Sand Bluestem

Andropogon hallii Hack. Sitz.-ber. Akad. Wien 89' : 127. 1884
Andropogon Hallii Jlaveolus Hack. Sitz.-ber. Akad. Wien Spi : 128. 1884.
Andropogon Hallii incanescens Hack. Sitz.-ber. Akad. Wien 89i : 128. 1884.
Andropogon Hallii muHcus Hack, in DC. Monog. Phan. 6 : 444. 1889.
Sorgum Hallii Kuntze, Rev. Gen. 791. 1891.
Andropogon geminatus Hack.; Beal, Grasses N. Am. 2 : 55. 1896.
Andropogon Hallii grandijlorus 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 cm. wide, long-acuminate, 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-ciUate 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, l-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.

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 l-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.