Parr? 2, 1912] POACEAE 121 
spiral column a little exserted; pedicellate spikelet 8-10 mm. long, of. 4 scales, perfect, strongly 
hispidulous, the first scale often short-awned, the hispidulous pedicel less than one half as 
long as the sessile spikelet. 
TYPE LOCALITY: Near Knoxville, Tennessee. 
DISTRIBUTION : Tennessee and Mississippi. 
29. Andropogon Hallii Hack. Sitz.-ber. Akad. Wien 89°: 127. 1884. 
Andropogon Halliit faveolus Hack. Sitz.-ber. Akad. Wien 891: 128. 1884. 
Andropogon Haillit incanescens Hack, Sitz.-ber. Akad. Wien 891: 128. 1884. 
Andropogon Hallit muticus Hack. in DC. Monog. Phan. 6: 444, 1889. 
Sorgum Halli Kuntze, Rev. Gen. 791. 1891. 
Andropogon geminalus Hack.; Beal, Grasses N. Am. 2:55. 1896. 
Andropogon Halitt grandiflorus Scribn. Bull. U. S. Dep. Agr. Agrost. 5: 21. 1897. 
A tall usually glaucous perennial with long stout rootstocks. Stems up to 1.5 m. tall, 
branched; leaf-sheaths glabrous; blades erect, rigid, up to 3 dm. long and 1 em. wide, long-acu- 
minate, smooth, glabrous, or sometimes with a few scattered hairs on the upper surface; racemes 
in 2’s or 3’s, at length exserted from the spathes, 3-8 cm. long, straight, stout, the internodes 
and pedicels densely long-hairy, the hairs white or yellowish; sessile spikelet 8-12 mm. long, 
linear-lanceolate, the first scale hispidulous or long-hairy on the keels, the intercarinal space 
glabrous or appressed-pubescent, the second scale 1-nerved, long-ciliate on the keel, the 
fourth scale lanceolate, 2- toothed, ciliate, awnless, or bearing a glabrous imperfect awn shorter 
than the scale; pedicellate spikelet equaling or larger than the sessile one, lanceolate, the 
first scale long-ciliate or hispid on the keels, usually hispidulous on the back, 5—-9-nerved, the 
second scale equaling the first, 1-nerved, ciliate on the margins and usually on the keel. 
TYPE LOCALITY : Rocky Mountains of Colorado. 
DISTRIBUTION : North Dakota and Wyoming to Texas and Arizona. 
ILLUSTRATIONS : Beal, Grasses Nx Am. 2: f. 14; Bull. U. S. Dep. Agr. Agrost. 17: f. 319; 
Britt. & Brown, Ill. Fl. f. 218 ; Rep. Sec. Agr. 1892: Bot. PLS. 
30. Andropogon paucipilus Nash, in Britton, Man. 70. 1901. 
A glabrous perennial. Stems up to 1 m. tall, sparingly branched above; leaf-sheaths 
shorter than the internodes; ligule scarious, about 3 mm. long; blades erect, firm, usually 
somewhat glaucous, long-acuminate, the lower 2-3 dm. long and 5-7 mm. wide; racemes in 
pairs, 5-8 cm. long, the rachis-internodes less than one half as long as the sessile spikelets, 
glabrous, or the margins with a few long weak crimped hairs; sessile spikelet lanceolate, 
about 1 cm. long, acuminate, the first scale sulcate on the back, the margins infolded, the 
keels hispidulous above, the intercarinal space 2-nerved, the second scale 1-nerved, the fourth 
scale with an imperfect awn less than one half its length; pedicellate spikelet staminate, a 
little smaller than the sessile one, the first scale 9-nerved, not sulcate, the pedicel shorter 
than the sessile spikelet, sparsely pubescent with long weak crimped hairs. 
TYPE LOCALITY : Three miles northeast of Whitman, Grant County, Nebraska. 
DISTRIBUTION: Montana and Nebraska. 
31. Andropogon caricosus L,. Sp. Pl. ed. 2. 1480. 1763. 
Andropogon serraius Retz. Obs. 5:21. 1789. 
Lepeocercis serrata Trin. Fund. Agrost. 203. 1820. 
Sorgum caricosum Kuntze, Rev. Gen. 791. 1891. 
Andropogon annulatus subrepens Hack. Notizbl. Bot. Gart. Berlin 1: 327. 1897. 
Stems 2-6 dm. tall, slender, usually branched above, decumbent and rooting at the base, 
glabrous at the apex; leaf-sheaths compressed, shorter than the internodes, keeled; blades 
up to 12 cm. long, 2-4 mm. wide, smooth béneath, usually pubescent above; racemes solitary, 
sometimes in 2’s or 3’s, 3-5 cm. long, the internodes and pedicels about one third as long as 
the sessile spikelets, ciliate on one margin; perfect sessile spikelet about 3 mm. long, somewhat 
convolute below, the first scale chartaceous-herbaceous, broadly obovate-elliptic, the manifest 
hispid wings ending abruptly below the apex, smooth and shining on the back which is pilose 
below, 8-nerved, the fourth scale bearing an awn 1.5—2 cm. long; pedicellate spikelet equaling 
the sessile one and similar to it, flat, more pubescent, the first scale 15—19-nerved, ciliate on 
the keels. 
TYPE LOCALITY: India. ; : 
DISTRIBUTION : Introduced into Guadeloupe ; a native of the tropics of the Old World. 
ILLUSTRATION : Trin. Ic. pl. 329. 
