200 JOURNAL OF THE ARNOLD ARBORETUM [vol. i 



densely grayish villous-pubescent beneath, leaves of shoots usually broadly 

 ovate, Avith 4-8 broad and rather shallow teetli on each side: flowers 3-4 cm. 

 across, in 5-13-, usually 7-9-flowered racemes 5-10 cm. long, usually the two 

 lower pairs in the axils of leaves and rather remote; lower pedicels 3-5 

 mm. long, pubescent; caljTC loosely pubescent outside; sepals oblong-ovate, 

 acuminate; petals elliptic-oblong, rarely elliptic; style divided about 



shorter than the stamens; stigmas slightly shorter and narrower than the 

 anthfcrs. 



1 



3' 



Arboret 



specimen 



July 3, 1917, preserved in herb. Arnold Arboretum). — To this hybrid 

 belong also plants received from Ellwanger & Barry, Rochester, N.Y., as 



P. 



ifol 



Weener, Germany, as P. Zeykeri in 1910, from Kew Gardens as P. cordi- 

 folhis in 1897. 



verrncosiis 



petal 



eels; from P. Gordomanus it is easily distinguished by the pubescent 

 caljTi and from P. puhescens by the bronmlsh bark, the smaller more coarsely 

 dentate leaves and the oblong-elliptic petals. 



X Philadelphus congestus, hybr. nov. (? P. laxus X verrucosus or P. 

 Gordoiianus). 



Shrub with slender spreading branches; bark of last year's branchlets 

 chestnut-brown, exfoliating; young branchlets strigose: leaves of flowering 

 branchlets narrowly elliptic to elliptic-lanceolate, more or less curved and 

 pendent, 3-4 cm. long, minutely and sparingly denticulate, sparingly 

 strigose-pubesccnt beneath, those of the shoots elliptic-ovate, broadly cu- 

 ncate at the base, 4-G cm. long, coarsely dentate, strigose-pubescent on both 

 sides, more densely so beneath, 3-nerved at the base; flowers about 3 cm. 

 across, usually 5, rarely 3 or 7, in short and dense racemes about 3.5 cm. 

 long; pedicels 2-4 mm. long, strigillose; calyx-tube strigose at the base and 

 usually sparingly strigose along the 4 stronger ribs; sepals oblong-ovate, 

 acuminate; petals oval; style shorter than stamens, divided about |; the 

 stigmas longer and nearly as broad as the anthers. 



Cultivated at the Arnold Arboretum under No. 5854, received from 

 Spaeth's Nursery near Berlin, Germany, in 1908 .as P. inodorus speciosiis 



difl 

 Arnold Arboretum.) 



1912, preserved in herb. 



In habit and in the shape aad pubescence of the leaves this hybrid re- 

 sembles P. laxus, but the racemose flowers, the ratlier coarsely dentate 

 leaves and their more copious pubescence and the slightly pubescent 

 calyx indicate the influence of P. verrucosus^ or possibly of P. Gordomanus 

 var. columbianus, but the latter would not explain the pubescence of the 

 calyx. A form of apparently similar origin, but with larger flowers and 



^ According to Schelle (in Beissner Schclle & Zabel, Handb. 129) the plant of this name 

 from "Hort. Spaeth" belongs to P. umhellatus. 



