112 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



SPOKOBOLUS. 



Panicle contracted, spike-like. 



Annuals, culms slender or filiform 1 . S.^filiformis. 



Perennials. 



Sheaths inflated, usually inclosing ha.se of panicle. . . 2. i?. I'agiiiaejiorus neglectus. 

 Sheaths not inflated. 



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



lemma 3. S. richartlsoni. 



Glume from two-thirds to almost the whole length 



of the lemma 4. S. depauperaiua. 



Panicle open, branches mostly spreading. 



Annuals, culms slender, pedicels longer than spikelets 5. S. confusus. 



Perennials. 



Panicle branches close-flowered nearIytoba.se; pedi- 

 cels equaling to shorter than spikelets it. S. crifptandnis. 



Panicle branches few-flowered, naked Ix^low. 



Pedicels smooth, seldom mtTre than twice the 



length of the spikelet 7. -S. alroides. 



Pedicels scabrous, 3 to many times the length 



of the spikelet 8. 6'. asperifolixta. 



1. Sporobolus filiformis (Thurb.) Kydb<Mg. Grntr. Nat. Herb. 3: 189. ISQA. 

 Vilfa de]xiu])€rata Jiliformis Thurb. Bot. King Explor. 376. 1871. 



Vilfa gracillima Thurb. in Wats. Bot. Cal. 2: 268. 1880. 

 Sporobolus gracUlimus Vasey, Descr. Cat. Gra.s.ses U. S. 44. 188o. 

 Type locality: Yosemite Valley, California. 

 Range: Washington to California and Colorado. 



Specimens examined: G len wood, F/ett 1396; Mount Adams, ffend«r«on, August 3, 1892; 

 HoM-e/; 84; Falcon Valley, 5u)tsJor/ 13. 

 Zonal distribution: Hudsonian. 



2. Sporobolus vaginaeflorus neglectus Scribn. U. S. Dept. Agr. Div. Agrost. Bull. 17. 

 rev. cd. 170. 1901. 



Sporobolus neglectus 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 distribttion: Transition. 



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

 Vilfa richardsoni Trin. Mem. Acad. St. Petersb. VI. Q^: 103. 1840. 

 Type locality: "Amer. boreal." Richardson. 



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



Specimens examined: Ellcnsburg, Piper 2581 ; Parker, Z)wn,n, August 8, 1901; Medical 

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

 Reservation near Mount Bonaparte, Griffiths & 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 2; 100. 1840. 



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

 island upwards. " Collected by Douglas. 



Range: Oregon and Washington to Montana. 



