[68 DAVENPORT ACADEMY OF NATURAL SCIENCES. 



thyreoid, proceeding from shoots of the same year, or from buds fully 

 formed the previous season, the elongated peduncles more or less leafy 

 bracted below; fruit smooth, or triangular carinate, exocarp frequently 

 resinous. VI. groups — 25 species. 



Group I. Americanus. 



Leaves renewed annually, broadly cordate to ovate, triple-nerved 

 from the base, reticulately veined, pubescent to densely tomentose be- 

 neath, serrate; inflorescence mostly from the same season's growth — 

 except No. 3. 



1. C. Americanus, L. / Eastern Atlantic slope, extending to the 

 C. mat us, Desf. C Rocky Mountains. 



C. sanguineus, Pursh. North Pacific coast. 

 C. decumbens, Watson. Sierra Nevada of California. 

 C. azureus, Desf. Mexico. 



Group II. Incanus. 



Branches usually spinose; leaves ovate to orbicular, entire, or gland- 

 ularly serrate, canescently pubescent, triple-nerved, with inconspicuous 

 mid-veins. 



6. C incanus, Torr. & Gray. Santa Cruz Mountains. 



7. C. cordulatus, Kellogg. Sierra Nevada. 



S. C. dii'aricatus. Nutt. Southern California, including variety 

 eglandulosus, Torr., which is the common form. 



9. C. intricatus, n. sp. Densely branched, younger shoots hirsute- 

 ly pubescent; leaves somewhat rigid, crowded on short stems, short 

 petiolate, narrowly ovate (15x6 mm.), dull green above, hoary pubes- 

 cent beneath, triple-nerved from the base, with inconspicuous mid- 

 veins, more or less strongly revolute, margins entire, but glandularly 

 ciliate; inflorescence short pedunculate, not exceeding the leaves — 

 flowers not seen — fruit 4 mm. broad, smooth, with resinous exocarp, 

 cocci with blunt apical crests. 



Habitat: — Known only from fruiting specimens collected on the sum- 

 mit of Mount Tamalpais, Marin County, July, 1886, by Mrs. M. K. 

 Curran; closely allied to C. cordulatus, but differing in the character 

 of its foliage, and peculiar in its isolated locality. 



10. C. Fendleri, Gray. Rocky Mountains of Colorado and New 

 Mexico, to Arizona. 



11. C. depressus, Benth. Central Mexico. 



