WOOTON AND STANDLEY FLORA 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. palustris. 



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



Styles branches 3. 



Plants very small, 3 to 10 cm. high; fruit ob ovoid-oblong, with 



numerous longitudinal ridges and finer transverse ones. 6. E. acicularis. 

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



Tubercles constricted at the base, clearly 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 engelmanni 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. Eleocharis palustris (L.) Roem. & Schult. 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. Eleocharis glaucescens (Willd.) Schult. Mant. 2: 89. 1824. 

 Scirpus glaucescens Willd. Enum. PI. 7G. 1809. 



Eleocharis palustris 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 (II. P. K.) Roem. & Schult. SyBt. Veg. 2: I.",:;. IS17. 

 Scirpus montanusll. 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; Wheelers 

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

 Mangas Springs. Wet soil, in tin- Lower ami Upper S iran and the Transition zones. 



5. Eleocharis rostellata Torr. I'l. X. V. 2: :: 17. L843. 

 • Srir/m.s rosU llatlU Torr. Ann. Lye. X. Y. 3: 318. 1836. 



'I' i n: i OC \i.itv: Perm Van, W\s York. 



Range: Throug] i North America except in the extreme northern part. 



New Mexico: Gran I County; plains north of tin- White Sands. In wet soil, in the 

 Lower Sonoran Zone, 



.70°— 15 8 



