1920] EEHDER, NEW SPECIES, VARIETIES AND COMBINATIONS 209 



morphological differences. The most striking difference consists in the 

 pubescence of the calyx which is quite destitute of central rays in the va- 

 riety, while in the type it is nearly villous from the numerous spreading 

 central rays. The central rays of the stellate hairs on the under side of 

 the leaves which are well developed in the type, are less numerous in the 



y and disappear toward the margin. In the length and shape of the 

 lobes there is no difference. The petals are much broader, about 



lyx 



11 mm. broad, though scarcely longer than in the larger-flowered form of 

 the type. The teeth of the outer stamens equal or exceed the anthers, 

 while in the type they are shorter. 



Deutzia longifolia Franch, f. elegans, forma nov, 



A typo recedit ramis gracilibus arcuatis paniculas numerosas satis laxas 

 ramulos breves subaequilongos terminantes gerentibus corolla extus pur- 

 pureo-rosea fere 2 cm. diam. 



This handsome form of D, longifolia is characterized by slender arching 

 branches studded almost their whole length with rather loose panicles of 

 rose-purple flowers borne on short branchlets of nearly equal length; the 

 panicles are about 5 cm. long and broad, and the flowers nearly 2 cm. across 

 on pedicels 4-8 mm. in length. The flowering branchlets bear 3-4 pairs 

 of lanceolate leaves 3-5 cm. long and 1-2 cm. broad and covered with a 

 close white tomentum beneath; the leaves of the shoots are similar, but 

 7-11 cm. long and 2-3.3 cm. broad. 



This is one of the handsomest forms of D, longifolia; the flowers are not 

 as large as those of var. Veitchii^ but the habit is more graceful, and the 

 plant has proved hardier at the Arboretum than other forms of the species. 

 It was raised from seed sent by Mr. Wilson in 1908 from Wa-shan in 

 Szechuan. As a botanical form it is of Jittle significance, but from a hor- 

 ticultural point of view it certainly is worth noting. 



X Deutzia Wilsonii Duthie in Bot. Mag. cxxxii. t. 8083 (1906). — Z). 

 discolor X viollis Rehder in Sargent, PI. Wilson, i. 20 (1911). 



When I published my synopsis of the Chinese Deutzias in Plantae Wil- 

 sonianac, I only know Z>. Wilsonii, which is based on a cultivated plant, 

 from the description and the plate in the Botanical Magazine. Since then 

 Mr. Wilson has collected specimens in the Veitchian Nursery from the type 

 plant, and a plant received from Veitch is now growing at the Arnold Ar- 

 boretum. A close examination of this material shows that D. Wilsonii is 

 a hybrid of apparently the same origin as the specimen I described as D. 

 discolor X mollis. At the first glance D, Wilsonii looks quite different; the 

 flowers are much larger and have well developed anthers; the leaves are 

 larger and in shape more like those of D. discolor, but the pubescence of the 

 under side of the leaves shows the same intermediate character between 

 that of Z). discolor and Z). mollis. The serration, too, of the leaves, the 

 denser pubescence of their upper surface, and the shorter and stouter 



w 



petioles show the influence of D. mollis. Still more clearly is the hybrid 

 character of the plant shown by the aestivation of the flowers which is 



