112 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



SPOB.OBOLUS. 



Panicle contracted, spike-liko. 



Annuals, culms slender or filiform 1 . S.JiUformis. 



Perennials. 



Sheaths inflated, usually inclosing base of panicle. . . 2. S. vaii'inaejiorus negledus. 

 Sheaths not inflated. 



Glumes one-third to one-half the length of the 



lemma 3. 6'. rldmrdsoni. 



Glume from two-thirds to almost the whole length 



of the lemma 4. .S'. clepnjiperatus. 



Panicle open, branches mostly spreading. 



Annuals, culms slender, pedicels longer than spiiielcts 5. S. amfusiis. 



Perennials. 



Panicle branches close-flowered nearly to base; pedi- 

 cels equaling to shorter than spikelets (>. S. (■n/])ia?}(lriis. 



Panicle branches few-flowered, naked below. 



Pedicels smooth, seldom more than twice the 



length of the spikelet . 7. S. aiioides. 



Pedicels scabrous, 3 to many times the length 



of the spikelet 8. ^S'. asperifolius. 



1. Sporobolus filiformis (Thurb.) Rydberg. Contr. Nat. Herl). 3: 189. 1895. 

 Vilfa depau perata flifoniiis Thurb. Bot. King E.xplor. 376. 1871. 



V Ufa gracillima Thuib. in Wats. Bot. Cal. 2: 268. 1880. 

 Sporobolus (jraciUimus Vasey, Descr. Cat. Grasses U. S. 44. 1885. 

 Type locality: Yo.semite Valley, California. 

 Range: Washington to California and Colorado. 



Specimens examined: Glenwood, F/e/< 1396; Mount Adams, 77f/if7e/'.son, August 3, 1892; 

 Eowell 84; Falcon Valley, SuksdorflZ. 

 Zonal distribution: Hudsonian. 



2. Sporobolus vaginaefiorus neglectus S( ribn. V . S. Dept. Agr. Div. Agrost. Bull. 17. 

 rev. ed. 170. 1901. 



Sporobolus ncfjlectus Nash, Bull. Torr. Club 22: 464. 1895. 



Type locality: None given. 



Range: Washington to Massachusetts, Tennessee, and Kansas. 



Specimens examined: Myers Falls, Kreager 590. 



Zonal distribltion: Transition. 



3. Sporobolus richardsoni (Trin.) Merrill, Rhodora 4: 46. 1902. 

 VUfa richardsoni Trin. Mem. Acad. St. Petersb. \l. 6-': 103. 1840. 

 TiPE locality: "Amer. boreal." Richardson. 



Range: British Columbia to Labrador, south to California and New Mexico. 



Speci.mens examined: Ellensburg, Piper 2581; Parker, Z^wnft, August 8, 1901; Medical 

 Lake, Henderson 2251; Grand Coulee, Griffiths cfc Cotton 359; Prosser, Cotton 636; Colville 

 Reservation near Mount Bonaparte, Griffiths cfe Cotton 359; Grand Coulee, Griffiths & Cotton 

 434. 



Zonal distribution: Transition and Upper Sonoran. 



4. Sporobolus depauperatus (Torr.) Scribn. Bull. Torr. Club 9: 103. 1882. 

 Vilfa depauperata Torr.; Hook. Fl. Bor. Am. 2: 257. 1840. 



Vilfa squarrosa Trin. Mem. Acad. St. Petersb. VL 6-: 100. 1840. 



TypE locality: "N. W. America. Barren sandy parts of the Columbia from Menzies' 

 island upwards.". Collected by Douglas. 



Range: Oregon and Washins:ton to Montana. 



