﻿New or noteworthy American Grasses.— VIII. 



By George V. Nash. 



Andropogon Neo-Mexicanus sp. nov. 



* 



Culms from a perennial root, tufted, .erect, smooth, glabrous 

 and shining, branched above, I metre or less tall, the sterile shoots 

 about one-quarter as Ions as the culms. Sheaths somewhat com- 

 pressed, roughish, keeled, at least at the summit, shorter than the 

 internodes ; ligule scarious ; leaves erect, rough on both surfaces, 

 8-15 cm. long, 3 mm. or less wide; racemes single, 4-5 cm. 

 long, on long peduncles ; internodes of the rachis from one-half 

 to two-thirds as long as the spikelets, densely pilose on the angles 

 with ascending white silky hairs, increasing in length toward the 

 top, those at the apex 3-4 cm. long; spikelets in pairs, one pedi- 

 cellate and consisting of a single subulate rough short-awned scale 

 5-6 mm. long, the pedicel about two-thirds as long as the sessile 

 spikelet, clavellate, flattened, densely ciliate on the margins with 

 long white silky ascending hairs; sessile spikelet perfect, a ring of 

 short silky hairs at the base, the outer 2 scales lanceolate, acumi- 

 nate, equal, glabrous, 8-9 mm. long, the third and fourth scales 

 shorter, hyaline, delicate, cilicate on the margins, the latter deeply 

 and acuminately 2-toothed for about one-third its length and bear- 

 ing a rough geniculate awn 12-15 mm. long, spiral at the base 



and loosely twisted above. 



Collected by Mr. E. O. Wooton on the White Sands, Dona 

 Ana Co., New Mexico, on August 26, 1897. It belongs to the 

 section Schkachjrwm, and is related to A. scoparius. The profuse 

 white silky longer hairs of the rachis internodes and of the pedi- 

 cels, giving the racemes much the appearance of young specimens 

 of A. argymcus, furnish the most prominent diagnostic character. 



Panicum Addisonii sp. hov. 



Culms 2.5-4 dm. tall, tufted, erect or decumbent at the base, at 

 length much branched, pubescent below with long nearly ap- 

 pressed hairs which decrease in length toward the summit where 

 they are very short ; sheaths usually shorter than the internodes, 

 sparingly appressed-pubescent, at least the lower ones ; ligule a 

 ring of hairs ; leaves erect, lanceolate, thickish, smooth and gla- 

 brous on both surfaces, rough on the margins, acuminate, 2.5-8 

 cm. long, 3-6 mm. wide ; panicle ovate to oblong, 2-6 cm. long, 

 its branches spreading or ascending ; spikelets broadly obovate, 2 



