ROSE FAMILY 



407 



7-8 mm. long, broadly spatulate, narrowed to a distinct claw; follicles 1-3, 6-10 mm. long; 

 seeds 2-5. i 



Canyons of the desert ranges, Lower Sonoran Zone; Ord Mountains, Mojave Desert, California, to north- 

 western Arizona, northern Lower California, and Sonora, Mexico. Type locality: "mouth of Bill Williams River, 

 W. Arizona." Feb.-April. 



Family 64. ROSACEAE. 

 Rose Family. 



Herbs, shrubs, or trees, with alternate or rarely opposite, simple or compound, 

 commonly stipulate leaves. Hypanthium free from the ovary, naked or sometimes 

 bearing bractlets. Disk adnate to the base of the hypanthium. Sepals 5, rarely 4, 

 appearing as if lobes of the calyx-like hypanthium. Petals distinct, attached to the 

 rim of the hypanthium and alternating with the sepals, rarely wanting. Stamens 

 distinct, usually numerous and commonly in three series. Carpels one to many, 

 usually completely separate, free from the hypanthium. Style terminal or lateral or 

 rarely basal. Ovary 1-celled or rarely imperfectly 2-celled ; ovules one to several, 

 anatropous or sometimes amphitropous or orthotropous. Fruit follicles, achenes, or 

 more or less aggregate drupelets. 



A family of about 75 genera and over 1,200 species, of wide geographic distribution. 



2361 



2364 



2363 



2365 



2360. Crossosoma Bigelovii 



2361. Lyonothamnus floribundus 



2362. Physocarpus capitatus 



2363. Physocarpus malvaceus 



2364. Physocarpus alternans 



2365. Spiraea densiflora 



