394 



CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



HERBARIUM SPECIMENS. 



Arizona: Hitchcock 3685, Patagonia; 3480, Tucson; 3733, Benson. Griffiths 1556, 

 Fort Lowell; 3361, near Tucson; 3402, Santa Rita Forest Reserve; 1785, Rincon 

 Mountains. Meatus 1026, 1064, and 856£, south of Bisbee. Griffiths & Thornber 

 199 and 9, Santa Rita Mountains. Pur-pus 94, Antelope. Pringle in 1884 near 

 Mexican Boundary. Rothrock 691, Sonoyta Valley; 347, Cottonwood. Nealley, 

 Tanque Verde. Wilcox, Fort Huachuca. Jones 4014, Flagstaff. Lemmon 429, 

 430. Tourney 807, and 512, Tucson. 



Utah: Jones, Moab. 



Mexico: Hitchcock 3583 and 3536, Hermosillo; 3523, Llano. Palmer 235, 166, and 

 204, Guaymas; 791, Agiabampo; 1543, Culiacan; 1761, Ymala. Brandegee, 

 Culiacan. 



17. Bouteloua karwinskii (Fourn.). 



Chondrosium karwinskii Fourn. Mex. PL 2 : 137. 1881. The type is Karwinski 1479 

 from "Canon de las Minas et Victoria," Mexico. This number was not found in the 



Paris Herbarium. My interpretation is 

 based upon a panicle and two leaves of this 

 number from the herbarium of the St. 

 Petersburg Botanical Garden. Hemsley a 

 lists this as one of Fournier's unidentified 

 species, but gives the range as extending 

 from Texas to South Mexico and a specific 

 locality as La Miquiguana. I have seen 

 no collections of the species except as noted 

 below and can not say anything about 

 the basal portion of the type plant nor 

 its duplicates, having seen only a panicle 

 and some leaves. These, however, agree so 

 well with recent collections that I have 

 no hesitancy in referring tbem here. 



DESCRIPTION. 



An erect, cespitose, gray-glaucous, rigid 

 perennial, with stout, short, rhizomatous 

 base; culms simple, erect, 20 to 30 cm. high; 

 sheaths striate, smooth, close, the ligule 

 reduced to a few long, white hairs; blades 

 narrow, mostly basal, variable, about 7 cm. 

 long and 1 to 1.5 mm. wide; panicle race- 

 mose, about 10 cm. long; spikes 12 to 14 

 mm. long and 5 or 6 in number; spikelets pectinate on a flattened, short, hairy, 

 zigzag rachis, consisting of a lower perfect and an upper three-awned rudiment, 

 with scales and awns arising from a naked stipe about 1 mm. long; glumes smooth, 

 the second about 2 mm. long, the first a little shorter, acuminate, scarcely awned; 

 lemma 2 to 2.5 mm. long, pubescent, with 3 equal awns; palet about the length 

 of its lemma, with 2 very short awns, plicate; caryopsis not seen. (Plate 76. 

 Figure 47.) 



a Biol. Centr. Amer. Bot. 3: 564. 1885. 



Explanation of Plate 76. — Natural habitat of Bouteloua karwinskii, B. trinii, and B. stolonifera 

 among vegetation consisting largely of Cereus, Opuntia, Jatropha, etc., east of San Luis Potosi, Mexico. 



Fig. 47. — Bouteloua karwinskii. a, Spikelet; 6, c, 

 lemma and palet of first floret; d, e, rudimen- 

 tary lemma and palet of second floret; /, rudi- 

 ment of third floret, a, Scale 6.GG+; 6-/, scale 

 10. Prom Karwinski 1479, in St. Petersburg 

 Herb. 



