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I. CROSSOSOMA CALIFORNICUM Nutt. Jour. Acad. Phila. II. 1: 50. 
1848. 
Type locality: Santa Catalina Island. 
Distribution: This insular species has been found on Santa 
Catalina, San Clemente,and Guadalupe Islands, but not on the 
mainland. It is included for comparison and on account of its 
botanical interest. 
2. Crossosoma BicELovi §. Wats. Proc. Am. Acad. 11: 122. 
1876. 
Type locality: “In canyons near the south of Bill Williams 
River, W. Arizona.” baits, 
Distribution: Northwestern Arizona and adjacent California 
southward to Lower California. Lower Sonoran. 
Specimens examined: White-water S. B. & W. F. Parish 10; 
no locality, Parry & Lemmon 4; Palm Springs, Parish 4105. 
ROSACEAE. Rose Famity. 
Carpels becoming drupelets in fruit. 
Receptacle conical; stems prickly. 3. Rubus. 
Receptacle flat; stems not prickly. 4. Rubacer. 
Carpels becoming dry achenes or 2-seeded follicles. 
Hypanthium not fleshy. 
Styles elongated and plumose in fruit. 
Calyx 5-parted; leaves alternate. 
Petals present; flowers showy, terminal on short or elon- 
gated peduncles; leaves small, lobed. 
Sepals with alternate linear bractlets. 
5. Fallugia. 
Sepals without bractlets. 6. Cowania. 
Petals none; flowers small, axillary; leaves toothed or 
entire. 7. Cerocarpus. 
Calyx 4-parted; leaves opposite. 9. Coleogyne. 
Styles not becoming long and plumose in fruit; petals present. 
Leaves opposite. 1. Lyonothamnus. 
Leaves alternate. 
Flowers paniculate or racemose; leaves simple. 
Leaves plain, toothed above the middle. 
2. Sericotheca. 
Leaves terete, rarely obscurely toothed. 
8. Adenostoma. 
Flowers corymbose or solitary. 
Leaves 1-5-cleft; flowers solitary. 10. Kunzia. 
