Purshia. ROSACE^E. 173 



rather slender prickles, somewhat glaucous : leaves 3-foliolate, rarely 5-foliolate, 

 often simple and 3-lobed on the flowering branchlets ; leaflets ovate to oblong, 

 coarsely toothed, smooth or more or less pubescent or tomentose ; veins, petioles, 

 peduncles, and calyx aculeate with slender prickles ; stipules oblanceolate to linear, 

 often long and toothed : calyx-lobes ovate-lanceolate, acuminate, or often foliaceously 

 tipped and exceeding the petals : fruit oblong, sweet. Linnaea, ii. 11. A\ macro- 

 petalus, Dougl. ; Hook. Fl. i. 178, t. 59. R. vitifolius, Cham. & Schlecht. 1. c., the 

 simple-leaved form. 



Frequent iu the Coast Ranges from Santa Barbara and Ventura counties (Ojai, Goodale) to 

 Fraser River ; also in Idaho. A very variable species. 



6. CHAIVLEBATIA, Benth. 



Calyx persistent, turbinate-campanulate, 5-lobed. Petals 5, spreading. Stamens 

 very numerous, in several rows on the throat of the calyx, short. Carpel solitary, 

 smooth : style terminal, villous at base, deciduous : stigma decurrent : ovule solitary, 

 erect. Fruit a coriaceous obovoid akene, included. Seed with a spongy testa and 

 small albumen : radicle inferior. A glandular-pubescent fragrant shrub ; leaves 

 thrice pinnate with numerous minute leaflets ; flowers white, in a loose cyme. 



1. C. foliolosa, Benth. An erect shrub, a foot or two high ; branches numer- 

 ous, slender, leafy, glandular-pubescent and viscid throughout, the outer integument 

 soon deciduous, leaving a smooth dark-brown bark : leaves ovate or oblong in out- 

 line, 2 or 3 inches long, finely dissected ; leaflets usually glandular-tipped ; stipules 

 small, linear : cymes few-flowered, terminating the young branches ; bracts leafy, 

 toothed or pinnatifid : calyx densely glandular-hairy, villous within, the ovate acu- 

 minate lobes as long as the tube or at length longer : petals white, obovate, 3 or 4 

 lines long : akene nearly filling the calyx, abruptly acute. PL Hartw. 108 ; Torrey, 

 PI. Fremont. 11, t. 6 ; Hook. Bot. Mag. t. 5171. 



On the western slope of the Sierra Nevada, at 3,000 to 7,000 feet altitude, from Mariposa Co. 

 to Nevada Co., flowering from May to July. It is very abundant in some places, filling the air 

 with its strong resinous rather disagreeable odor. 



7. PURSHIA, DC. 



Calyx persistent, funnel-shaped, 5-lobed. Petals 5, exceeding the calyx-lobes, 

 yellow. Stamens about 25, in one row. Carpels solitary, sometimes 2, narrowly 

 oblong, attenuate into the persistent style : stigma decurrent : ovule solitary, erect. 

 Fruit a coriaceous akene, pubescent, attenuate at each end, exserted. Seed oblong- 

 obovate, without albumen, the thin seed -coats separated by a layer of dark-purple 

 intensely bitter resinous matter : radicle inferior. A diffusely branched shrub ; 

 leaves mostly fascicled, cuneate, 3-lobed : flowers solitary, terminal on the short 

 branchlets. 



1. P. tridentata, DC. Usually 2 to 5 (rarely 8 or 10) feet high, with brown 

 or grayish bark ; the young branches and numerous short branchlets pubescent : 

 leaves cuneate-obovate, 3 to 12 lines long, 3-lobed at the apex, petioled, white- 

 tomentose beneath, greener above ; stipules short : flowers nearly sessile : calyx 2 to 

 4 lines long, tomentose with some glandular hairs, the oblong obtuse lobes shorter 

 than the tube : petals spatulate-obovate, 3 to 5 lines long : fruit half an inch long. 

 -Hook. Fl. i. 170, t. 58 ; Lindl. Bot. Reg. t. 1446 ; Torr. & Gray, Fl. i. 428 ; 

 Watson, Bot. King Exp. 82. 



Frequent throughout the interior from the eastern slope of the Sierra Nevada to the Rocky 

 Mountains, and from the British boundary to Arizona and New Mexico. 



