WOOTON AND STANDLEY FLOEA OF NEW MEXICO. 113 



flattened, or angular, erect; spikelets small; perianth of 1 to 12 bristles; stamens 2 or 3; 

 base of style swollen, persistent as a tubercle on the lenticular or 3-angled achene. 



KEY TO THE SPECIES. 



Style branches 2. 



Annuals; bristles shorter than the achenes; spikes oblong- 



cylindric ; tubercle broad and low 1 . E. engelmanni. 



Perennial by rootstocks; bristles longer than achenes; spikes 

 and tubercles various. 



Plants stout; tubercles conic-triangular 2. E. pahistris. 



Plants slender; tubercles almost cylindrical 3. E. glaucescens. 



Styles branches 3. 



Plants very small, 3 to 10 cm. high; fi-uit obovoid-oblong, with 



numerous longitudinal ridges and finer transverse ones. G. E. adcularis. 

 Plants larger, 20 cm. high or more; fruit various. 



Tubercles constricted at the base, cjearly distinct from 

 the achene; plants slender, with slender root- 

 stocks 4. E. montana. 



Tubercles apparently confluent with the achene, cylin- 



dric; plants stouter, not stoloniferous 5. E. rostellata. 



1. Eleocharis engelraanni Steud. Syn. PI. Glum. 2: 79. 1855. 



Type locality: St. Louis, Missouri. 

 Range: New England to California. 

 New Mexico: West Fork of the Gila (Metcalfe 589). In wet soil. 



2. Eleochaiis palustris (L.) Roem. & Schulfc. Syst. Veg. 2: 151. 1817. 

 Scirpus palustris L. Sp. PI. 47. 1753. 



Type locality: European. 



Range: Throughout North America except in the extreme northern part. 

 New Mexico: Chama; Farmington; Jewett; Mule Creek; Mesilla Valley. In wet 

 soil, in the Lower and Upper Sonoran zones. 



3. Eleocliaris glaucescens (Willd.) Schult. Mant. 2: 89. 1824, 

 Scirpus glaucescens Willd. Enum. PI. 76. 1809. 



Eleocharis palusttis glaucescens A. Gray, Man. 558. 1848. 

 Type locality: "Habitat in America boreali." 

 Range: Throughout North America except in the extreme north. 

 New Mexico: Santa Fe Creek; Pecos; Las Vegas. Wet soil, in the Upper Sonoran 

 Zone. 



4. Eleocharis montana (H. B. K.) Roem. & Schult. Syst. Veg. 2: 153. 1817. 

 Scirpus montanus H. B. K. Nov. Gen. & Sp. 1: 226. 1816. 



Type locality: "In monte Quindiu," Colombia. 



Range : Colorado to California, southward to South America. 



New Mexico: Zuni Reservation; Las Vegas; Bear Canyon; Rio Pueblo; \Mieeler8 

 Ranch; Berendo Creek; Rincon; Apache Teju; Mesilla Valley; Silver Spring Canyon; 

 Mangas Springs. Wet soil, in the Lower and Upper Sonoran and the Transition zones. 



5. Eleocharis rosteUata Torr. Fl. N. Y. 2: 347. 1843. 

 Scirpus rostellatus Torr. Ann. Lye. N. Y. 3: 318. 1836. 

 Type locality: Penu Yan, New York. 



Range: Throughout North America except in the extreme northern part. 

 New Mexico: Grant County; plains north of the ^Miite Sands. In wet soil, in the 

 Lower Sonoran Zone. 

 52576°— 15 8 



