410 MISC. PUBLICATION 42 3, TJ. S. DEPT. OF AGRICULTURE 



2. Rosa fendleri Crepin, Soc. Roy. Bot. Belg. Bui. 15: 91. 1876. 

 Apache, Coconino, and Yavapai Counties, also in the Chiricahua 



and Huachuca Mountains (Cochise County), 5,500 to 9,000 feet, 

 July and August. Minnesota to British Columbia, south to northern 

 Mexico. 



3. Rosa neomexicana Cockerell, Ent. News 1901: 41. 1901. 

 White River, Apache Indian Reservation, 6,300 feet {Goldman 



2492), Pinchot Ranger Station, Coconino County, 7,600 feet (Collom 

 246), July. Colorado, Utah, New Mexico, and Arizona. 



The Arizona specimens are scarcely typical, seemingly approaching 

 R. arizonica. 



*4. Rosa manca Greene, Pittonia 4: 11. 1899. 



Given for Arizona in North American Flora (22: 518), but the 

 writers have seen no specimens from this State. Colorado and Utah. 



5. Rosa arizonica Rydb., North Amer. Fl. 22: 516. 1918. 



Apache, Navajo, and Coconino Counties, south to Pima and 

 Cochise Counties, 4,000 to 8,000 feet, along streams and in pine forests 

 in partial shade, May to July, type from near Flagstaff (MacDougal 

 110). New Mexico and Arizona. 



The most abundant and most widely distributed wild rose in Ari- 

 zona. A form with usually double-serrate leaflets, these copiously 

 granuliferous beneath, and sepals more constantly bearing stipitate 

 glands, is found occasionally in northern and central Arizona, but 

 seems to be absent in the southernmost counties. It is var. granulifera 

 (Rydb.) Kearney and Peebles (R. granulifera Rydb.), the type of 

 which was collected west of Holbrook, Navajo County {Zuck in 1896). 



22. PRUNUS. Plum, cherry 



Small trees or large shrubs; leaves alternate or fascicled, simple; 

 flowers usually perfect, in racemes or corymbs, or solitary in the leaf 

 axils; calyx free from the ovary, 5-lobed, with a disk at the bottom; 

 petals 5, these and the numerous stamens inserted on the calyx; 

 pistil 1, the ovary 1-celled; fruit a dry or fleshy drupe, with 1 bony 

 seed. 



The plants are browsed, but cases have been reported of hydro- 

 cyanic acid poisoning of cattle and sheep. The foliage is usually sup- 

 posed to be more dangerous when wilted, but this is disputed. The 

 fruits are much eaten by birds and animals, and preserves are 

 sometimes made from those of the chokecherry (subgenus Padus). 



Key to the species 



1. Drupe pubescent, the exocarp almost dry, splitting on one side; leaves entire 

 or sparingly and irregularly dentate, sessile or nearly so, fascicled, linear- 

 spatulate, puberulent; flowers mostly solitary in the leaf axils, sessile or 

 nearly so, polygamo-dioecious; petals 2 to 3 mm. long; plant a shrub, 



divaricately branched: Subgenus Emplectoclad as 1. P. fasciculata. 



1. Drupe glabrous, the exocarp juicy; leaves regularlv crenate or serrate, peti- 



oled (2). 



2. Flowers few, in short corymbiform inflorescences; pedicels commonly villous; 



leaf blades crenate or crenulate, with conspicuously gland-tipped teeth; 



petals 4 to 6 mm. long: Subgenus Cerasus 2. P. emarginata. 



