Parr 2, 1912] POACEAE 125 
Stems up to 1 m. tall, simple, glaucous below the nodes; leaves glaucous; sheaths shorter 
than the internodes, glabrous; blades up to 2.5 dm. long, 4-6 mm. wide, rigid, smooth, glabrous; 
racemes subdigitately arranged in 3’s—5’s, 3-6 cm. long, the internodes of the rachis with the 
terminal hairs a little shorter than themselves; sessile spikelet 5.5-6 mm. long, the first scale 
with the margins involute below, narrowly infolded above, the intercarinal space glabrous, 
shining, 7-nerved, the nerves vanishing below the hyaline apex, sometimes with a pit-like 
depression above, the second scale 3-nerved, the keel and margins ciliate above, the fourth 
scale with a perfect awn 12-15 mm. long, the column straight; pedicellate spikelet equaling 
the sessile one, staminate, the first scale strongly 9-nerved, hispid on the margins above, 
otherwise glabrous. : 
TYPE LOCALITY : New Mexico. 
DISTRIBUTION: New Mexico and Chihuahua. 
ILLUSTRATIONS: Bull. U. S. Dep. Agr. Bot. 121: p1. 21; Bull. U.S. Dep. Agr. Agrost. 17: /. 320, 
3. Amphilophis hirtifolius (J. Presl) Nash. 
Andropogon hirtifolius J. Presl, in Presl, Rel. Haenk. 1: 338. 1830. 
Andropogon pubtfiorus Fourn. Mex. Pl. Gram. 57. 1881. 
Andropogon Schaffneri Griseb.; Fourn. Mex. Pl. Gram. 57. 1881. 
Andropogon hirtifolius pubsflorus Hack. in DC. Monog. Phan. 6: 484. 1889. 
Sorgum hirtifolium Kuntze, Rev. Gen. 792. 1891. 
Stems up to 1 m. tall, simple, erect, or sometimes ascending at the base; leaf-sheaths gla- 
brous, sometimes ciliate on the margins; blades up to 2 dm. long, 3-7 mm. wide, the uppermost 
one very short, rigid, flat, tuberculate-hirsute; racemes lax, subdigitately arranged in 3’s— 
6’s, 3-6 cm. long, the rachis-internodes 3-4 times as long as the terminal hairs; sessile 
spikelet 6-6.5 mm. long, oblong-elliptic, the first scale coriaceous, hispid on the keels, 
the intercarinal space little depressed, 7-nerved, sometimes with « pit-like depression above, 
the second scale chartaceous, 3-nerved, the fourth scale with a stout perfect awn 2-2.5 em. 
long, the dark-purple column straight or curved; pedicellate spikelet staminate, equaling 
or exceeding the sessile one, linear-oblong, the first scale flat, 13-17-nerved, glabrous, excepting 
the hispidulous keels. 
TYPE LOCALITY: Mexico. . 
DISTRIBUTION: Central and southern Mexico. 
4, Amphilophis saccharoides (Sw.) Nash. 
Andropogon saccharoides Sw. Prodr. 26. 1788. 
Andropogon argenteus DC. Cat. Hort. Monsp. 77. 1813. 
Andropogon laguroides DC. Cat. Hort. Monsp: 78. 1813. 
Andropogon barbinodts Lag. Gen. Sp. PI. 3. 1816. 
Andropogon glaucus Torr. Ann. Lyc. N. ¥.1:153. 1824. Not Andropogon glaucus Retz. 1789. 
Andropogon Torreyanus Steud. Nom. ed. 2.1: 93. 1841. 
Andropogon Jamesti Torr. in Marcy, Expl. 302. 1853. 
Andropogon tenuirachis Fourn. Mex. Pl. Gram. 58. 1881. 
Andropogon Kunthit Fourn. Mex. Pl. Gram, 59. 1881. 
Andropogon saccharoides barbinodis Hack. in DC. Monog. Phan. 6: 494, 1889. 
Andropogon saccharoides Torreyanus Hack. in DC. Monog. Phan. 6: 495. 1889. 
Andropogon saccharoides submuticus Vasey; Hack. in DC. Monog. Phan. 6: 495. 1889. Not 
Andropogon submuticus Steud. 1854. 
Andropogon saccharoides laguroides Hack, in DC. Monog. Phan. 6: 495. 1889. 
Sorgum saccharoides Kuntze, Rev. Gen. 792. 1891. 
Amphilophis Torreyanus Nash, in Britton, Man. 71. 1901. 
Amphilophis exaristatus Nash, in Small, Fl. SE. U. S. 65. 1903. 
A green or often glaucous perennial. Stems up to 1 m. tall, simple or branched, the nodes 
glabrous or barbed; leaf-sheaths glabrous, or rarely pubescent; blades up to 2.5 dm. long, 
4-8 mm. wide, flat or convolute, usually rough and glabrous, long-attenuate at the apex; 
panicle oblong-linear, oblong, or oval-oblong, 5—11 cm. long, the racemes numerous, arranged 
on an elongate axis, the rachis-internodes with the terminal hairs 1-3 times their length; 
sessile spikelet 3-4 mm. long, lanceolate or linear-lanceolate, the first scale chartaceous or 
somewhat coriaceous, the margins narrowly infolded above, ciliate on the keels, the intercarinal 
space appressed-pubescent, at least below, 5-7-nerved, flat or slightly depressed, the second 
scale equaling the first, lanceolate, acute, 1-nerved, the fourth scale with a usually perfect 
awn 1-1.5 em. long, or rarely very short and imperfect, very rarely awnless; pedicellate spikelet 
linear or linear-lanceolate, a little shorter than the sessile one, reduced to a single 7-nerved scale. 
