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 em. 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 petraéa (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 glaüca Chapm. Stems6-15 dm. tall: leaf-blades 2.5 dm. long or less, 
1.5 em. wide or less, smooth : axis of the inflorescence 2.5 em. long or less: spikes 10-25, 
6-15 em. 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 cy press swamps, Florida. Summer. 
3. Eustachys Floridàna 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 em. 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 elliptie 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 neglécta 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. 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, 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. 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 
