1920] EEHDER, NEW SPECIES, VARIETIES AND COMBINATIONS 123 



viridia, subtus ad costa densius, ad nervos sparsius pilosa, ceterum glabra, 

 sed glandulis fuscis conspersa; petioli pubescentes, 1-1,5 cm. longi. Racemi 

 multiflori, pedunculo bracteis foliaceis instructo incluso 5-6 cm. longi, pu- 

 bescentes; pedicelli sparse pubescentes, inferiores 0.6-1 cm. longi, apicem 

 versus decrescentes, bracteis dimidium pedicellum plerisque superantibus 

 lanceolatis v. lineari-lanceolatis glanduloso-denticulatis inferioribus saepe 

 latioribus et foliaceis sufTultl; calyx extus sparse pilosus, lobis triangularibus 

 sparse glanduloso-denticulatis tube paullo brevioribus; petala oblongo-obo- 

 vata, circiter 7 mm. longa; stamina petalis et stylo paullo longiora. Fructus 

 ignoti. 



Cultivated at the Arnold Arboretum (raised from seed collected by F. N. Meyer 

 in northern Korea in 190G and received from the U.S. Department of Agriculture 

 under No. 20084 [F. N. Meyer, No. 352a]); specimens collected, May 18, 1918, 

 and June, and September 14, 1920. 



Prunus Meyeri seems in all its characters intermediate between P. 

 Maackii Rupr. and P. Maximowiczii Rupr. and is probably a hybrid be- 

 tween these species, both of which grow in northern Korea and in the same 

 regions, as specimens collected by Mr. Wilson on the Tumen-Yalu divide 

 on two subsequent days show. From P. MaacHi the supposed hybrid is 

 easily distinguished by the darker and close, not flaky, bark, by the much 

 coarser and double serration of the leaves with acute, not setosely acuminate 

 teeth, by the longer peduncles furnished with bracts, the much larger 

 bracts at the base of the pedicels and by the shorter style. From P. Max- 

 imowiczii it differs chiefly in the lustrous orange-brown bark of the 

 branches, in the larger leaves glandular-punctate beneath, in the many- 

 flowered racemes with smaller and narrower bracts, in the smaller flowers 

 and in the less densely pubescent calyx and pedicels. If this Prunus really 

 is a hybrid, it is like the preceding a hybrid between species of two differ- 

 ent subgenera, for P. Maximowiczii belongs according to Koehne to the 

 subsect. Phyllomahaleb of the subgen. Cerasus, w^hile P. Maackii belongs 

 to the Ser. Maackiopadus of the subgen. Padus, though the two groups 

 may be more closely related in spite of Koehne's classification. 



Our tree which is now about 6 meters tall with a trunk 12 cm. in diameter 

 has flowered well for several years, but has so far produced no fruits and iu 

 this respect resembles P. Maackii which in this Arboretum fruits very 

 sparingly while P. Maximowiczii is usually w^ell covered w4th its purple- 

 black lustrous fruits. Though its flowers are not conspicuous P. Meyeri is a 

 desirable ornamental tree on account of its vigorous growth, its dense pyra- 

 midal habit and its pleasing bright green foliage. The orange-brown 

 lustrous bark of its limbs and branchlets make it attractive in winter. 



Prunus Padus L. var. laxa, var. nov. 



A typo varietatis recedit ramuhs gracilibus laxe pendulis folius angusti- 

 oribus plerisque obovato oblongis, axillis nervorum subtus ebarbatis, race- 

 mis laxis pendulis, putamine minore laeviore vix foveolato, — Arbor 

 glabra ramis patentibus, ramulis junioribus basi tantum minute puberulis: 



folia pllintiPO-nbnvRta v. oblnnfro-obovata. 5-10 cm. lomra et 3-4.5 cm, V. 



