WOOTON AND STANDLEY—FLORA OF NEW MEXICO, 118 
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 obovoid-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... 2... 222... e ee eee eee eee eee eee ee eee 4. E. montana. 
Tubercles apparently confluent with the achene, cylin- 
dric; plants stouter, not stoloniferous............. 5. E. rostellata. 
1. Eleocharis engelmanni Steud. Syn. Pl. Glum. 2: 79. 1855. 
Tyre 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. Pl. 47. 1753. 
TYPE LOCALITY: European. 
Rance: 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. 
8. Eleocharis glaucescens (Willd.) Schult. Mant. 2: 89. 1824. 
Scirpus glaucescens Willd. Enum. Pl. 76. 1809. 
Eleocharis palustris glaucescens A. Gray, Man. 558. 1848, 
Tyre LocaLiry: ‘‘ Habitat in America boreali.”’ 
RanaeE: 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. 
TyPeE LocaLity: ‘‘In monte Quindiu,’’ Colombia. 
Rane@eE: 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 the Lower and Upper Sonoran and the Transition zones. 
5. Eleocharis rostellata Torr. Fl. N. Y. 2: 347. 1843. 
Scirpus rostellatus Torr. Ann. Lyc. N. Y. 3: 318. 1836. 
TYPE LocALITy: Penn Yan, New York. 
RaNnGE: Throughout North America except in the extreme northern part. 
New Mexico: Grant County; plains north of the White Sands. In wet soil, in the 
Lower Sonoran Zone. 
52576°—15——_8 
