726 TREES OF NORTH AMERICA 



Distribution. Rich bottom-lands and the sides of canons, usually in coniferous forests; 

 shores of Puget Sound eastward along the mountain ranges of northern Washington to the 

 Bitter Root Mountains of Idaho and the shores of Flat Head Lake, Montana, and south- 

 ward to central California; Arizona, southern slope of the Grand Canon of the Colorado 



Fig. 652 



River, Coconino County (A Rehder), Cave Creek Canon, Chiricahua Mountains, 

 Cochise County (J. W. Tourney). 



Occasionally cultivated in the gardens of western Europe and of the eastern United 

 States. 



5. CEANOTHUS L. 



Small trees or shrubs, with slender terete branches, without a terminal bud, and small 

 scaly axillary buds. Leaves petiolate, 3-ribbed from the base, or pinnately veined, per- 

 sistent in the arborescent species. Flowers on colored pedicels, in umbellate fascicles col- 

 lected in dense or prolonged terminal or axillary thyrsoid cymes or panicles, blue or white; 

 calyx colored, with a turbinate or hemispheric tube and 5 triangular membranaceous peta- 

 loid lobes; disk fleshy, thickened above; petals 5, inserted under the margin of the disk, 

 unguiculate, wide-spreading, deciduous, the long claw infolded round the stamens; stamens 

 .">, inserted with and opposite the petals, persistent, filaments spreading; ovary partly im- 

 mersed in and more or less adnate to the disk, 3-celled, sometimes 3-angled, the angles 

 often surmounted by a fleshy gland persistent on the fruit; styles short, united below; 

 stigmas 3-lobed with spreading lobes; ovule erect from the base of the cell. Fruit 3-lobed, 

 subglobose, with a thin outer coat, soon becoming dry, and separating into 3 crustaceous 

 or cartilaginous longitudinally 2-valved nutlets. Seeds erect, obovoid, lenticellate, with 

 a broad basal excrescence surrounding the hilum; seed-coat thin, crustaceous; albumen 

 fleshy; embryo axile; cotyledons oval or obovate. 



Ceanothus is confined to the temperate and warmer regions of North America, with 

 about thirty species, mostly belonging to California. The leaves, bark, and roots are as- 

 tringent and tonic. Of the species of the United States three are small trees. 



The generic name is from Kedvudos, the classical name of some spiny plant. 



CONSPECTUS OF THE ARBORESCENT SPECIES OF THE UNITED STATES. 



Branchlets not spinose, leaves 3-ribbed. 



Leaves broad-ovate to elliptic, subcordate or rounded at base, pale and tomentose below. 



1. C. arboreus (G). 



