182 THE AZALEAS OF NORTH AMERICA 



Rhododendron calendulaceum x viscosum. 



Such a cross is mentioned by Herbert (Amaryll. 360) in 1837: "I have raised 

 seedlings from Azalea Pontica-viscosa var. alba and Calendulacea-viscosa var. 

 rubescens." Nothing more, however, seems to have been published about the 

 latter cross; R. luteum x viscosum, see on page 178. 



Rhododendron molle x viscosum = Rhododendron viscosepalum 

 Rehder, comb. nov. 



Azalea viscosepala R. A. in Gard. Chron. II. 348 (1842). 

 Azalea viscocephala Arb. Kew. in Herb. Arnold Arb. 



In Gardener's Chronicle (1. c.) this is stated to have been raised by Mr. Waterer 

 at Knap Hill and is described as "Azalea viscosepala, white with yellow throat. 

 This is a cross between viscosa and Indica alba which latter it very much resembles 

 in foliage." 



I have before me specimens collected at Kew in 1880 as Azalea viscocephala 

 and specimens from plants growing at the Arnold Arboretum which probably 

 represent the same plant. They appear to be intermediate between R. viscosum 

 var. glaucum and R. molle. From R. viscosum they differ chiefly in the earlier 

 larger flowers with a yellow blotch, slightly yellowish in bud, with a stouter tube 

 more dilated above the middle, in the shorter stamens not or slightly exceeding 

 the lobes, in the more densely puberulous tube, in the tomentulose pedicels and 

 calyx and in the thinly pubescent under side of the leaves. From R. molle they 

 differ in the fragrant white flowers with a longer, more cylindric tube glandular- 

 pilose outside, in the glandular-pilose pedicels and in the smaller and broader 

 usually elliptic leaves glaucous beneath and only slightly pubescent. There is not 

 the slightest trace of Azalea indica alba, which is R. mucronatum, in the plant. 



Rhododendron viscosepalum var. Daviesii Rehder, comb. nov. 



Azalea Daviesii R. D. in Gard. Chron. ser. 2, XII. 200 (1879). 1 

 Azalea hybrida Daviesii Hort. apud Brettschneider in Gartenfl. XLII. 65, t. 

 1387 (1893). 



This form differs from R. viscosepalum chiefly in the larger flowers with a more 

 conspicuous yellow blotch and with a shorter, wider tube. The leaves are almost 

 identical in shape, color and pubescence. 



This hybrid was raised by Isaac Davies of Brook Lane Nursery, Ormskirk, 

 and is stated to have been "produced from A. sinensis crossed with a hardy white 

 Azalea " and the flowers are described as pale sulphur yellow, changing to white 

 immediately they are fully expanded, and deliciously sweet-scented. A form 

 "Avalanche" is mentioned, produced from the same cross and similar but with 

 pure white smaller flowers. This must be very similar to A. viscosepala. 



Very similar to var. Daviesii are the following forms: 



Azalea altaclarensis Gowen apud Lindley in Bot. Reg. XXVIII. t. 27 (1842), 

 not Rhododendron altaclarense Lindl. 



This handsome hybrid was raised at Highclere by J. R. Gowen, who states 

 that "it was produced by fertilizing the flowers of Azalea sinensis with the pollen 



1 Not to be confused with R. Daviesii Dean, Floral Mag. n. ser. XX. t. 474 

 (1881), a hybrid of R. javanicum and R. retusum. 



