GRASS FAMILY 117 



Lemma awned; panicle purple; ligule 2y 2 to 4 lines long 18. A. longiligula. 



Lemma awnless; ligule usually short. 



Panicle very diffuse; spikelets clustered toward end of branchlets 



14. A. hiemalis. 

 Panicle open, but not conspicuously diffuse. 



Plants producing short rhizomes 17. A. lepida. 



Plants not producing rhizomes. 



Plants delicate, 4 to 12 inches high 15. A. idahoensis. 



Plants taller, over l l / 2 feet high 16. A. schiedeana. 



1. A. thurberiana Hitchc. Culms slender, erect, 8 to 15 inches high; pani- 

 cle narrow, lax, more or less drooping, 2 to 3 inches long; spikelets green or 

 pale, rarely purple, 1 line long; lemma nearly as long as glumes, the palea 

 about % as long; rachilla prolonged behind the palea as a minutely hairy 

 pedicel, VQ line long. 



Bogs and moist places in the high Sierra Nevada, north and east to British 

 Columbia and Montana. 



Locs. Siskiyou Co., Butler 1767; Pine Creek, Lassen Co., Baker $ Nutting; Calaveras 

 Co., Hillebrand 2251; Lake Chiquita, Congdon; Mariposa Co., Bolander 6102; Yosemite Nat. 

 Park, Hitchcock 3269, 3338; Northfork, Griffiths 6652; Sequoia Nat. Park, Hitchcock 3366, 

 3407, 3473, 



Eefs. AGROSTIS THURBERIANA Hitchc. U. S. Dept. Agr. Bur. PI. Ind. Bull. 68: 23. pi. 1. 

 f . 1. 1905. A. aequivalvis [Trin. misapplied by] Thurb. in Wats. Bot. Gal. 2 : 271. 1880. 



2. A. stolonifera L. Culms usually decumbent at base, sometimes with 

 long creeping and rooting stolons; panicle contracted, lobed or verticillate, 

 especially at base, 1% to 4 inches long, light green or rarely purplish, the 

 branches spikelet-bearing from the base; glumes equal, obtuse, scabrous on 

 back and keel, 1 line long; lemma % line long, awnless, truncate and toothed 

 at apex; palea nearly as long as the lemma. Resembles in habit Polypogon 

 (itloralis, which differs in having awned glumes. 



Moist ground, especially along irrigation ditches, at low altitudes from 

 Mendocino Co. south, near the coast, and from Mariposa Co. and Inyo Co. 

 south, especially abundant in the irrigated regions of the southern part of the 

 state : southeast to Texas and Mexico. Introduced from Europe. 



Eefs. AGROSTIS STCLONIFERA L. Sp. PI. 62. 1753. A. verticillata Vill. Prosp. 16. 1779; 

 Thurb. in Wats. Bot. Cal. 2: 272. 1880; Davy in Jepson, Fl. W. Mid. Cal. 43. 1901; Abrams, 

 PI. Los Ang. 36. 1904. 



3. A. alba L. REDTOP. Culms erect or decumbent and rooting at base, 1 to 

 3 feet high, sending out from the base rhizomes or stolon-like stems; panicle 

 loose but not diffuse, 2 inches to 1 foot long, the lower branches in whorls; 

 glumes acute, 1 to l l / 2 lines long, scabrous on keel but not on back; lemma a 

 little shorter than the glumes, obtuse, rarely awned on back; palea % to % 

 as long as lemma. 



Cultivated as a meadow grass and frequently escaped along roadsides and in 

 waste places; apparently not native in California. 



Var. maritima Meyer. Differs from A. alba in having decumbent rooting 

 base and often widely spreading short-bladed stolons, and narrow contracted 

 panicles. Along the coast of Europe and North America; Pacific Coast from 

 'Sonoma Co. north to British Columbia. Upon the moist sand dunes the stolons 

 are conspicuous. 



Locs. Crescent City, Davy $ Blasdale 5944; Ft. Bragg, Davy & Blasdale 6124; Euss 

 Eanch, Davy # Blasdale 6203; Guerneville, Davy # Blasdale 6003. 



Eefs. AGROSTIS ALBA L. Sp. PI. 63. 1753; Thurb. in Wats. Bot. Cal. 2: 271. 1880. Var. 

 Meyer, Chloris Hanov. 656. 1836. A. maritima Lam. Encycl. 1: 61. 1783. The 



