1 mm. wide, 

 the nerve-hairs about 0.7 mm. h)ng, the awn 1 mm. long ; fourth scale 1.5-2 nun. long, in 

 side view obovate-elliptic, al)out 0.75 mm. wide, the awn less than 1 mm. long; fifth scale 

 smaller. 



In dry sandy soil, eastern and peninsular Florida. Summer. 



80. TRICHLORIS Foufn. 



Tall grasses, with flat leaf-blades and usually luuuerous slender spikes which are closely 

 approximate or subverticillate. Spikelets sessile, densely crowded in 2 rows on one side of 

 the continuous rachis, 1-, rarely 2-3-flowered, the racliilla extending beyond the flowers as 

 a scale-bearing appendage. Scales usually 3, sometimes more, tlie 2 outer empty, small, 

 persistent, membranous, the first usually very narrow, acute, awnless, the second short. 

 awned, the flowering scale or scales 3-awned, the awns long and nearly ecjual or the lateral 

 much shorter, the remaining scales empty or sometimes reduced to mere awns ; palet hya- 

 line, 2-keeled near the mai-gins. Stamens 3. Styles distinct. Stigmas plumose. 



1. Trichloris pluriflora Fourn. Stems erect, 4-12 dm. tall : leaf-blades flat, 3 dm. 

 long or less, 5-10 mm. wide : spikes 5 or more, 5-15 cm. long, slender : spikelets, exclu- 

 sive of the awns, al)out 4 mm. long, the awn of the flowering scales 2-3 times their length. 



In dry soil, central and western Texas. Also in Mexico. Spring and summer. 



81. GYMNOPOGON Beauv. 

 Usually perennial grasses, with flat, generally short, rarely long, leaf-blades and an in- 

 florescence composed of numerous long slender spikes which are alternately arranged or 



