HYBRIDS 189 



Entdeck. II. 130 [1821]) is different from both, as he describes his plant as with 

 obtusish leaves pubescent on both sides, and it is doubtful if it belongs here at all. 

 Whether Hoffmannsegg's R. azaleoides (Verzeichn. 1826, 194) belongs here, I am 

 unable to say, as I have no access to that publication. Similar to R. azaleoides are 

 the following: 



Rhododendron gemmiferum Hort. apud Zabel in Beissner, Schelle & Zabel, Handb. 

 Laubholz-Ben. 379 (1903), name only. Bean, Trees & Shrubs Brit. Isl. II. 358 

 (1914). Rehder in Bailey, Hand. Cycl Hort. V. 2946 (1916). Millais, Rhodod. 

 172 (1917). 



Bean does not say anything about its parentage, but according to a plant culti- 

 vated at the Arnold Arboretum it seems to be little different from Andrew's plant 

 except that it has broader obtusish or acutish leaves slightly pubescent beneath 

 and when very young also above; the flowers are nearly glabrous outside. A cross 

 between R. roseum and R. catawbiense might produce a similar offspring. 



Rhododendron Gowenianum Sweet, Brit. Flow. Gard. III. t. 263 (1828). De 

 Candolle, Prodr. VII. 728 (1839). Bean, Trees & Shrubs Brit. Isl II. 344 

 (1914). 



Rhododendron nudiflorum 6. Govenianum G. Don, Gen. Syst. III. 847 (1834). 



Rhododendron nudiflorum x (catawbiense x ponticum) ex Sweet, I. c. 



This hybrid was raised in the collection of the Earl of Carnarvon at Highclere 

 by J. R. Gowen from seed of "A. nudiflora or viscosa . . . fertilized with the pollen 

 of a hybrid Rhododendron between R. ponticum and R. catawbiense." The leaves 

 are evergreen or scarcely deciduous, elliptic-oblong to lanceolate-oblong, pubescent 

 on both sides when young, glabrous above and glossy when old. The flowers are 

 light purple, rather small, with a comparatively long and narrow tube. From the 

 illustration it is impossible to judge whether R. nudiflorum or R. viscosum is one of 

 the parents; G. Don calls it a hybrid of R. nudiflorum and makes it a variety of 

 that species, but Bean says that it is very near his R. azaleoides which is referred 

 here to R. hybridum. 



Rhododendron Cartonianum De Candolle, Prodr. VII. 727 (1839). 

 "Carton's Rhododendron" Lindley in Bot. Reg. XVII. t. 1449 (1831). 

 Rhododendron nudiflorum W. Cartoni Sweet, Hort. Brit. ed. 3, 442 (1839). 

 Rhododendron Cartoni Bean, Trees & Shrubs Brit. Isl. II. 344 (1914). 

 Rhododendron nudiflorum x catawbiense ex Lindley, I. c. 



According to Gowen "ninety-seven plants were raised in the Highclere Garden, 

 in the year 1825, from a specimen of Azalea nudiflora purposely touched with pollen 

 of Rhododendron Catawbiense. They vary in habit in the size of the umbel and in 

 the deeper or fainter purple tint of the corolla." Lindley named the plant figured 

 "the finest of the above set of hybrids in compliment to the Gardener of the Earl 

 of Caernarvon, Mr. James Carton." 



The plant is very similar to that figured by Sweet as R. Gowenianum except that 

 the flowers are more white inside at the base of the limb. 



Rhododendron viscosum x maximum = Rhododendron hybridum 

 Ker in Bot. Reg. III. t. 195 (1817). x 



Rhododendron hybridum glaucum Herbert ex Sims in Bot. Mag. XLIX. sub t. 



2308 (1822), incidental mention. 

 Rhododendron bigener Hort. ex Steudel, Nomencl. ed. 2, II. 450 (1841). 



1 "Rhododendron hybridum Franch. Yunnan" enumerated by Vilmorin & 

 Bois, Frut. Vilmor. 175 (1904), is probably a mistake. I have been unable to find 

 any reference to such a name elsewhere. 



