76 



GRAMINEJE. 



Brae let awnless or with a very short awn: bracts more than % the length of 

 the ^pikelet. 



Rootstock tufted, not stoloniferous 3. A.tenerum. 



Rootstock long, slender, running and stoloniferous .... 4. A. arenicolum. 



1. A. scabrum Beauv. Australian Wheat-grass. Stems 

 stout, erect, 2 to 3 ft. high; blades short, involute, smooth below; 

 spike 8 to 16 in. long; spikelets 10 to 14 in number, 1 to 1^ in. long 

 excluding awns, narrow. 6 to 10-flowered, the lowest f to H in. apart; 

 bracts about 7 lines long, awnless, cartilaginous, pale green, with 

 broad, scarious margins, smooth or minutely and sparsely scabrid, 

 striate; bractlet chartaceous, with a broad, scarious margin, minutely 

 scabrid; awn 8 to 18 lines long, mostly flexuous and widely divergent. 



A pale, glaucous, Australian species, sparingly introduced into 

 California: San Jose, 1879, Miss Norton; also reported by Bolander 

 from "very dry hillsides, south side of Eel Kidge, Mendocino Co., 

 June 15, 1867," and "in gardens near San Francisco." 



2. A. Richardsoni (Trin.) Schrad. Richardson's Whkat- 

 gr\ss. Stems stout, sub-solitary, erect, 3 to 3£ ft. high; blades 2 to 

 6 in. long, 1\ lines wide, setaceous-pointed, scabrous above, smooth 

 below; spike 5 to 7 in. Ions; lowest spikelets about \ in. apart; spike- 

 lets 6 to 7 lines long without the awn, 3 to 4-flowered; bracts 5 to 7 

 lines long without the awn, scabrous on the many nerves, their awns 

 about 2h lines long; awn of the bractlet 6 to 7 lines long, erect. 



Oakland, Bolander; probably introduced, apparently not since 

 collected. July. 



3. A. tenerum Vasey. Slender Wheat-grass. Rootstock 

 tufted, not stoloniferous; stems slender, erect, from a slightly ascend- 

 ing, leafy base, 14 to 20 in. high; blades 1 to 6 in. long, 1 to If lines 

 wide, flat, rough; spike 3 J to 5 in. long; spikelets 13 to 16; bracts 

 more than § the length of the spikelet, awnless or awn-pointed, gla- 

 brous scabrously-ciliate, broadest below the middle. — (A. repens var. 

 tenerum Beal.) 



San Mateo, Bolander. 



4. A. arenicolum Davy, sp. nov. Dune Wheat-grass. Root- 

 stock long, slender, creeping and stoloniferous; stems 6 in. high, erect 

 or arcuate at base, clothed with dead sheaths below; branches intra- 

 vaginal; sheaths glabrous; ligule reduced to a ring £ line long; blades 

 convolute, glabrous below, above clothed with a sparse pubescence 

 and deeply channeled. 6 to 10 in. long, 2 lines wide, auricled at base, 

 the auricle prolonged into a curved horn; spike \\ to 2 in. long; 

 rachis almost smooth; spikelets approximate, \ in. long, 4 to 5- 

 flowered; bracts 5 to 5.} lines long, long-acuminate, subulate-pointed, 

 ciliate, 3 to 5-nerved, coriaceous; bractlets broad, subulate-pointed, 

 scabrid coriaceous; palea ciliate. 



A dwarf maritime species, apparently rare: type locality, sand-dunes 

 at Point Reyes, Davy, no. 6879; Bodega Point, Eastwood. 



44. ELYMUS L. Wild Rye. 

 Perennials; stems tall and rigid. Leaf-blades usually broad. 



