102 GRAMIXEAE 



Scheele, Linnaea 22: 343. 1S49. A. Jilipenilula Buckl. Proc. Acad. Phila. 1862: 93. 1862. 

 A. purpurea Nutt. var. californica Vasey, Contr. Nat. Herb. 3: 47. 1892, type Lemmon .5474, 

 Capay Valley, Yolo Co., but locality out of range and may be an error. A. fasciculaia Torr. 

 var. californica Vasey; Beal, Grasses N. Am. 2: 207. 1896. A.' purpurea Nutt. var. aequiramea 

 Merr. U. S. Dept. Agr. Div. Agrost. Circ. 34: 7. 1901; Abrams, Fl. Los Ang. 29. 1904. 



8. A. reverchoni Vasey. Perennial ; culms densely cespitose, erect, 1 to 2 

 feet high; blades involute, more or less flexuous, as much as 6 inches long; 

 panicle narrow, 4 to 6 inches long; branches short, appressed; glumes unequal, 

 awnless, smootli, or the first scabrous on the upper part of keel, the first about 

 3 lines long, the second about 5 lines long; lemma 5 to 6 lines long, smooth 

 except the minutely pubescent callus, narrowed above but not twisted; awns 

 equal, about 10 lines long. 



Deserts and plains, southern California (Newberry, Chase 5788) to Texas. 

 Eef.— Aristid.\ reverchoni Vasey, Bull. Torr. Club 13: 52. 1886. 



9. A. fendleriana Steud. Perennial ; culms densely cespitose, erect, usually 

 less than 1 foot high, blades crowded at base of culms forming a curly tuft, 

 involute, arcuate, sharp-pointed, pilose at base, usually 1 to 2 inches long, but 

 sometimes longer; panicle narrow, 2 to 4 inches long, bearing a few, mostly 

 short-pediceled, loosely arranged, more or less appressed spikelets; glumes 

 unequal, smooth, awnless, 1-nerved, the first about 3 lines long, the second 5 to- 

 6 lines long; lemma 4 lines long, seaberulous and slightly narrowed above; 

 callus minutely pubescent, Yo line long; avnas equal, about 1 inch long, as-^ 

 eending. 



Deserts and plains, southern California to Texas. San Bernardino Mts., 

 Parish 3299, 3828. 



Refs. — Aristida fendleriana Steud. Syn. PI. Glum. 1: 420, 1854. A. purpurea Nutt. var^ 

 fendleriana Vasey, Contr. Nat. Herb. 3: 46. 1892. A. fasciculata Torr. var. fendleriana 

 Soribn. in Britt. & Kearn. Trans. N. Y. Acad. Sci. 14: 23. 1894. A. longiseta Steud. var. 

 fendleriana Merr. U. S. Dept. Agr. Div. Agrost. Circ. 34: 5. 1901. 



14. STIPA L. 



Spikelets 1-flowered, in terminal, open or narrow panicles. Glumes narrow,, 

 acute or bristle-tipped. Lemma with a bearded sharp-pointed callus, pubescent, 

 indurated, convolute, including the small palea. terminating in a simple, usu- 

 ally stout, geniculate twisted awn. Kather coarse tufted perennials with nar- 

 row or involute blades. — Species about 100, throughout the tropical and tem- 

 perate regions of the world, especially on plains and deserts. (Greek stupa, 

 tow, referring to the feathery awns of some of the species.) 



Awn above second bend about 3% inches long, flexuous 1. S. comata. 



Awn above second beud not over I'o inches long, usually much sliorter. 

 Awn plumose. 



Awn with one bend, very plumose below bend 2. S. speciosa. 



Awn with two bends, plumose to second bend. 



Ligule 1% to 3 lines long 3. S. thurheriana.. 



Ligule very short. 



Sheaths glabrous 4. S. occidentalis. 



Sheaths pubescent 5. S. elmeri. 



Awn only scabrous or puberuleut. 



Lemma clothed with copious long hairs 2 lines long. 



Awn with two bends; plants 3 feet or more high 6. S. coronata. 



Awn usually with one bend; plants 1 to 1^4 feet high 7. S. parishii. 



Lemma more or less hairy, the hairs not over ij line long. 

 Panicles loose, the branches spreading. 



Terminal segment of awn about 1^^ inches long 8. S. setigera. 



Terminal segment of awn about % inch long 9. S. emincns.. 



