Part 1, 1909] POACEAH 97 
hairy callus, 9mm. long, the first scale villous, the awn of the fourth scale 10-12 cm. long, 
long-hairy from base to apex, the column flexuous. 
TYPE LOCALITY: Vera Cruz, Mexico. 
DISTRIBUTION: Vera Cruz; Cuba. 
5. Trachypogon canescens Nees, Agrost. Bras. 343. 1829. 
Andropogon canescens Kunth, Enum. 1: 487. 1833. 
Whole plant silky-villous. Stems up to 1 m. tall, sometimes glabrous; leaf-blades 
terete, channeled on the upper surface, up to 5 dm. long, about 1 mm. in diameter; ligule 
2-4 mm. long; raceme single, terminating the stem, the pilose or glabrous axis 1-1.5 dm. 
long; staminate spikelet linear-oblong, about 7 mm. long, the first scale pilose with long 
hairs, the fourth scale sometimes bearing a short exserted straight awn; perfect spikelet 
with a barbed callus about 3 mm. long, the first scale silky-villous, about 8 mm. long, the 
awn of the fourth scale 3-5 cm. long, the column and sometimes the base of the subula 
hirsute with long ascending hairs, the remainder of the awn hispidulous. 
TYPE LOCALITY: Southern Brazil. 
DISTRIBUTION : Mexico and (according to Fournier) Nicaragua ; also in Brazil. 
6. Trachypogon filifolius (Hack.) Hitche. Contr. U. S. Nat. 
Herb. 12: 191. 1909. 
Trachypogon polymorphus filifolius Hack. in Mart. Fl. Bras. 23: 264. 1883. 
‘Stems up to 12 dm. tall, barbed at the nodes, otherwise glabrous; leaf-sheaths smooth 
and glabrous; ligule 2-5 mm. long; blades terete, smooth and glabrous, up to 3 dm. long, 
1mm. in diameter or Jess; raceme single, terminating the stem, the glabrous axis 1-2 
dm. long; staminate spikelets about 6 mm. long, the first scale linear, glabrous, except at 
the ciliate apex ; perfect spikelets with a long-hairy callus 2-3 mm. long, the first scale 
glabrous, except at the ciliate apex, linear, about 7 mm. long, the awn of the fourth scale 
3-5 cm. long, the spiral column hirsute. with long ascending hairs, about twice the length 
of the hispidulons subula. 
TYPE LOCALITY: Caxoeira, Minas Garaes, Brazil. 
DISTRIBUTION: Cuba; also in Brazil. 
ILLUSTRATION: Mart. Fl. Bras. 23: pl. 62, f. 1. 
7. Trachypogon Karwinskyi (Hack.) Nash, sp. nov. 
Trachypogon polymorphus Karwinskyi Hack. in DC. Monog. Phan. 6: 329. 1889. 
Leaves unknown ; racemes in 3’s, terminating the stem, the puberulent axis 10-12 cm. 
long ; staminate spikelets 6 mm. long, linear-oblong, very densely appressed-pilose ; per- 
fect spikelets 9 mm. long, linear-oblong, densely appressed-pilose, the awn of the fourth 
scale 2-2.5 cm. long, the column shortly appressed-hirtulous, the hairs shorter than the 
diameter of the column, the subula about equaling the column in length. 
TYPE LOCALITY: Mexico. 
DISTRIBUTION : Known only from the type locality. 
18. ELYONURUS H. & B.; Willd. Sp. Pl. 4: 941. 1806. 
Elionurus Kunth, Mém. Mus, Paris 2: 69. 1815. 
Tall and branched, or low and tufted, grasses, with often elongate leaf-blades, and 
terminal racemes. Spikelets in pairs in excavations at the rachis-nodes, one sessile, 1- 
flowered, or rarely 2-flowered, the other pedicellate and sometimes enclosing a flower. 
Scales 4, awnless; outermost scale larger than the rest, membranous, exhaling a balsamic 
odor when fresh or when soaked in water ; second scale shorter, thinner, somewhat rigid, 
acute; third scale empty, or rarely in the sessile spikelet enfolding a staminate flower ; fourth 
scale very thinly hyaline, in the sessile spikelet enclosing a perfect flower, in the pedi- 
cellate spikelet either empty or enclosing a staminate flower ; palet minute or wanting. 
Stamens 3. Styles distinct. Stigmas plumose. 
Type species, Elyonurus tripsacoides H. & B. 
