172 DAVENPORT ACADEMY OF NATURAE SCIENCES. 



20. C. integerrimus, Hook. & Am., including variety parvifolius, 



Watson; C. parvifolius. 1 release. 1. a; C. Palmer 7, Trelease, 1. c. 



From an extended observation of the various forms of this species, 

 through the entire length of California, occupying not only the upper 

 valleys but the higher mountain slopes, I am led to the conclusion that 

 they properly belong to one species, of which it would be possible to 

 make many varieties. The size of the leaf is, of course, unimportant, 

 being easily explained by climatic differences; the leaf venation is also 

 seen to vary from distinctly triple-nerved to obscurely penninerved, 

 while the flower, most commonly white, takes on every shade of faded 

 or bright blue. The most reliable characters are in the texture of the 

 leaf, flexible and inconspicuously veined, the copious and diffuse thyrsus 

 of flowers, on prolonged leafy peduncles, and the fruit, 5-7 mm. broad, 

 and bluntly keeled. 



From a photograph of the typical C. Palmeri, Trelease, kindly fur- 

 nished by the author, I have no hesitation in including it as a southern 

 form of this rather polymorphous species. 



21. C. Andersoni, n. sp. Smooth throughout; branches light green, 

 glaucesent, younger shoots angular; leaves deep green above, entire, 

 oblong-ovate to oblanceolate, cuneate at base to a slender petiole, 

 obscurely penninerved, and paler beneath; inflorescence diffusely 

 thyrsoid, prolonged, leafy below, flowers white, with very slender pedi- 

 cels; fruit smooth, with thin, resinous exocarp, and rounded cocci. 



Habitat: — A tall shrub, 10-15 feet high, loosely branched above, 

 somewhat pendent, the prolonged inflorescence delicate snow-white, 

 flowers in May, fruit July. Santa Cruz Mountains, near Ben Lomond; 

 first collected by Dr. C. L. Anderson, 1887, whose name heretofore so 

 intimately connected with the botany of Santa Cruz, both on sea and 

 land, this attractive species properly commemorates. 



22. C. spinosus, Nutt. Coast range Santa Barbara, and southward. 



Group VI. Microphyllus. 



Leaves minute, rather rigid, smooth above, pubescent beneath, irreg- 

 ularly crenate-serrate, fasciculate in the axils, or developing into slender 

 leafy branches; inflorescence terminal or axillary, in small fasciculate 

 umbels. 



23. C. microphyllus, Michx. ) 



l- South Atlantic coast. 



24. C. serpyllifolius, Nutt. \ 



25. C. foliosus, n. sp. Branches slender, divergent, pubescent when 



