66 



RHAMNACEAE 



3106 



3108 



3;.07 



3106. Rhamnus Purshiana 



3107. Rhamnus rubra 



3119 



3108. Rhamnus califomica 



3109. Rhamnus alnifolia 



3110 



3110. Rhamnus crocea 



1. Ceanothus sanguineus Pursh. Northern Buck-brush or Oregon Tea-tree. 



Fig. 3111. 



Ceanothus sanguineus Pursh, FI. Amer. Sept. 1: 167. 1814. 



Ceanothus oreganus Nutt. in Torr. & Gray, Fl. N. Amer. 1:265. 1838. 



Shrub, 1-3 m. high, the branchlets usually reddish brown, glabrous. Leaves deciduous, ellip- 

 tic to ovate-elliptic, obtuse at apex, rounded or subcordate at base, glandular-serrulate, 2.5-7 cm. 

 long, light green and rather thin, glabrous above, the petioles, veins and young twigs short- 

 villous; panicles lateral on the twigs of the previous season, 5-10 cm. long; flowers white; 

 capsule 3-lobed, smooth. 



In open forests, mainly Canadian Zone; western British Columbia to western Montana, southward through 

 the Pacific States to northern California. Type locality: probably Lolo Creek, Idaho. Originally collected by 

 Lewis and Clark. May-July. 



2. Ceanothus velutinus Dougl. Sticky Laurel or Tobacco-brush, Fig. 3112, 



Ceanothus velutinus Dougl. ex Hook. Fl. Bor. Amer. 1; 125. 1830. 



Shrub, 1-2 m. high, much branched, stout, the branchlets olive-brown to reddish brown, 

 puberulent. Leaves evergreen, 2.5-8 cm. long, oval, obtuse or rounded at apex, subcordate at 

 base, finely and closely glandular-denticulate, firm-coriaceous, dark green, smooth and varnished 

 above, pale, puberulent beneath and prominently 3-nerved ; panicles borne in the axils of the 

 leaves of the previous season, puberulent ; flowers white ; capsule 3-lobed at summit, nearly smooth. 



Open woods and mountain slopes, mainly Canadian Zone; British Columbia to Montana, South Dakota, 

 Colorado, Utah and in the Pacific States to the North Coast Ranges and the southern Sierra Nevada, California. 



