ENUMERATION OF THE SPECIES 127 



species. It exhibits a remarkable latitude in the time of blooming; I have before 

 me a specimen collected by Orcutt in San Diego County in April without any leaf 

 buds developed and in northern California I collected it myself in full bloom as 

 late as August 25 with the winter-buds of the new growth fully developed; gen- 

 erally it flowers between the middle of June and the middle of July, just when 

 the young leaves are fully grown. The autumnal tints of this species are very 

 brilliant. In Garden and Forest (III. 626 [1890] ), E. W. Hammond says "in the 

 fall of the year its leaves glow with such a profusion of scarlet and crimson mingled 

 with the gold and green, that it produces the most delightful effects." 



Behr (Fl. Vicin. San Francisco, 173) states that the root contains a powerful 

 narcotic, and according to Jepson (FL W. Middle Calif, ed. 2, 311) the plant is 

 feared by sheepmen as poisonous. 



Rhododendron occidentale was introduced into cultivation by William Lobb, who 

 sent seeds from California about 1850 to the Veitchian Nurseries, where it flow- 

 ered in 1857. It is tenderer than many other American Azaleas and has not 

 proved hardy at the Arnold Arboretum. 



Rhododendron occidentale var. sonomense Rehder, var. nov. 



Rhododendron sonomense Greene in Pittonia, II. 172 (1891). Zabel in Mitt. 

 Deutsch. Dendr. Ges. XI. 29 (1902). Millais, Rhodod. 245 (1917). 



This variety differs from the type according to Greene chiefly in its smaller 

 narrower leaves, smaller rose-colored and very fragrant flowers; the odor of typical 

 R. occidentale is mephitic according to Greene. It occurs on dry slopes in the 

 mountains of Sonoma County. It does not seem to be in cultivation outside of 

 California. 



Rhododendron calendulaceum Torrey, Fl. U. S. 425 (1824). 

 G. Don, Gen. Syst. III. 847 (1834). Bigelow & Hor, FL Lancast. 56 

 (in Trans. Med. Convent. Ohio) (1841); Reprint, p. 10 (1841). Gray, 

 Syn. Fl. N. Am. II. 1, 41 (1878). Dippel, Handb. Laubholzk. I. 413, 

 fig. 266 (1889). Millspaugh/Preftm. Cat. Fl. W. Va. 402 (1892). 

 Blake in Rhodora, XX, 53 (1918). 



Azalea lutea Linnaeus, Spec. 150 (1753), only as to Colden's synonym. 

 Weston, Bot. Univ. I. 16 (1770). Michaux, Jour. ed. C. S. Sargent, 

 111, 116 (in Proc. Am. Philos. Soc. XXVI.) (1889). Britton & Brown, 

 III. Fl II. 559, fig. 2745 (1897). Gattinger, Fl. Tenn. 131 (1901). 

 Britton, Man. 698 (1901). Porter, FL Pennsylv. 238 (1903). Mills- 

 paugh, Liv. Fl. W. Va. 323 (W. Va. Geol. Surv.) (1913). Small, Fl. S. E. 

 U. S. 883 (1903); in N. Am. FL XXIX. 41 (1914). Shreve & others, PL 

 Life Maryland, 466 (1910). Schaffner, Cat. Ohio Vase. PL 204 (in Ohio 

 Biol. Surv. I.) (1914). Griggs, Bot. Surv. Sugar Grov. Reg. 328 (Ohio BioL 

 Surv. I.) (1914). Taylor, FL Vicin. N. Y. 489 (in Mem. N. Y. Bot. 

 Gard. V.) (1915). 



Azalea nudiflora Linnaeus, Spec. ed. 2, 214 (1762), as to Colden's synonym only. 



Azalea flammea Bartram, Travels, I. 327 (1791), name only. 



Azalea calendulacea Michaux, FL EOT. -Am. I. 151 (1803), excluding var. a. 

 Pursh, FL Am. Sept. 151 (1814). Elliott, Sketch Bot. I. 238 (1821), ex- 

 cluding var. a. and c. De Candolle, Prodr. VII. 717 (1839). Gray, 

 Man. 268 (1848) ; ed. 5, 299 (1872). M. A. Curtis, Descript. Trees & Shrubs, 

 98 (in Geol. Nat. Hist. Surv. N. Car. III. Bot.) (1860). 



