628 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



2. Oenothera iongissima Rydb., Torrey Bot. Club Bui. 40: 65. 1913. 



Oenothera clutei A. Nels., Amer. Bot. 28: 22. 1922. 



Coconino and Mohave Counties, 4,000 to 7,000 feet, damp and 

 springy places, July to September. Southern Utah and northern 

 Arizona to eastern California. 



Distinguished from 0. hookeri, its nearest relative, by its remark- 

 ably long hypanthium. 



3. Oenothera procera Woot. and Standi., Contrib. U. S. Natl. Her- 



barium 16: 156. 1913. 



Oak Creek, Coconino County (Fulton 7329), Ryan Ranch, southern 

 Apache County (Harrison 4843). Southern Colorado, New Mexico, 

 and Arizona. 



Doubtfully distinct from 0. strigosa Rydb. in its smaller flowers and 

 less shaggy pubescence. 



4. Oenothera laciniata Hill, Veg. Syst. 12: 64. 1767. 



Almost throughout the State except the extreme western part, 

 1,270 to 9,500 feet, disturbed and fairly damp places, commonly in 

 pine forest, May to October. 



Represented in Arizona by var. pubescens (Willd.) Munz (O. 

 pubescens Willd.), which ranges from Texas to Arizona, south to 

 Ecuador. The flowers open in the evening. 



5. Oenothera coronopifolia Torr. and Gray, Fl. North Amer. 1: 495. 



1840. 



Anogra coronopifolia Britton, Torrey Bot. Club Mem. 5: 234. 

 1894. 



Coconino County (several collections), Peach Springs, Mohave 

 County (Lemmon in 1884), Benson, Cochise County (Lemmon 43), 

 6,000 to 8,000 feet, usually in dry sod on plains, June to August. 

 South Dakota to Kansas, Utah, and Arizona. 



6. Oenothera albicaulis Pursh, Fl. Amer. Sept. 733. 1814. 



Anogra albicaulis Britton, Torrey Bot. Club Mem. 5: 234. 



1894. 



Widely distributed in Arizona, 2,400 to 7,500 feet, rather dry grassy 

 and disturbed places, March to July. South Dakota and Montana 

 to Chihuahua and Arizona. 



7. Oenothera deltoides Torr. and Frem. in Frem., Exped. Rockv 



Mount. Rpt. 314. 1845. 



Oenothera trichocalyx of authors. Not Nutt. 

 Key to the varieties 



1. Hairs of the sepals, hypanthium, and upper stems spreading, not closely ap- 

 pressed (2). 

 2. Petals 2 to 4 cm. long; uppermost leaves usually less deeply divided, rarely 

 pinnatifid; buds with straight hairs 1 to 1.5 mm. long; capsules 2.5 to 7 



cm. long, 2 to 3 mm. thick at base O. deltoides (typical) . 



2. Petals usually less than 2 cm. long; uppermost leaves deeply sinuate-dentate 

 or pinnatifid, the portion along the midrib only 3 to 4 mm. wide; buds 

 with curly hairs 2 or more mm. long; capsules 1.5 to 3 cm. long, 3 to 5 



mm. thick at base var. piperi. 



1. Hairs of the sepals, hypanthium, etc., closely appressed, or both appressed and 

 spreading (3). 



