Part 1, 1909] POACEAE 95 
16. EREMOCHLOA Biise, in Jungh. Pl. Jungh. 1: 357. 1854. 
Pectinaria Hack. in E. & P. Nat. Pfl. 22: 26. 1887. 
Low perennial grasses, with flat leaf-blades, and solitary compressed 1-sided racemes, 
the rachis of many internodes and somewhat fragile. Spikelets single at the nodes of the 
rachis, the primary or pedicellate one reduced to a mere scale-like pedicel which rarely 
bears a bristle-like rudimentary scale, the secondary or sessile one developed, awnless, 
dorsally compressed, 2-flowered, the lower flower staminate, the upper one perfect, finally 
rather tardily deciduous with the attached rachis-internode ; first scale chartaceous, broad, 
the margins narrowly infolded, 2-keeled, the keels pectinate with spines or rigid hairs; 
second scale 3-keeled ; third scale hyaline, bearing a triandrous flower ; fourth scale entire, 
muticous, enclosing a perfect flower. Stamens 3. Styles short. Stigmas linear, exserted 
below the middle of the spikelet. 
Type species, Evemochloa Horneri Biise. 
1. Eremochloa leersioides (Munro) Hack. in DC. Monog. 
Phan. 6: 264. 1889. 
Ischaemum. leersioides Munro, Proc. Am. Acad. 4: 363. 1860. 
Stems 2-4 dm. tall, erect, slender, simple, hirsute, especially above ; leaf-sheaths hir- 
sute; blades 4-8 cm. long, 2-3 mm. wide, rigid, sometimes folded, hirsute; racemes 2-3 
cm. long, somewhat curved, slender, the internodes about one half as long as the spikelets, 
barbed at the base, pubescent on the back; spikelets 3.5 mm. long, elliptic-oblong, spread- 
ing, the first scale flat or somewhat convolute, the keels pectinate with straight bristles, 
the longer ones about equaling the length of the scale, pilose on the back, the second scale 
pubescent below, the third scale ciliolate at the apex, the fourth scale oblong, glabrous, 
nerveless; primary spikelet wanting, its pedicel present, acuminate, barbed at the base, a 
little longer than the internode to which it is appressed. 
TYPE LOCALITY: Whampoa, China. 
DISTRIBUTION: Collected at San Francisco, California, by Bolander (according to Thurber) ; a 
native of southeastern China. 
17. TRACHYPOGON Nees, Agrost. Bras. 341. 1829. 
Tall, perennial, tufted grasses, with extravaginal innovations, long narrow leaf-blades, 
and terminal racemes, borne singly or digitately. Spikelets 1-flowered, in pairs at each 
node of the continuous rachis, one on a short pedicel, staminate, persistent, dorsally com- 
pressed, the other on a longer pedicel, enclosing a perfect flower, nearly cylindric, decidu- 
ous. Perfect spikelets with the first scale coriaceous, the margins involute and enclosing 
the outer scales; second scale also coriaceous, 3-nerved, furrowed on both sides of the 
thick keel; third scale hyaline; fourth scale hyaline at the base, gradually narrowed into 
a stout perfect awn; stamens 3; stigmas plumose, longer than the styles, exserted from 
the middle of the spikelet. Staminate spikelets with the first scale somewhat thinner, the 
margins narrowly infolded, 7-11-nerved; fourth scale mucronulate or shortly awned at the 
slightly 2-toothed apex; stamens 3; ovary and styles rudimentary. 
Type species, Andropogon Montufari H.B.K. 
Awns exceeding 3 em. long, the hairs on the column equaling in length at least its diameter. 
Leaf-blades flat, or sometimes involute, never terete. 
Awns 3.5-7 cm. long, geniculate, the subula pilose only at the base with long ascending hairs, 
the upper portion hispid or scabrous ; leaf-blades usually flat. 
Hairs on the column of the awn rarely exceeding i in length its diameter, een 
Leaf-blades short ; ligule short, 5 mm. long or less. 1. T. Montufari. 
Leaf-blades long ; ligule long, usually exceeding 1 cm. in length. T. Palmeri. 
Hairs on the column of the awn exceeding in length several times its 
diameter, long and shaggy. 
Awns 10-12 em. long, pilose their entire length with long spreading hairs. 
Leaf-blades terete. 
2. 
3. 7. plumosus. 
4, 
Leaves silky-villous ; spikelets pubescent. 2 T. CANESCENS. 
7. 
T. Gouini. 
Leaves and spikelets glabrous. T. filifolius. 
Awns less than 3 cm. long, the column hirtulous with short appressed hairs, 
shorter in length than its diameter. T. Karwinskyi. 
