POACEAE 135 



the fifth scale, when present, empty, similar in texture to the fourth. Stamens 3. Styles 



distinct. Stigmas plumose. 



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



a mere dorsal projection. 

 Spikes usually 4-6, 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. glauca. 

 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 4-6 : third scale of the spikelet less than 3 mm. long. 4. E. neglecta. 



1. Eustachys petra&a (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, the awn about 0.5 mm. long ; 

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

 about 0.3 mm. long, the awn short or wanting ; fourth scale 1.3-1.5 mm. long, in side view 

 obovate-elliptic, 0.5-0.7 mm. 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 Chapm. Stems 6-15 dm. tall : leaf-blades 2.5 dm. long or less, 

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

 (5-15 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 toothed 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, obtuse 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. [Chloris 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 mm. 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 Floridana (Chapm.) Vasey.] 



In dry sandy soil, southern Georgia and northern Florida. Summer. 



4. Eustachys neg!6cta 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 the apex, the lobes obtuse and minutely and irregularly toothed, 

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

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

 side view obovate-elliptic, about 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 Fourn. 



Tall grasses, with flat leaf -blades and usually numerous 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 rachilla extending beyond the flowers as 

 a scale-bearing appendage. Scales usually 3, sometimes more, the 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 equal or the lateral 

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

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



1. Trlchloris 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, about 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. GYMNOFOGON 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 



