102 



GRAM1NEAE 



Scheele, Linuaea 22: 343. 1849. A. filipendula Buckl. Proc. Acad. Phila. 1862: 93. 1862. 

 A. purpurea Nutt. var. calif ornica 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. fasciculata Torr. 

 var. calif ornica 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 

 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, smooth, 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, smoot 

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

 equal, about 10 lines long. 



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

 Bef. ARISTIDA REVERCHONI Vasey, Bull. Torr. Club 13: 52. 1886. 



9. A. f endleriana 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, scaberulous and slightly narrowed above; 

 callus minutely pubescent, y 2 line long; awns equal, about 1 inch long, as- 

 cending. 



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

 Parish 3299, 3828. 



Befs. ARISTIDA FENDLERIANA Steud. Syn. PI. Glum. 1: 420. 1854. A. purpurea Nutt. var. 

 f endleriana Vasey, Contr. Nat. Herb. 3 : 46. 1892. A. fasciculata Torr. var. fendlerian 

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

 f endleriana Merr. U. S. Dept. Agr. Div. Agrost. Cire. 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. Rather 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 stup* 

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



Awn above second bend about 3* inches long, flexuous \. S. comatc 



Awn above second bend not over l 1 /^ inches long, usually much shorter. 

 Awn plumose. 



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



Awn with two bends, plumose to second bend. 



Ligule iy 2 to 3 lines long 3. s. thurberiar 



Ligule very short. 



Sheaths glabrous 4. S. occidentalis 



Sheaths pubescent 5. S. elmt 



Awn only scabrous or puberulent. 



Lemma clothed with copious long hairs 2 lines long. 



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



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



Lemma more or less hairy, the hairs not over % 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. eminens. 



