96 NORTH AMERICAN FLORA [VoLuME 17 
1. Trachypogon Montufari (H.B.K.) Nees, Agrost. 
Bras. 342. 1829. 
A as Sea tee Ug sane Kad H.B.K. Nov. Gen. & Sp. 1; 184. 1816. Not A. angustifoltus Sibth. & 
Andropogon Montufari H.B.K. Nov. Gen. & Sp. 1: 184. 1816, 
Andropogon stenophylius R. & S. Syst. Veg. 2: P59. 1817. 
Stems 6-8 dm. tall, rather slender, densely barbed at the nodes, otherwise smooth and 
glabrous ; leaf-sheaths glabrous, or the basal ones sometimes pubescent ; ligule 3-5 mm. 
long; blades erect, usually less than 1 dm. long, 2-3 mm. wide, rough, especially on the 
margins; racemes single, terminating the stem, the pubescent axis 4-5 cm. long; stami- 
nate spikelet about 6 mm. long, pubescent or nearly glabrous, oblong-linear, on a short 
pedicel ; perfect spikelet with a long-hairy callus about 2 mm. long, the first scale about 6 
mim. long, appressed-pubescent, oblong-linear, the awn of the fourth scale 4-5 cm. long, 
the spiral column appressed-pubescent, about as long as the subula which is hispidulous 
and somewhat contorted. 
TYPE LOCALITY: Near Conocoto, Ecuador. 
DISTRIBUTION : Chihuahua to Queretaro, Mexico; also in Ecuador. 
2. Trachypogon Palmeri Nash, sp. nov. 
Stems up to 13 dm. long, barbed at the nodes, otherwise smooth and glabrous; leaf- 
sheaths glabrous; ligule, that of the lower leaves, 1-2 cm. long; blades up to 3 dm. long, 
1-2 mm. wide, rough, involute; raceme single, terminating the stem, the glabrous axis 
6-10 cm. long; staminate spikelet on a short pedicel, 6-8 mm. long, oblong-linear, the first 
scale rather sparingly pubescent or glabrescent ; perfect spikelet with a long-hairy callus 
about 2 mm. long, the first scale about 8 mm. long, hirsute with ascending hairs, the awn 
of the fourth scale 7-8 cm. long, the spiral column appressed-hirsute, a little longer than 
the subula, which is hispidulous and somewhat contorted. 
Type collected at Guadalajara, state of Jalisco, Mexico, July-Oct., 1886, Edward Palmer 467. 
DISTRIBUTION : Known only from the type locality. 
3. Trachypogon plumosus (H. & B.) Nees, Agrost. Bras. 344. 1829. 
Andropogon plumosus H, & B.; Willd. Sp. Pl. 4: 918. 1806. 
Trachypogon mollis Nees, Agrost. Bras. 343. 1829. 
Heteropogon stipotdes Presl, Reliq. Haenk. 1: 335. 1830. 
Heteropogon secundus Presi, Reliq. Haenk. 1: 335. 1830. 
Andropogon stipoides Kunth, Enum. 1: 487. 1833. 
Trachypogon dissolutus Nees, Linnaea 19: 695. 1847, 
Andropogon dactyloides Steud. Syn. Gram. 381. 1855. 
Trachypogon violaceus Anderss. Oefv. Sv. Vet.-Akad. Foérh. 1857: 49. 1857. 
Trachypogon Preslit Anderss. Oefv. Sv. Vet.-Akad. Férh. 1857: 50. 1857. 
Trachypogon dactyloides Fourn. Mex. Pl. Gram, 66. 1881. 
Trachytogon Milieri Fourn. Mex. Pl. Gram. 66. 1881. 
Trachypogon secundus Arechav. Anal. Mus. Nac. Montevideo 3: 270. 1895. 
Stems up to 1.5m. tall, barbed at the nodes, otherwise glabrous; leaf-sheaths glabrous, 
or sometimes pubescent ; ligule up to 3 cm. long; blades flat, or sometimes involute, up to 
4.5 dm. long, 3-8 mm. wide, smooth or rough, glabrous or pubescent ; racemes single, or 
in 2’s or 3’s, terminating the stem, the glabrous axis up to 2 dm. long; staminate spike- 
lets 6-8 or rarely 10 mm. long, the first scale hirsute, oblong to linear or obovate-oblong ; 
perfect spikelets with a long-hairy callus 1.5-2 mm. long, the first scale hirsute, 6-8 mm. 
long, the awn of the fourth scale 4.5-8 cm. long, the spiral column a little longer than the 
hispid or hispidulous subula, shaggy with long hairs. 
TYPE LOCALITY: Cumana, Venezuela. 
DISTRIBUTION : Texas to Arizona, and continental tropical America. 
ILLUSTRATIONS: Bull. U. S. Dep. Agr. Agrost. 20: f. 77; Bull. U.S. Dep. Agr. Bot. 121: p/. 17. 
4, Trachypogon Gouini Fourn. Mex. Pl. Gram. 66. 1881. 
Stems tall, the nodes barbed; leaf-sheaths glabrous; ligule short, truncate; blades 
glabrous, involute; raceme single, terminating the stem, the glabrous axis up to 3 dm. 
long; staminate spikelets with the first scale villous; perfect spikelets, including the long- 
