m JOURNAL OF THE ARNOLD ARBORETUM [vol. hi 



variety described above. The only specimens I have seen which agree 

 exactly with Blume's description are specimens from trees cultivated at 

 Kew, Segrez and in the former Ellwanger and Barry \s nursery at Rochester, 

 New York; the tree growing in this Arboretum has the petiole, midrib and 

 veins glabrous, though it was raised from seed of the Rochester tree. 



A plant received in 1913 from the nursery of II. A. Hesse in Weener, 

 Germany, as A. chinensis has the leaflets densely pubescent beneath and 

 belongs apparently to the variety here described. 



Zizyphus jujuba Mill. var. inermis, comb. nov. — Z. vulgaris var. 

 inermis Bunge in Mem. Sav. Etr. Acad. Sci. St. Petersb. n. 88 (Enum. 



PL Chin. Bor. 14) (1833). — Z. saliva var. inermis Schneider in Sargent, 

 PL Wilson, ii. 212 (1914). 



The oldest name under the genus Zizyphus of the tree named by 

 Linnaeus Rhamnus Zizyphus is Zizyphus jujuba Miller (Gard. Diet, n* 

 no. 1 [1768]), which antedates Z. saliva Gaertner (1788) and Z. uvlgaris 

 Lamarck (1789). The name for the species called by Lamarck Z. jujuba 

 becomes Z. mauriiiana Lamarck (Encycl. Melh. ill. 318 [1789]) which 

 must be considered conspecific; the chief differences Lamarck gives 

 "feuilles moins larges, fruits oblongs et pointus" are scarcely of specific 

 value, for the size of the leaves varies greatly in the species and the fruits 

 though usually subglobose are occasionally oblong and pointed as in 

 Merrill's No. 2779 from the Philippines. It certainly is unfortunate 

 that the name used for more than one hundred years in Lamarck's sense 

 should be transferred to another species, but I do not sec how this can be 

 avoided under our rules of nomenclature. Miller's name Z. jujuba is 

 the oldest name for Rhamnus Zizyphus L. under Zizyphus and when 

 Lamarck transferred Rhamnus jujuba L. to Zizyphus his combination 

 cannot be considered valid on account of the earlier homonym of Miller. 

 Miller could not use the specific name given by Linnaeus, as it duplicated 

 the generic name, and being at liberty to choose any other name he chose 

 the name used by older authors for the same plant; as his species are not 

 based on those of Linnaeus' Species plantarum he was under no obliga- 

 tion to accept the specific name jujuba for the same species as Linnaeus 

 did under Rhamnus, a species not mentioned at all in Miller's enumeration 

 of the species of Zizyphus. 



Alaternus f. argenteo-varieEata, comb. nov. — Rhamnus- Alater- 



Rhamnus Alaternus f. argenteo-variegata, comb, now— 

 nus communis 3. argenieo-variegatus Weston, Bot. Univ. i. 237 (1770). — 

 Rhamnus alaternus var. 6. albo-variegatus Dumont de Courset, Bot. 

 Cult. ed. 2, v. 259 (1811). — Rhamnus Alaternus c. foliis argenteis Loudon, 

 Arb. Brit. n. 530 (1838). — Rhamnus Alaternus var. variegata Bean, Trees 

 & Shrubs Brit. Isls. n. 330 (1914). 



This form which is apparently an old inhabitant of gardens is figured 

 by F- Schmidt (Oesterr. Baumz. in. t. 156, upper figure [1800]); it has 

 leaves bordered with a broad irregular white margin. A similar form, 



