116 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



6. Scirpus microcarpus Presl, Rel. Haenk. 1: 195. 1828. 

 Scirpus lenticularis Torr. Ann. Lye. N. Y. 3: 328. 1836. 

 Scirpus sylvaticus digynus Boeckel. Linnaea 36: 727. 1870. 

 Type locality: Nootka Sound, Vancouver Island. 



Range: British America and New England to California, Utah, and New Mexico. 

 New Mexico: Chama; West Fork of the Gila; Mimbres River. Wet ground, in the 

 Transition Zone. 



7. Scirpus atrovirens Muhl. Descr. Gram. 43. 1817. 

 Type locality: Pennsylvania. 



Range: Northeastern Atlantic States west to Alberta, south in the Rocky Moun- 

 tains to New Mexico. 



New Mexico: Pecos (Standley 5104). Upper Sonoran Zone. 



6. HEMICARPHA Nees. 



Low tufted grasslike annual, 10 cm. high or less, with erect or spreading, slender 

 leaves and small, terminal, headlike or solitary spikelets with 1 to 3 leaflike bracts 

 surrounding and much exceeding them; glumes spirally imbricated, deciduous; 

 perianth wanting; stamen 1; achene obovoid-oblong, little compressed, brown. 



1. Hemicarpha micrantha (Vahl) Britton, Bull. Torrey Club 21: 34. 1894. 

 Scirpus micranihus Vahl, Enum. PI. 2: 254. 1806. 

 Hemicarpha subsquarrosa Nees in Mart. Fl. Bras. 2 1 : 61. 1842. 

 Type locality: Given doubtfully as South America. 

 Range: Nearly throughout North America and in South America. 

 New Mexico: Albuquerque (Bigelow). Wet ground. 



7. ERIOPHORTJM L. Cotton grass. 



Perennial from a rootstock, the culms erect; spikelets in a terminal umbel sub- 

 tended by an involucre of one or more leaves; flowers perfect; perianth of numerous 

 white bristles, these soft and cotton-like, much exserted ; style 3-cleft; achenes obovoid, 

 3-angled, light brown. 



1. Eriophorum angustifolium Roth, Tent. Fl. Germ. 1: 24. 1788. 

 Type locality: Germany. 



Range: Alaska and Newfoundland to Maine, Illinois, and northern New Mexico. 

 New Mexico: Costilla Valley (Wooton). Bogs. 



8. CAREX L. Sedge. 



Perennial grasslike plants with 3-ranked leaves and mostly 3-angled culms; flowers 

 unisexual, monoecious or dioecious; perianth wanting; stamens 3; pistillate flowers a 

 single pistil with 2 or 3 stigmas, in a saclike perigynium, this completely inclosing the 

 achene; achenes 3-angled or lenticular. 



A very large genus of which the following listed species probably represent only a 

 part of those indigenous to New Mexico. Collectors rarely take the trouble to examine 

 the plants unless their attention is particularly called to them. There are no doubt 

 several species common in the high mountains of the northern part of the State which 

 have not been collected. 



The writers are under special obligations to Mr. K. K. Mackenzie for assistance in 

 the preparation of an account of this genus. Mr. Mackenzie identified most of our 

 material and prepared the key to the species. 



