112 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
SPOROBOLUS. 
Panicle contracted, spike-like. 
Annuals, culms slender or filiform. /....-.....-.-.---.- 1. 8. filiformis. 
Perennials. 
Sheaths inflated, usually inclosing base of panicle... 2. S. vaginaeflorus neglectus. 
Sheaths not inflated. 
Glumes one-third to one-half the length of the 
lemma...-.-.-------- Lee eee ee eee eee ee 3. S. richardsoni. 
Glume from two-thirds to almost the whole length 
of the lemma__..-.....-.-.------------- .. 4. 8. depauperatus. 
Panicle open, branches mostly spreading. 
Annuals, culms slender, pedicels longer than spikelets... 5. S. confusus. 
Perennials. 
Panicle branches close-flowered nearly to base; pedi- 
cels equaling to shorter than spikelets... ...~ - .- 6.8. eryptandrus. 
Panicle branches few-flowered, naked below. 
Pedicels smooth, seldom more than twice the 
length of the spikelet..............--.----- 7. S. airoides. 
Pedicels scabrous, 3 to many times the length 
of the spikelet.............-.-.----------- 8. S. asperifolius. 
1. Sporobolus filiformis (Thurb.) Rydberg, Contr. Nat. Herb. 8: 189. 1895. 
Vilfa depauperata filiformis Thurb. Bot. King Explor. 376. 1871. 
Vilfa gracillima Thurb. in Wats. Bot. Cal. 2: 268. 1880. 
Sporobolus gracillimus Vasey, Descr. Cat. Grasses U. 5. 44. 1885. 
Type Locaity: Yosemite Valley, California. 
Rance: Washington to California and Colorado. 
SPECIMENS EXAMINED: Glenwood, Flett 1396; Mount Adams, Henderson, August 3, 1892; 
Howell 84; Falcon Valley, Suksdorf 13. 
ZONAL DISTRIBUTION: Hudsonian. 
2. Sporobolus vaginaeflorus neglectus Scribn. U.S. Dept. Agr. Div. Agrost. Bull. 17. 
rev. ed. 170. 1901. 
Sporobolus neglectus Nash, Bull. Torr. Club 22: 464. 1895. 
Type Locauiry: None given. 
Rance: Washington to Massachusetts, Tennessee, and Kansas. 
SPECIMENS EXAMINED: Myers Falls, Kreager 590. 
ZONAL DISTRIBUTION: Transition. 
3. Sporobolus richardsoni (Trin.) Merrill, Rhodora 4: 46. 1902. 
Vilfa richardsont Trin. Mem. Acad. St. Petersb. VI. 6?: 103. 1840. 
Type LocALiry: “Amer. boreal.” Richardson. 
RanaGeE: British Columbia to Labrador, south to California and New Mexico. 
SPECIMENS EXAMINED: Ellensburg, Piper 2581; Parker, Dunn, 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. VI. 6?: 100, 1840. 
Type Locauity: “N. W. America. Barren sandy parts of the Columbia from Menzies’ 
island upwards.”’ Collected by Douglas. 
RanGE: Oregon and Washington to Montana. 
