112 CALIFORNIA ACADEMY OF SCIENCES. 



21. C. DECUMBENS, Watson, I. c. 335.— Mountains of Cen- 

 tral California. 



-i--^ Leaves usually small, commonly only the largest 

 3-nerved, not papillate: fruit 3 mm. in diameter. 



22. C. DENTATUS, Torr. & Gray, Fl. i. 268, Watson I. c. 

 335. — Coast range of Southern California. 



SUBSP. ? FLORIBUNDUS. C. floribmidus Hook. Bot. Mag. 

 pi. 4806; AVatson, l. c. 338. — Known certainly only 

 from plants grown in European gardens, from Cali- 

 fornian seed. . 



SUBSP. ? LoBBiANUS. C. Lobbianus, Hook. Bot. Mag. 

 pi. 4810. — Coast Eange of Southern California. 



23. C. IMPEESSUS, n. sp. Villous, with short spreading 

 hairs: leaves broadly elliptical to nearly orbicular, 6 to 8 

 mm. long, loosely villous, especially on the veins below, 

 the upper surface deeply furrowed over the midrib and 

 several pairs of lateral nerves, the slightly glandular mar- 

 gin very revolute, appearing there as if crenate: pedun- 

 cles about 10 mm. long, scaly toward the base: inflorescence 

 sub-globose, compact: fruit not seen. — Santa Barbara 

 County, Cal. 



-i--i--^ Leaves medium-sized, oblong, not at all 3-nerved, 



papillate. 



24. C. PAPILLOSUS, Torr. & Gray, Fl. i. 268; Watson, I. c. 

 337. — Mountains of Western California. 



25. C. Veatchianus, Hook. Bot. Mag. pi. 5127; Watson, 

 I. c. 338. — Decribed and known only from European 

 plants raised from Californian seed. 



B. Leaves opposite or alternate, pinnately veined, coriaceous, of- 

 ten pungently toothed; stipules thick and spongy, taper- 

 pointed persistent; inflorescence densely corymbose, on short 

 spurs from the new wood; fruit usually large for the genus, 

 each carpel commonly bearing a dorsal horn, an alternating set- 

 of 3 crests or horns frequently at or near the apex. — Cerastes 

 Species of the Pacific Coast or Southwest, mostly with rigid 

 almost spinose twigs. 



