40 



ANDROPOGON LINNAEANTJS (Hack.) Scribn. & Kearney, n. comb. {Sor- 

 (jhiun iiuldiis Luiiiiu'diiuiji Hack, in Mart. Fl. Bras. 2^: 276 (1878); Andropogon 

 rmUois Linnaeanus Hack, in DC. Monog. Phan. 6: 531 (1889).) 

 ANDROPOGON MISSISSIPPIENSIS sp. nov. (Fig. 15.) 



A rather sn)all perennial, 4 to 7 dm. high, with few, short-peduncled spikes. Culms 

 slender, smooth, purplish where exposed, the lower internodes somewhat com- 

 pressed; sheaths about one-half as long as the internodes, strongly striate, 

 densely hirsute or papillose-hirsute with white hairs 2 to 3 mm. long, the lower 

 oneseqtiitant, crowded; lignle a very short membranous ring; leaf-blades 1 to 2.5 



dm. long, 2 to 3 mm. wide, acu- 

 minate, flat, hirsute below, papil- 

 lose-hirsute above, midrib and 

 margins strongly scabrous. Pani- 

 cle 2 to 2.5 dm. long, slender, in- 

 terrupted, nearly simple ; branches 

 7 to 15 cm. long, appressed, single, 

 2-noded. Spathe 4 to 4.5 cm. 

 long, equaling or shorterthanthe 

 racemes, abruptly acuminate into 

 an awn 2 to 3 mm. long. Ra- 

 cemes in pairs, 2 to 4 cm. long, 

 6 to 1 2 flowered ; internodes some- 

 what clavate, shorter than the 

 spikelets, 2.5 mm. long, densely 

 clothed with long, white, silky 

 hairs, 5 to 7 mm. long; sessile 

 spikelet yellowish, linear-lance- 

 olate, 4 mm. long; callus barbate 

 with hairs 3 mm. long; first glume 

 hispid-scabrous on the flat or de- 

 pressed back and on the keels, 

 especially toward the apex, nerv'e- 

 less between the keels, 3.5 to 4 

 mm. long, 1 to 1.2 mm. broad; 

 second glume firm, strongly com- 

 pressed, keeled, .scabrous on the 

 keel, hirsute on the margins, 3.5 

 mm. long, bidentate at the acute 

 apex; third and fourth glumes 

 hyaline, acuminate, the fourth 

 Ijearing an erect, slender awn, 

 twisted at the base, 1.5 to 2 cm. 

 long; sterile pedicel 4 mm. long, 

 slender, densely clothed with long, white, silky hairs; sterile spikelet reduced 

 to a single scale 2 to 3 nun. long. 

 Related to A. argyricus, but easily separated by the hirsute sheaths and leaves, the 

 narrow, simpler, interrupted i)anicle, and broader, scabrous first glume. Distin- 

 guished from A. cdbdnisii by its hirsuteness and by the nerveless intercarinal 

 space of the first glume. 

 Type collected at Biloxi, Mississippi, 3818 S. M. Tracy, October 14, 1897. No. 3817 



S. ]\I. Tracy also bclDUgs here. 

 ANDROPOGON SCOPARIUS POLYCLADUS var. nov. 



Stout, 9 to 12 dm. high, glabrous, somewhat glaucous; panicles large, much branched, 

 3 to 5 dm. long. 



Fig. li.—Andwpo<joii hakcri Scribn. & Ball: a, a spikelet 

 and joint of the axi.s: b, first glume; e, second glume; 

 d, third glume; e, awned fourth glume; /, pistil and 

 lodicules. 



