GRAMINEAE 



Tall perennials with flat blades and nodding panicles. Species 3, northern 

 regions of Europe, Asia, and America. (Greek kinna, a name used by 

 Dioscorides for a kind of grass.) 



1. C. latifolia Griseb. Culms 2 to 4 feet high; blades 5 to 7 lines wide; 

 panicle 6 to 12 inches long, the flexuous capillary branches spreading or droop- 

 ing; glumes about equal, scabrous, 2 lines long; lemma about equaling the 

 glumes short-awned ; palea 2-nerved, the nerves close together. 



In moist places in woods and along streams, extending southward in the 

 southern Sierra Nevada ; also in cooler regions of North America and Eurasia. 

 Locs. Mt. Tallac, Hitchcock 3130; Yosemite Nat. Park, Bolander 6090; Sequoia Nat. Park, 

 Alta Meadow, Hitchcock 3370, Kedwood Meadow, Hitchcock 3379. 



Refs. CINNA LATIFOLIA Griseb. in Ledeb. Fl. Eoss. 4: 435. 1853. Agrostis latifolia Trev. ; 

 Goepp. Beschr. Bot. Gaert. in Breslau 82. 1830. Cinna pendula Trin. Mem. Acad. St. Petersb. 

 VI. Sei. Nat. 4 1 : 280. 1840. C. arundinacea L. var. pendula Gray, Man. ed. 2. 545. 1856; 

 Thurb. in Wats. Bot. Cal. 2: 276. 1880. C. bolanderi Scribn. Proc. Acad. Phila. 1884: 290. 

 1884, type Bolander 6090. 



24. AGROSTIS L. 



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

 acuminate. Lemma shorter than the glumes, thin, obtuse, awnless or awned 

 from the back. Palea small, minute, or wanting. Rachilla (except in sect. 

 Podagrostis) not prolonged. Annual or usually perennial, slender grasses with 

 small spikelets. Species about 100, distributed over the entire world, espe- 

 cially in the north temperate zone. (An ancient Greek name of a forage grass, 

 from agros, a field.) 



Bachilla prolonged behind the palea (Section Podagrostis Griseb.) 1. A. thurberiana. 



Rachilla not prolonged. 

 Palea evident, 2-nerved. 



Palea about ^4 the length of lemma; panicle contracted 4. A. glomerata. 



Palea as much as y 2 the length of lemma; panicle open or contracted. 



Panicle contracted, lobed or verticillate ; glumes scabrous on keel and back 



2. A. stolonifera. 



Panicle open or contracted, but not lobed; glumes scabrous on keel, smooth on back. . . . 



3. A. alba. 

 Palea wanting or a small nerveless scale. 



Lemma provided with a slender awn 2^ lines long; annual 5. A. exigua. 



Lemma awnless or short-awned; perennials. 



Plants spreading by rhizomes (cf. A. lepida with short rhizomes). 



Tuft of hairs at base of lemma ^ to 1 line long 6. A. hallii. 



Tuft of hairs minute or wanting. 



Panicle contracted 7. A. pollens. 



Panicle open 8. A. foliosa. 



Plants tufted, not producing rhizomes or only very short ones. 



Panicle narrow, usually a part of the lower branches spikelet-bearing from base. 



Panicle strict, branches short and appressed; plant low and cespitose 



9. A. breviculmis. 

 Panicle narrow but not strict. 

 Lemma with an exserted awn. 



Glumes awn-pointed ; panicle narrow and rather compact . . . 10. A. microphylla. 



Glumes acute but not awn-pointed; panicle more open and verticillate 



11. A. ampla. 

 Lemma awnless or the awn included. 



Panicle 2 to 12 inches long; a taller plant of low altitudes. . .12. A. exarata. 



Panicle short, 1 to 2 inches long; a dwarf plant of high altitudes 



13. A. rossae. 



Panicle open, sometimes diffusely spreading; usually no short branches in lower whorls 

 of branches. 



