WOOTON AND STANDLEY FLORA OF NEW MEXICO. 115 



Involucral bract 4 to 10 cm. long, much exceeding the 

 spikelets, these few, frequently only 1; leaves 



half as long as the culm or more 3. S. americanm. 



Involucral bracts of several flat leaves much exceeding the com- 

 pound umbellate inflorescence. 

 Culms triangular; spikelets large, 10 to 20 mm. long, Light yel- 

 lowish brown; inflorescence a simple umbel or in young 



plants capitate 4. S. brittonianus. 



Cuhns terete; spikelets small, 2 to 7 mm. long, greenish; inflo- 

 rescence a once or twice compound umbellate cluster 

 with numerous unequal rays. 

 Style branches 2; achenes rounded on the back; inflores- 

 cence twice compound; spikelets not capitate 6. S.microcarpus. 



Style branches 3; achenes angled on the back; inflores- 

 cence generally once compound; spikelets densely 

 capitate at the ends of the rays 7. S. atrovirens. 



1. Scirpus pauciflorus Lightf. Fl. Scot. 1078. 1777. 

 Eleocharis pauciflorus Link, Hort. Berol. 1: 284. 1827. 

 Type locality: Highlands of Scotland. 



Range: British America to New York, New Mexico, and California; also in Europe. 

 New Mexico: A single specimen without locality seen. 



It is probable that the plant is not uncommon in the mountains of New Mexico but 

 has been overlooked by collectors. 



2. Scirpus olneyi A. Gray, Bost. Journ. Nat. Hist, 5: 238. 1845. 

 Type locality: In a salt marsh on the Seekonk River, Rhode Island. 

 Range: Across the United States. 



New Mexico: Salt Lake; Santa Rita; Dog Spring; Round Mountain. Wet alkaline 

 soil, in the Upper Sonoran Zone. 



3. Scirpus americanus Pers. Syn. PI. 1: 68. 1805. 

 Scirpus pungens Vahl, Enum. PI. 2: 255. 1808. 

 Type locality: "Hab. in Carolina inferiore." 



Ranoe: Throughout North America; also in South America. 



New Mexico: Farmington; Carrizo Mountains; Taos; San Juan; Wheelers Ranch; 

 Berendo Creek; Rincon; Mesilla Valley. In swamps, in the Lower and Upper Sonarao 



Zones. 



4. Scirpus brittonianus Pi] >er, Oontr. I'. S. Nat. Herb. 11: 157. L906. 



Scirpus cumpestris Britton in Britt. & Brown, Illustr. Fl. 1: 2l>7. 1896, not Roth, 

 1800. 



Scirpus robustus campestris Fernald, Ethodora 2: 241. 1000. 



Type locality: "On wet prairies and plains, Manitoba and Minnesota to Nebraska, 

 Kan.-as, and Mexico, west to Nevada." 



Range: As under type locality. 



Nbw Mexico: Carrizo Mountains; Farmington; Sail Lake; Mesilla Valley; near 

 Carrizozo; Roswell. Wet ground, in the bower and Upper Sonoran zon 



5. Scirpus occidentals | s . Wats.) Chase, Ethodora 6: 68. L904. 

 Sorpui laautru occidentals 8. Wats. Bot. Calif. 2: 218. 1880. 

 Type locality: San DiegO County, California. 



Ranoe: British Columbia and California to New Bngiand. 



Niw Mi.xico: Shiprock; Farmington; Gallo Spring; U prin Berendo 



Creek; Mesilla Valley; Rosweil; Carrizozo. Wei ground, in the Lower and I pper 

 Sonoran /.ones. 



