i2 JOURNAL OF TIIE ARNOLD ARBORETUM [vol. n 



NEW SPECIES, VARIETIES AND COMBINATIONS FROM THE 

 HEREARTl M AND THE COLLECTIONS OF THE ARNOLD 



ARBORETUM ' 



Alfred Reiidek 



ROSACEAE {contiuui'd) 



Sorbus L. 



X Sorbus amoldiana, hyhr. nov. ( = S. Aucvpana x di.scolor) 



Arbor pyramidalis ramis suberectis vel crecto-patentibus; raniuli juniores 

 fere glabri vel sparsissiine villosi; gemmae fusco-j)Tirp\ireae, margine perii- 

 laruin douse et loiige ciliato et ai)ice barbato exccptis gla})rae vel sparse 

 louge ])iU)sae. Folia 6-7-jiiga; foliola angiistc oblonga, acuta, basi oblique 

 late cuneata vel fere rotundata, 3-5 em. louga el 0.8 1.4 cm. lata, basis 

 quarla parte iiiferiore plerumque excepta argute serrata vel interdum ad 



medium, rarius ultra iulegra, supra glabra, laete viridia, subtus initio 

 sparse, ad costam densius villosa, maturitate glabra vel secus costam 

 sparse villosa, glaueesccutia; petioli 1.5-2.5, rarius 3 em, longi, ut rhachis 

 puri)urascentes et initio sparse villosi, mox glabri; stipulae 5 8 mm. longae, 

 digitate -incisae, pleraeque persisteutes. Coryml)i eireiter 10 cm. diam., 

 satis densi, rhachi et ramulis sparse villosis; flores 8 10 nm:i. diam.; petala 

 ovalia vel late ovala, 3.5-4 mm. longa; stamina petalis subaequilonga; styli 

 3-4. Fructus subglobosi vel subi)yriformes, 7-9 mm. diam., rosci; rhachis 

 et ramuli iuflorescenliae glabri et purpurascentes. 



Cultivated at the Arnold Arboretum (raised from seed of S. discolor Maxim, in 

 1907); specimens eollceted May IG and September 26, 1918, A, Rchdcr (type). 



This new hybrid was raised at the Arnold Arboretum in 1907 from seed 

 colleeled from a tree of S. discolor Maxim. (S. 'pelcincn.sis Koehne) received 



in 1902 from the nursery of C. Gebbers, Wiesenburg, Germany. It differs 



from S, discolor in the ]>ubescence of the under side of the young leaflets, 

 the smaller sti])ules, the shorter petioles, the denser villose inflorescence 

 and in the i>itdv fruits; from S. Aucnparia which is ai)])arently the other 

 parent it may be distinguished by the narrower leaflets, the larger, deei)ly 

 incised and j)artly jHTsistent stij>ules, the glabrous or glabrescent winter- 

 buds and by the pink fruit. As it gro^^s in the Arboretum it is a handsome 

 l)yrami(lal tree of vigorous growth now G or 7 m. tall and attractive in spring 

 with its numerous dense clusters of white flowers, and in autuuui remark- 

 able for the light pink color of its fruits. 



Aronia Pers. 

 Aronia arbutifolia Ell. f. leiocaljrx, formte nov. 



A tyjx) recedit calyce i)edicelloque glabris vel fere glabris. — Folia obo- 

 vata vel obovato-oblonga, subito acuminata, 4-6.5 cm. longa et 1.7-3.8 



* Continued from vol. i, p. 2(>8. 



