WOOTON AND STANDLEY FLORA OF NEW MEXICO. 39 



3. Ephedra torreyana S. Wats. Proc. Amer. Acad. 14: 299. 1899. 

 Type locality: "New Mexico to S. TJtali." 



Range: Colorado to California and Mexico. 



New Mexico: Carrizo Mountains; Farmington; Santa Fe; Albuquerque; Nara 

 Visa; Organ Mountains; San Andreas Mountains; Dona Ana Mountains; White 

 Sands; Roswell. Plains and low hills, in the Lower and Upper Sonoran zones. 



4. Ephedra trifurca Torr. in Emory, Mil. Reconn. 152. 1848. 



Type locality: "From the region between the Del Norte and the Gila, and the 

 hills bordering the latter river to the desert west of the Colorado." 



Range: Colorado and Utah to northern Mexico. 



New Mexico: Mangas Springs; Gila; San Antonio; Carrizalillo Mountains; Dem- 

 ing; Las Cruces; Organ Mountains. Plains and low hills, in the Lower and Upper 

 Sonoran zones. 



Class 2. ANGIOSPERMAE. 

 Subclass 1. MONOCOTYLEDONES. 



Order 7. PANDANALES. 



8. TYPHACEAE. Cattail Family. 



1. TYPHA L. Cattail. 



Tall marsh plant with creeping rootstocks and glabrous erect terete stems; leaves 

 narrow, flat, striate; flowers monoecious, densely crowded in terminal spikes, the 

 pistillate flowers below and the staminate above; ovary 1, stipitate, 1 or 2-celled. 



1. Typha latifoHa L. Sp. PI. 971. 1753. 



Type locality: "Habitat in paludibus Europae." 



Range: Throughout most of North America; also in the Old World. 



New Mexico: Farmington; Shiprock; Pecos; Mangas Springs; Fort Bayard; 

 along the Rio Grande from Albuquerque to El Paso. In swamps and marshes, in the 

 Lower and Upper Sonoran zones. 



The Mexicans use the stems for a thatch upon which to lay mud roofs. 



Order 8. NAIAD ALES. 



KEY TO THE FAMILIES. 



Gynoecium of distinct carpels; stigmas disklike 



or cuplike 9. POTAMOGETONACEAE (p. 39). 



Gynoeciumof united carpels; stigmas slender. . 10. NAIADACEAE (p. 41). 



9. POTAMOGETONACEAE. Pondweed Family. 



Aquatic herbs with jointed leafiy stems; leaves sheathing at the base or stipulate; 

 flowers perfect or unisexual, the perianth of 4 or 6 distinct valvate segments, or tubular, 

 or none; &tamens 1, 2, 4, or 6; ovaries 1 to 6, distinct, 1-celled, usually 1-ovuled; 

 fruit indehiscent. 



KEY TO THE GENERA. 



Flowers perfect, spicate; stamens 4 1. Potamogeton (p. 40). 



Flowers monoecious, axillary; stamen 1 2. Zanichellia (p. 40). 



