138 THE AZALEAS OF NORTH AMERICA 



Rhododendron nudiflorum var. glandiferum Rehder, comb, nov. 1 



Azalea nvdiflara glandifera Porter in Bull. Torr. Bot. Club, XXVII. 508 (1900); 

 Fl. Pennsylv. 238 (1903) . — Keller & Brown, Handb. Fl. Phila. 246 (1905). — 

 Stone in Ann. Rep. N. Jersey State Mus. 1910, 613 (1911). 



This variety differs from the type in having the pedicels and the outside of the 

 corolla-tube furnished with more or less numerous gland-tipped hairs of usually 

 nearly equal length, and the color of the corolla is usually of a deeper pink or 

 carmine color. The variety was based originally on specimens collected in eastern 

 Pennsylvania, but it is found frequently within the range of the type from Massa- 

 chusetts to northwestern South Carolina and often grows together with the typical 

 form. It seems, however, nearly absent from the southeastern part of the range, 

 that is from the coastal plain from New Jersey to North Carolina and more common 

 West, for the plants I have seen from the extreme Western localities, western Ten- 

 nessee and southern Ohio, represent this variety though from the last named local- 

 ity (Lawrence County) and from western New York (Monroe County) I have 

 seen specimens of the typical form. 



A form with double flowers is mentioned by Pursh {Fl. Am. Sept. 152 [1814]) 

 under his A. periclymenoides, but he does not state where he saw it. In 1826 Sweet 

 enumerated a double white form (Azalea nudiflora p. albo-plena Sweet, Hort. Brit. 

 265 [1826]), name only. — Rhododendron nudiflorum 0. albo-plenum Sweet, Hort. 

 Brit. ed. 2, 343 (1830) and a semi-double white form (Azalea nudiflora w. semi- 

 duplex Sweet, Hort. Brit. 265 [1826]. — Rhododendron nudiflorum w. semiduplex 

 Sweet, I. c. ed. 2, 344 [1830]), also a double purple form (Azalea nudiflora SS. pur- 

 pureo-plena Sweet, I. c. 265 [1826]. — Rhododendron nudiflorum 53. purpureo-plenum 

 Sweet, I. c. ed. 2, 344 [1830]) and a double red form (Azalea nudiflora kk. rubro- 

 plena Sweet, I. c. 265 [1826]. — Rhododendron nudiflorum kk. rubro-plenum Sweet, 

 I. c. ed. 2, 344 [1830]). Probably Azalea nudiflora flore pleno Loddiges Cat. 1836 

 (ex Loudon, Arb. Brit. II. 1142 [1838]) is the same as the double white form of 

 Sweet. Two different forms Azalea periclymenoides "alba pleno" and "rubra 

 pleno" were offered in 1831 by R. Carr (Cat. Am. Trees Bartram Bot. Gard. 64). 

 All the double-flowered forms in cultivation which I have seen seem to be of 

 hybrid origin, but from Kew Gardens I have seen a specimen collected by 

 G. Nicholson in 1880 as Azalea " Double Blush " which is probably a double- 

 flowered R. nudiflorum; it has the leaves perfectly glabrous beneath except the 

 strigose midrib and the corolla is pilose and villose outside but not glandular. 



Several other varieties and forms have been described or mentioned by Alton, 

 Loddiges and others, but as the descriptions are inadequate and I have not seen 

 the type specimen or other reliable material of them, I am in doubt whether they 

 belong here or to R. roseum or to R. canescens; they will therefore be enumerated 

 under the doubtful names. 



Rhododendron roseum Rehder, comb. nov. 



Azalea rosea Loiseleur-Deslongchamps in Duhamel, Traiti Arb. Arbust. 

 ed. 2, V. 224, t. 64 (1812). — ? Michaux, Journal, ed. C. S. Sargent, 111 (in 

 Proc. Am. Philos. Soc. XXVI. (1889)). 



1 Azalea nudiflora rubra Loddiges, Bot. Cab. I. t. 51 (1817). — De Candolle, 

 Prodr. VII. 717 (1839), as var. — Rhododendron nudiflorum var. rubrum Sweet, 

 Hort. Brit. ed. 2, 343 (1830); G. Don, Gen. Syst. III. 847 (1834) is probably identi- 

 cal with this variety, judging from Loddiges' figure, but as long as one cannot be 

 positively sure I prefer to keep Porter's name. 



