FLOWERING PLANTS AND FERNS OF ARIZONA 637 



the same range in the State but perhaps grows at somewhat higher 

 altitudes. 



3. Gaura coccinea Nutt. ex Pursh, Fl. Amer. Sept. 733. 1814. 



Key to the varieties 



1. Capsules about 10 mm. long, 1.5 to 2 mm. wide; anthers 4 to 5 mm. long. 



var. arizoxica. 

 1. Capsules 5 to 7 mm. long, 2.5 to 3 mm. wide; anthers 2 to 3 mm. long 2 . 



2. Stem and leaves glabrous var. glabra. 



2. Stem and leaves more or less pubescent (3). 



3. Leaves linear, subentire var. parvifolia. 



3. Leaves (at least the lower ones) lanceolate and sinuate-dentate 4 . 



4. Main leaves mostly plane, oblong, crowded; flowers crowded; inflores- 

 cence not peduncled; plant 10 to 30 cm. high__G. coccixea (typical). 

 4. Main leaves mostly waved and crisped, acutish, not crowded; flower- 

 not crowded; inflorescence with a short peduncle; plant 30 to 40 

 cm. high var. epilobioides 



Typical G. coccinea has been found in most parts of Arizona except 

 the southwestern desert portion, 3,000 to 8,000 feet, rather dry flats 

 and plains, May to September. Southern Canada to Texas, Arizona, 

 and eastern California. The var. epilobioides (H. B. K.) Munz has 

 much the same distribution in the State and ranges from Texas to 

 Arizona and Mexico. The var. parvifolia (Torr.) Torr. and Gray 

 is known from Apache, Yavapai. Cochise, and Santa Cruz Counties, 

 and ranges from Kansas and Colorado to northern Mexico. The var. 

 glabra (Lehm.) Torr. and Gray has the same general range within and 

 outside the State as has the typical form. The var. arizonica Munz 

 occurs in Yavapai, Gila, and Pima Counties, 1,800 to 6,000 feet, and 

 ranges into New Mexico and Coahuila. 



10. CIRCAEA. ExCHAXTERS-XIGHTSHADE 



Plants low, delicate, herbaceous, perennial, with short slender 

 rootstocks and small tubers; leaves thin, opposite, petioled; flowers 

 small, racemose; sepals and petals 2; fruit 1-celled, 1-seeded, inde- 

 hiscent, pear-shaped, bristly with hooked hairs. 



1. Circaea pacifica Asch. and Mag., Bot. Ztg. 29: 392. 1871. 



Greer, Apache County, 8,800 feet (Eggleston 17151), Oak Creek, 

 Coconino County (Fulton 9673), Pinaleno Mountains, Graham 

 Count}' (Peebles et al. 4482), rich soil in shady ravines, June to July. 

 Rocky Mountains to British Columbia, Arizona, and southern Cali- 

 fornia. 



Very doubtfully distinct from C alpina L. 



89. HALORAGIDACEAE. \Yatermilfoil family 



Plants herbaceous, perennial, aquatic, the stems wholly or partly 

 immersed; leaves commonly hi whorls; flowers minute, perfect or 

 unisexual; petals when present usually 4; stamens 1 to 8; ovary 

 inferior, 1- to 4-celled; fruit indehiscent. 



Key to the genera 



1. Leaves Tat least the submersed ones"; pinnatifid to capillary-dissected; flowers 

 mostly unisexual; stamens more than 1; ovary 2- to 4-celled. 



1. Myhiophyllum. 

 1. Leaves all entire; flowers mostly perfect; stamen 1; ovary 1-celled. 



2. HlPPTJRIS. 



