53 



POA HANSENI Scribu., sp. n. ( I'l. IX.) 



A densely c:pspitose, slender, erect, glabrous, perennial, 2 dm. high, with narrow, 



chiefly radical and rather firm leaves and long-exsertcd strict panicles about 



4 cm. long. Leaves of the innovations intravaginal 5 to 8 cm. long, less than 



1 mm. in width, smooth. Culm leaves 2, 1 to 3 cm. long. .Sheaths and leaves 



glabrous. Ligule very short, obtuse. Panicle branches erect, the longer lower 



ones 1 to 2 cm. long. Spikelets 4 to 5 mm. long, compressed, 2- to 3-llo\vcred. 



Empty glumes suhequal, 3 to i mm. long, acute, scabrous on the keel excepting 



near the base, minutely scabrous 



all oyer, as are the flowering 



glumes. Flowering glumes 



lanceolate, acute, scabrous on 



the keel excepting near the base, 



hairs none. Palea about the 



length of the glume with scab- 

 rous keels. Callus naked Silver 



Lake, Amador County, Cal. (No. 



605, George Hansen, June 27, 



1892). Eelated to Foa inlnglei, 



but readily distinguished by its 



smaller spikelets. The species 



is named for Mr. George Hansen, 



the collector. 



POA ATROPURPUREA Scribn., 



sp. u. (PI. X.) 



A slender, somewhat wiry grass 3 to 

 4 cm. high from a creeping root- 

 stock, short and rather rigid 

 basal leaves, and densely flow- 

 ered dark purple panicles, 2 to 4 

 cm. long. Glumes smooth, 

 usually purjilish above. Sheaths 

 smooth, striate.- Ligule 1 to 1.5 

 mm. long, rounded-obtuse or 

 truncate, entire. Leaf-blades 

 of the sterile shoots narrow and 

 involute, at least when dry, 5 

 to 8 cm. long; those of the culm 

 somewhat broader, glabrous, 

 arcuate, 2 to 8 cm. long, the 

 upper ones much shorter. Pani- 

 cle long-exserted, the appressed 

 branches densely flowered, the 

 longer ones naked below. Spike- 

 lets ovate-obtuse, 3- to 5-flow- 

 ered, 3 to 4 mm. long, about 2 



mm. l)road. Axis of the rachilla breaking up, glumes firm in texture, the outer 

 ones nearly equal, ovate-obtuse, about 2 mm. long. First flowering glume 

 2 to 2.5 mm. long, oblong-ovate, obtuse, and glabrous. Palea about as long 

 as its glume, narrowly scabrous on the keel, grain nearly as long as the palea 

 which incloses it. 



San Bernardino Mountains, San Bernardino, Cal. (No. 2!t68, S. B. Parish, .Tune 18, 

 1894), altitude 1,900 meters; Bear Valley, San Bernardino Mountains (No. 3(!96, 

 S. B. Parish, June, 1895). 



Fig. 10. — Trisetum miiticum (Uohinil.) Scribn. : a, empty 

 glumes; b, tliree florets, aeon from tlio side, empty 

 "lumes removed. 



