I 



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. americanus. 



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. briUoniantis. 



Culms 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.microcarpiis. 



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 ohieyi 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 alkaUne 

 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 CaroUna inferiore." 



Range: 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 LTpper Sonoran 

 zones. 



4. Scirpus brittoixianus Piper, Contr. U. S. Nat. Herb. 11: 157. 1906. 



Scirpus campestris Britton in Britt. & Brown, Illustr. Fl. 1: 267. 1896, not Roth, 

 1800. 



Scirpus robu^tus campestris Femald, Rhodora 2: 241. 1900. 



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

 Kansas, and Mexico, west to Nevada." 



Range: As under type locality. 



New Mexico: Canizo Mountains; Farmington; Salt Lake; Mesilla Valley; near 

 Carrizozo; Roswell. Wet ground, in the Lower and Upper Sonoran zones. 



5. Scirpus occidentaHs (S. Wats.) Chase, Rhodora 6: 68. 1904, 

 Scirpus lacustris occidentalis S. Wats. Bot. Calif. 2: 218. 1880. 

 Type locality': San Diego County, CaUfornia. 



Range: British Columbia and California to New England. 



New Mexico: Shiprock; Farmington; Gallo Spring; Mangas Springs; Berendo 

 Creek; Mesilla Valley; Roswell; Carrizozo. Wet ground, in the Lower and Upper 

 Sonoran zones. 



