1924] REHDER, NEW SPECIES, VARIETIES AND COMBINATIONS 239 



bination under Thea but which have already received a binominal under 



that genus I append the citations here. 



Thea gracilis (Hemsl.) Hayata in Icon. PL Formos. vi. Suppl. 9 (1917). 

 Thea lutchuensis (Ito) Matsumura, Ind. PL Japan, n. 361 (1912). 

 Thea confusa Craib in Kew Bull. Misc. Inform. 1914, p. 5. 



Of Camellia Costed Leveille in Fedde Rep. Spec. Nov. x. 148 (1911) 

 I have seen no specimens and as it is doubtful if the plant described by 

 Leveille belongs to this genus, I think it better to defer the coining of a 

 new combination until the status of this plant has been clearly established. 



Cornus dubia (C. amomum X paucinervis) , hybr. nov. 



Frutex ramis patentibus demum arcuato-dependentibus ; ramuli horno- 

 tini subteretes, apice tantum leviter angulati pilis ferrugineis arete ap- 

 pressis conspersi, supra purpurascentes, subtus virescentes, annotini 

 glabri. Folia ovato-lanceolata vel oblongo-lanceolata, 5-8 cm. longa et 

 1.5-3.5 cm. lata, acuminata, basi late cuneata vel cuneata, supra laete 

 viridia, lucidula, sparse appresseque pilosula, subtus pallide viridia, ad 

 costam sparse pilis appresis ferrugineis albidisque mixtis sparse et ad ve- 

 nas sparsissime instructa, in facie sparse pilis appressis albidis conspersa; 

 petioli 5-10 mm. longi, appresse breviterque pilosi. Corymbi longe pe- 

 dunculati, 5-7 cm. diam., laxe pilis albidis ferrugineisque conspersi; sepala 

 oblongo-lanceolata, glabrescentia, fere longitudine ovarii sericeo-pilosi; 

 petala lanceolata, 5 mm. longa; filamenta et stylus apice manifeste clavatus, 

 petalis circiter triente breviora. Drupa 6-8 mm. diam., appresse pilosula, 

 maturitate initio intense coerulea demum fere nigra vel purpureo-nigra; 

 putamen circiter 4 mm. altum et 4-5 diam., leviter compressum et leviter 

 sed distincte costatum. 



Specimens examined: Arnold Arboretum, no. 13456, A. Rehder, July 2 

 and September 12, 1923. 



This peculiar Cornus originated in the Arnold Arboretum apparently 

 from seed of C. paucinervis Hance. It is clearly intermediate between 

 this species and C. amomum Mill, and I have little doubt that it is a hybrid 

 between these two species. From C. paucinervis it is clearly distinguished 

 by larger and broader leaves with 3-4 not 2-3 pairs of veins, more distinctly 

 ferrugineous-pilose on the veins beneath and of thinner texture, by the 

 longer petioles usually 6-8, not 3-5 cm. long, and by the larger, more blue 

 and earlier ripening fruit with a distinctly ribbed, slightly compressed 

 stone and as broad or broader than high. From C. amomum it differs 

 chiefly in the less deeply purple-colored and less densely pubescent branch- 

 lets, in the narrower leaves much less ferrugineous-pubescent beneath and 

 with 3-4, not 4-6 pairs of lateral veins, in the smaller finally almost black, 

 never light blue or whitish fruit with a smaller less strongly ribbed stone 

 not or not much broader than high. 



This new hybrid forms a wide-spreading bush with slender branches and 

 produces in July its numerous corymbs on short branch lets along the arch- 

 ing branches; the fruits are profusely produced and of uniform dark blue 

 or nearly black color. 



