ROSE FAMILY 451 



1. Purshia tridentata (Pursh) DC. Northern Antelope Bush. Fig. 2480. 



Tigarea tridentata Pursh, Fl. Amer. Sept. 333. 1814. 

 Purshia tridentata DC. Trans. Linn. Soc. 12: 158. 1817. 

 Kunzia tridentata Spreng. Syst. 2: 275. 1825. 



Shrub 1-3 m. high with brown or grayish bark, the young twigs somewhat tomentose and 

 glandular. Leaves cuneate in outline, 5-30 mm. long, 3-lobed at the apex, thick and revolute- 

 margined, white-tomentose beneath, glabrate or slightly pubescent above, the lobes oblong-linear ; 

 flowers short-pedicelled ; hypanthium funnelform, about 4 mm. long; sepals oblong, 3-4 mm. 

 long; petals yellow, spatulate-obovate, 7-9 mm. long; achene fusiform, with the short style IS 

 mm. long, velvety-pubescent and glandular ; seeds black. 



Dry slopes, mainly Arid Transition Zone; British Columbia and Montana to central California (mostly east 

 of the Sierra Nevada) and New Mexico. Type locality: prairies of the Rocky Mountains [Montana]. May-June. 



2. Purshia glandulosa Curran. Mojave Antelope Bush. Fig. 2481. 



Purshia glandulosa Curran, Bull. Calif. Acad. 1: 153. 1885. 



Kunzia glandulosa Greene, Pittonia 2: 299. 1892. 



Purshia tridentata var. glandulosa M. E. Jones, Proc. Calif. Acad. II. 5: 6S0. 1895. 



Shrub, 1-6 m. high with brown or gray bark, young twigs prominently glandular but other- 

 wise glabrous. Leaves cuneate in outline, 5-10 mm. long, 3-lobed or rarely 5-lobed at apex, 

 somewhat tomentose when young, becoming green and glabrous in age, conspicuously glandular- 

 punctate, the lobes linear-oblong, revolute ; flowers short-pedicelled; hypanthium funnelform, 

 5 mm. long, tomentulose; sepals elliptic, 3 mm. long; petals yellow, spatulate, 5-6 mm. long; 

 achene fusiform, with the style about 15 mm. long, short-pubescent; seed flesh-colored. 



Dry slopes, Arid Transition and Upper Sonora Zones; especially in the desert regions, southern Sierra 

 Nevada, California, and southern Nevada to northern Lower California and Arizona. Type locality: Mojave side 

 of Tehachapi Pass. April-June. 



27. CHAMAEBATIA Benth. PI. Hartw. 308. 1848. 



Erect glandular-pubescent shrubs with a strong resinous odor. Leaves twice or thrice 

 pinnate with numerous minute segments, persistent. Flowers in terminal few-flowered 

 paniculate cymes. Hypanthium persistent, turbinate-campanulate. Sepals 5, valvate. 

 Petals 5, white, spreading. Stamens numerous, in several series on the throat of the calyx. 

 Pistils solitary; style terminal, not elongated in fruit; ovules solitary, erect, basal. Fruit 

 an obovoid coriaceous achene; seed with scanty endosperm; radicle inferior. [Name 

 Greek, meaning low and bramble.] 



A California genus of two species. Type species, Chamaebatia foliolosa Benth. 



Leaves ovate or obovate in outline; leaflets tipped with a small more or less stalked gland; ovary hirsute. 



1. C. foliolosa. 



Leaves lanceolate in outline; leaflets tipped with a prominent gland half sunken in the tissue of the leaflets: ovary 

 glabrous. 2. C. australis. 



1. Chamaebatia foliolosa Benth. Mountain Misery. Fig. 2482. 



Chamaebatia foliolosa Benth. PI. Hartw. 308. 1848. 



An erect shrub 3-10 dm. high, with numerous leafy branches, the young twigs glandular- 

 hirsute and tomentulose but the entire integument soon exfoliating leaving a smooth dark brown 

 bark. Leaves ovate to obovate in outline, 2-10 cm. long, 1 . 5-6 cm. wide, viscid, glandular-hirsute 

 on the rachis and its branches, mostly thrice pinnate, ultimate divisions elliptical, tipped with a 

 small more or less stalked gland ; hypanthium glandular-hispid ; sepals lanceolate, short-acuminate, 

 not mucronate, about 4 mm. long ; petals obovate, 6-8 mm. long ; ovary more or less white-hirsute. 



Open pine forests, often abundant, Arid Transition Zone; Shasta County to Tulare County, California. Type 

 locality: "Excursion to Bear Valley," Nevada County, California. May-July. Bear Clover. 



2. Chamaebatia australis (Brandg.) Abrams. Southern Chamaebatia. Fig. 2483. 



Chamaebatia foliolosa var. australis Brandg. Bot. Gaz. 27: 447. 1899. 

 Chamaebatia australis Abrams, Bull. Torrey Club 34: 263. 1907. 



Low shrub intricately branched and leafy, bark almost black. Leaves lanceolate in outline, 

 3-6 cm. long, 1-2 cm. wide, mostly twice pinnate, viscid-pubescent, the rachis and its branches 

 rather sparsely beset with stout-stalked glands, ultimate divisions oval or rounded, tipped with 

 a large sessile gland partially sunken in the tissue ; cymes 1-4-flowered ; hypanthium tomentose 

 and glandular-hirsute; sepals 3 mm. long, abruptly mucronate; petals white, broadly obovate, 

 4-5 mm. long ; ovary glabrous. 



Dry chaparral ridges, Upper Sonoran Zone; San Miguel Mountain, San Diego County, California, and 

 northern Lower California. Type locality: La Grulla, Lower California. April-May. 



28. CERCOCARPUS H. B. K. Nov. Gen. & Sp. 6: 232. 1823. 



Small trees or shrubs, with dark colored hard wood and smooth bark. Leaves alternate, 

 simple, stipulate, evergreen, entire or toothed. Flowers small, apetalous, axillary or 

 terminal, solitary or fascicled. Hypanthium salverform, the lower part persistent, but 

 the campanulate limb deciduous ; sepals 5, broadly triangular to nearly subulate. Stamens 



