STUDIES IN CEANOTHUS. 207 



From Encinitas, San Diego County, to Guadalupe 

 Greek, Baja California, always near the coast. No. 90, 

 San Diego; No. 91, Encinitas; No. 113, Guadalupe 

 Creek. 



Var. RiGiDUS (Nutt.). 



17. C. rhjidus (Nutt.! mss.): " Youngbrauches pubescent; leaves opposite 

 aud crowded, cuueate-obovate, mostly retuse, thick aud coriaceovis, niu- 

 crouately crenate-toothed, glabrous above, somewhat canescent beueath, 

 [1-ribbed, piuuately veined]; i;mbels axillary and terminal, few-flowered, 

 sessile; pedicels at length elongated; ovary with 3 protuberances. Bushy 

 woods near Monterey, California. March. — A shrub about 6 feet high, 

 rigid, intricately branched, almost spinose. Leaves about half an inch 

 long, sometimes nearly obcordate; teeth conspicuous; the veins, etc., as 

 in the preceding. Clusters of flowers composed of several small crowded 

 umbels; the pedicels gradually elongating to the length of 3-4 lines. 

 Calyx and corolla bright blue." Nuttall. — Resembles the last two species 

 in many respects.— Torr. & Gray, Fl. N. Am., i, 268 (1838). 



Under this variety it seems best to include nearly all 

 the forms of the Cerastes section which have opposite 

 more or less dentate leaves and conspicuous warty stip- 

 ules as in typical C. verrucosus. Some of the forms 

 make a close approach to C cuneatus, while others con- 

 nect very closely with C . prostratus. No. 92, San Sim- 

 eon ; No. 93, Monterey (type locality): No. 94, Tamal- 

 pais; No. 106, Bolinas Heights; No. 112, San Pedro 

 Martir; No. 114, San Felipe Creek, Colorado Desert, 

 California. No. 107 (C. Veitchianus), hybrid with C. 

 thyrsijiorus. 



Var. GRANDiFOLius Torr. 



Ceanothus RIGIDUS var. grandifolius. Punta de los Reyes; A^jril 18. 

 The leaves are three times larger than in the ordinary form of this species, 

 and strongly spinose-toothed on the sides, as well as at the extremity. This 

 variety seems to show almost a transition to C. prostratus through the 

 broad-leaved form of that plant noticed below; but we are not willing to 

 unite the two species, without seeing a more extensive suite of specimens 

 for comparison. — Torr in P. R. R>, iv, 7o (1857). 



In Watson's Index this variet}^ is placed under C . crass- 



