1921| REHDER, NEW SPECIES, VARIETIES AND COMBINATIONS 43 



it antedates Lamarck's name by 10 years, its resurrection cannot be 

 avoided, though one has to concede that neither Hill's description nor 

 his figure are very good, but they are sufficient to identify the plant; 

 on the plate the leaves and the habit of the plant are fairly characteristic 

 and represent unmistakably the A. macrophylla Lam., but the flowers 

 show little resemblance to those of that species and look more like badly 

 drawn flowers of A. Clematitis L.; the author apparently had at his com- 

 mand only a specimen without well developed flowers and probably re- 

 constructed them on the lines of those of the well-known A. Clematitis. 



It may not be amiss to append here a note on another American shrub 

 figured by Hill on plate 18 of the same work. This is Viburnum, lanceo- 

 latum which is referred in Index Kewensis as a synonym to V. obovatum 

 Walt, and in Steudel's Nomenclator to V. laevigatum Ait., a synonym of 

 V. obovatum. If this identification were correct, then V. lanceolatum 

 first published by Hill in his Hort. Kew. 457, t. 19 (1768) would have 

 priority over V. obovatum Walter of 1788, but the figure published with 

 the original description, of which that in his Twenty-five new plants is 

 only an enlarged copy, represents without doubt V. nudum L. and there- 

 fore V. lanceolatum Hill becomes a synonym of that species. 



Hydrangea opuloides var. japonica Schneid. f. coerulea, comb. nov. — 



H. Belzonii Siebold & Zuccarini, Fl. Jap. i. 109, t. 55 (1840). — H. japonica 



var. /3. caerulea Hooker in Bot. Mag. lxxii. t. 4253 (1846). — H. Hor- 



tensia £. coerulea K. Koch, Hort. Dendr. 106 (1853). — //. japonica E. 



coerulescens Kegel in Gartenfl. 290 (1866). — H. Hortensia a. Belzonii 



Maximowicz in Mem. Acad. Sci. St. P6tersb. x. no. xvi. 14 (1867). — H. 



opulodes a. japonica f. Belzonii Voss, Vilmorin's Blumengart. I. 287 



(1894). — Schneider, 111. Handb. Laubholzk. I. 392 [opuloides] 1905).— 



Rehder in Bailey, Standard Cycl. Hort. in. 1621 (1915), as var. of //. 



opuloides. — H. hortensis var. Belzonii Rehder in Bailey, Cycl. Am. 



Hort. ii. 784 (1900). 



This blue-flowered form of H. opuloides var. japonica seems to be one 



of the hardiest forms of this species and is doing well on Long Island 

 where it is reported to be a great favorite in gardens. It is half-hardy 

 in the Arnold Arboretum, being killed back more or less every year, but 

 enough of the old wood is usually left to produce flowers which appear 

 at the end of lateral branchlets on the branches of last year. This and 

 H. opuloides rosalba Rehd. are the only forms fairly hardy in this Ar- 

 boretum; //. opuloides cyanoclada Dipp. persista, but does not flower. 



Vitis Slavinii (V. Lccontiana x vulpina), hyb. nov. 



Young branchlets glabrous or nearly so. Leaves orbicular-ovate in 

 outline, 8-14 cm. long and 8 or 9 to 13 cm. broad, deeply cordate at base 

 with a wide open sinus, 3-5-lobed, the lobes unequally coarsely dentate, 

 with broad triangular or rounded, acute or abruptly mucronulate teeth 

 much broader than long, the upper lobes broad-ovate or sometimes 



