1921) REHDER, NEW SPECIES. VARIETIS AND COMBINATIONS 87 



correct name, for Schmidt's A. hybrida though the next oldest name 

 and accompanied by a good colored plate, cannot be transferred to Pru- 

 nus on account of Prunus hybrida Quetierii Carr. apud Mouillefert, Arb. 

 Arbriss I. 401 (1895), a supposed hybrid between Prunus Armeniaca L. 



and P. Persica Batsch. 



Prunus amygdalo-persica is very handsome on account of its large and 

 showy pinkish flowers; it has proved perfectly hardy at the Arnold Ar- 

 boretum and flowers profusely almost every year, while the forms of 

 P. communis Arcang. are not hardy in this Arboretum. 



Prunus argentea, comb. nov. — Amygdalus orientalis Miller, Gard. 

 Diet. ed. 8 (Amygdalus No. 3) (1759). — Amygdalus argentea Lamarck 

 Encycl. M6th. i. 103 (1783). — Prunus orientalis Koehne, Dendr. 315 

 (1893), not Walpers. 



As Koehne 's combination is preoccupied by P. orientalis Walpers 

 (Rep. ii. 911 [1843]) based on Cerasus orientalis Spach (in Ann. Sci. Nat. 

 s&r. 2, xix. 128 [1843]), the Amygdalus orientalis Mill, if referred to the 

 genus Prunus must receive another specific name and for this its later 

 synonym A. argentea is available. In the Index Kewensis Prunus orien- 

 talis Walpers is referred as a synonym to P. microcarpa C. A. Mey., but 

 the descriptions of the two species differ in some important characters, 

 they are from different localities and Boissier refers C. orientalis Spach 

 only "ex parte" to P. microcarpa C. A. Mey. Specimens of P. micro- 

 carpa from the Caucasus collected by F. N. Meyer certainly do not agree 

 with Spach 's description of his Cerasus orientalis. 



Prunus glandulosa f. sinensis Koehne in Sargent PI. 

 (1912). — Add to the synonyms: Amygdalus pumila Linn 



Wilson 



Mant 



(1767). — Sims in Bot. Mag. xlvii. t. 2176 (1820). — Cerasus japonica 

 /3 multiplex Seringe in De Candolle, Prodr. II. 539 (1825), pro parte. 

 Cerasus chinensis G. Don, Gen. Syst. n. 514 (1832). — Cerasus japonica 

 2. multiplex Loudon, Arb. Brit. n. 706, fig. 415, 416 (1838). — Prunus 

 chinensis D. Dietrich, Syn. PI. in. 44 (1843). 



There are two older varietal names which are partly applicable to this 

 form, but both being doubtful, it seems best to retain the name proposed 

 by Koehne. The oldest of these varietal names is Amygdalus nana duplex 

 Weston, Bot. Univ. i. 7 (1770). Its English name is given as "Double 

 flowering dwarf Almond" which is without doubt the pink double-flowered 

 form of P. glandulosa well known in gardens at that time, but as the 

 Latin name is proposed as a variety distinguished from it only by the 

 phrase "flore incarnato pleno," of Amygdalus nana which is according to 

 the description A. nana L., an entirely different plant, it does not seem 

 advisable to accept the name on the strength only of the English name 

 cited and for the reason that no double-flowered form of A. nana L. is 



known. 



P 



inge in De Candolle, Prodr. n. 539 (1825). This belongs as regards the 



