126 NORTH AMERICAN FLORA [VoruME 17 
TYPE LOCALITY : Jamaica. 
DISTRIBUTION: Missouri to Colorado, south to Texas and Arizona, Mexico, and Central 
America ; Jamaica; also in northern South America. 
ILLUSTRATIONS : Jacq. f. Ecl. Gram. o/.5,; Bull. U. S. Dep. Agr. Bot. 121: £1. 20; Britt. &. 
Brown, Ill. Fl. f 223; Bull. U. S. Dep. Agr. Agrost. 7:1 8. 
5. Amphilophis leucopogon (Nees) Nash. 
Andropogon leucopogon Nees, Linnaea 19: 694. 1847. 
? Eulalia mexicana Steud. Syn. Gram. 412. 1855. 
Andropogon saccharoides leucopogon Hack. in DC. Monog. Phan. 6: 496. 1889. 
Andropogon saccharoides leucopogon paucirameus Hack. in DC. Monog. Phan. 6: 497. 1889. 
Amphilophis barbinodis Nash, in Small, Fl. SE. U. S. 65. 1903. 
Stems tufted, stout, 5-10 dm. tall, simple or branched, the nodes densely barbed; leaf- 
sheaths smooth and glabrous; blades up to 3 dm. long, 2-8 mm. wide, rough, firm, glabrous; 
panicle broadly oblong, ovate, oval, or obovate, 5-12 cm. long; racemes 6—-many, arranged 
subdigitately or somewhat flabellately on a short axis, the longer ones 4-6 cm. long, the lower 
usually equaling or exceeding one half the length of the panicle, the rachis-internodes with the 
terminal hairs about as long as the spikelets; sessile spikelet 5-6 mm. long, about one half 
as long again as the internodes, the awn perfect, 2-3 cm. long, the column much exserted; 
pedicellate spikelet of a single awnless scale 4-5 mm. long. 
TYPE LOCALITY: Mexico. : 
DISTRIBUTION : Western Texas to southern California and in northern and central Mexico ; 
also a slender form in Cuba, Haiti, and Colombia. 
6. Amphilophis emersus (Fourn.) Nash. 
Andropogon emersus Fourn. Mex. Pl. Gram. 58. 1881. 
Andropogon perforatus Trin.; Fourn. Mex. Pl.Gram. 59. 1881. 
Amphilophis perforatus Nash, in Small, Fl. SE. U. S. 66. 1903. 
Stems tufted, rather stout, 5-10 dm. tall, the nodes barbed; leaf-sheaths smooth and 
glabrous; blades 2 dm. long or less, 2-4 mm. wide, the upper surface sometimes pubescent with 
long hairs near the base; panicle 5-10 cm. long, subflabellate; racemes 5-8, 5-6 cm. long, 
the rachis-internodes with the terminal hairs about as long as the internodes; sessile spikelet 
5-5.5 mm. long, rarely 4 mm., the first scale lightly sulcate on the back and with a deep pit- 
like depression above the middle, the fourth scale with a geniculate awn 2-2.5 cm. long, the 
column mitch exserted; pedicellate spikelet of a single awnless scale about 3 mm. long. 
TYPE LOCALITY: Orizaba, Vera Cruz. : 
DISTRIBUTION: Western Texas and Mexico. 
7. Amphilophis Palmeri (Hack.) Nash, sp. nov. 
? Andropogon hirsutus H.B.K. Nov. Gen. & Sp. 1: 186, 1816. 
Andropogon saccharoides leucopogon Paimeri Hack. in DC. Monog. Phan. 6: 496. 1889. 
Stems up to 8 dm. tall, the nodes densely barbed; leaf-sheaths densely hirsute toward.the. 
apex, otherwise glabrous or sparingly hirsute; blades 2 dm. long or less, 3-6 mm. wide, densely 
hirsute on both surfaces; panicle flabellate, 5-6 cm. long, the rachis-internodes of the racemes 
with the terminal hairs about one half as long as the sessile spikelets; sessile spikelet 5.5-6.5 
mm. long, the first scale slightly sulcate on the back and with a deep pit-like depression above 
the middle, the fourth scale with a geniculate awn 2-2.5 cm. long, the column much 
exserted; pedicellate spikelet of a single linear acute scale 4-5 mm, long. 
TYPE LOCALITY: Rio Blanco, near Guadalajara, Jalisco. 
DISTRIBUTION: Known only from the type locality. 
8. Amphilophis Schlumbergeri (Fourn.) Nash. 
Andropogon Schlumbergeri Fourn. Mex. Pl. Gram. 59. 1881. 
? Andropogon Schlumbergerit Andreae Hack. in DC. Monog. Phan. 6: 498. 1889. 
Sorgum Schlumbergeri Kuntze, Rev. Gen. 792. 1891. 
Stems up to 12 dm. tall, stout, densely barbed at the nodes; leaf-sheaths smooth and 
glabrous; blades up to 3 dm. long, 3-8 mm. wide, long-attenuate at the apex, sparingly tubercu- 
late-hispid; panicle 10-12 cm. long; racemes 5-6 cm. long, arranged in a subdigitate manner, 
the rachis-internodes with the terminal hairs usually not exceeding one quarter the length of 
the sessile spikelets; sessile spikelet 5-6 mm. long, the first scale coriaceous-chartaceous, 
