HYBRIDS 181 



The two varieties figured, one with white flowers flushed pink (Verna Berger) 

 and one with deeper pink flowers (Schone von Giessen), were raised from seed of 

 R. occidentale, the other parent not being stated in the text, but on the plate the 

 hybrid is called Azalea occidentale x arborescens x mollis. I have not seen any of 

 these forms. 



Rhododendron calendulaceum x occidentale. 



A hybrid between these two species has been raised at the Arnold Arboretum 

 by W. H. Judd in 1915, and one plant flowered in 1920 for the first time, bearing 

 only a single inflorescence with white flowers suffused with pink and marked with a 

 large orange blotch on the upper lobe. 



Rhododendron arborescens x calendulaceum = R. Anneliesae 



Render, hybr. nov. 



Rhododendron arborescens x calendulaceum Zabel in Beissner, Schelle & Zabel, 

 Handb. Laubholz-Ben. 380 (1903), name only. 



This hybrid originated accidentally at the Arnold Arboretum and was raised 

 probably in 1896 from seed of R. calendulaceum or R. arborescens collected in the 

 Arboretum. It is exactly intermediate between R. calendulaceum and R. arbor- 

 escens and I have little doubt that it is a hybrid between these two species. The 

 first flowers of R. arborescens are usually just beginning to open about the middle 

 of June when late blooming forms of R. calendulaceum bear the last flowers; and 

 with dichogamous plants this is just a favorable condition for cross-fertilization. 

 From R. calendulaceum it differs chiefly in the glaucous and glabrous under side of 

 the leaves, only the midrib being furnished with strigose hairs and slightly pubes- 

 cent toward the base, in the very sparingly hairy branchlets and in the longer corolla- 

 tube of the pinkish white fragrant flowers marked with a large yellow blotch and 

 in the style puberulous only near the base. From R. arborescens it differs in the 

 slightly pilose and slightly puberulous branchlets, glabrescent toward the base, 

 in the pubescent and strigose midrib of the under side of the leaves, in the 

 large yellow blotch on the upper lobe of the pinkish white flowers, in the shorter 

 ovate calyx-lobes and in the style being puberulous near the base. 



It is a shrub of vigorous habit, very handsome in flower with its large fragrant, 

 pinkish white flowers marked with a conspicuous yellow blotch; the pinkish corolla- 

 tube is rather densely furnished with short glandular hairs and the style is purple 

 toward the apex. The leaves are elliptic or broadly elliptic and somewhat bluish 

 green above. 



This hybrid is named for my wife. 



Rhododendron speciosum x molle. 



Azalea marginata Paxton in Paxton's Mag. Bot. II. 121, t. (1835). 



Azalea sinensis coccinea Cunningham Msc. ex Paxton, I. c. (1836), as synon. 



The plant is stated to be "a hybrid produced from A. coccinea fertilized with the 

 pollen of A. sinensis. The size of the flowers and the foliage with the entire habit 

 of the plant is quite like that of the A. sinensis with the exception of the color 

 which differs only in the light orange-red margin of the corolla." The hybrid was 

 raised by Mr. Cunningham of Comely Bank near Edinburgh, in whose collection 

 it flowered February, 1835. The parentage given is probably correct as far as can 

 be judged from the colored plate. 



