152 JOURNAL OF THE ARNOLD ARBORETUM (vol. v 



the petals varying between 1 cm. and 1.5 cm. in length, in the density of 

 the inflorescence which may be very crowded with short pedicels 2-3 

 mm. long or slenderer, the lowest pairs of flowers about 2 cm. distant and 

 the pedicels up to 6 mm. long, as in Hers' no. 1476 and in Purdom's no. 

 369, and in the pubescence of the leaves which may be perfectly glabrous 

 or more or less bearded in the axils of the veins beneath and ciliate with 

 long white hairs near the base; the specimen from Shensi is even more 

 pubescent; the lower leaves are setose-pilose along the veins and even 

 sparingly so on the under surface, the upper leaves which are rather nairovv 

 are nearly glabrous. The leaves also vary in size and somewhat in shape, 

 being sometimes, particularly on vigorous shoots, rounded or nearly sub- 

 cordate at base as in nos. 2225, 2642 and 270 k 



These specimens with rounded to subcordate leaves make it probable 

 that P. rvhricaulis Carriere (in Rev. llort. 1870-71, 460 [1871]) belongs 

 here, the description, incomplete as it is, agrees well with P. pekinensis, 

 but the description of the leaves as " cordif ormes " seemed to be against 

 this identification; the plant described was raised from seed sent by E. 

 Simon from China, and probably from Peking from where he introduced 

 a number of other plants to France. 



Philadelphus pekinensis var. dasycalyx Rehder in Jour. Arnold Arb. 1. 

 197 (11)20).— Hers in Jour. N. China Branch R. As. Soc. liii. 113 (1922); 

 Liste Ess. Lign. Honan, 20 (1922). 



Honan: Hwei hsien, Shansi border, J. Hers, no. 713, June 19, 1919. — 

 See also Rehder, 1. c, and Hers, 1. c. 



Shansi: Nan Yang shan, alt. 1500 2500 m., J. Hers y no. 2729, September 



22-30. 1923. 



The specimen from Shansi differs from the type in the broader ovate 

 leaves mostly rounded at base and in the elongated inflorescence, the low- 

 est pairs of flowers being 2.5 15 cm. distant. 



Philadelphus laxiflorus, sp. nov. 



Frutex 2- 3-metralis; cortex ramulorum biennium cinereo-brunneus 

 vel fere castaneus lamellis tenuibus solubilis; ramuli juveniles fusci glabri. 



Folia (ramulorum florentium tantuni adsunt) elliptico-ovata vel elliptico- 

 oblonga, 3-5.5 cm. longa et 1.6 2.5 cm. lata, acuminata, basi late cuneata, 

 supra obscure viridia pilis brevibus setosis satis dense obtecta, subtus 

 glaucescentia, ad venas primarias sparse setoso-pilosa et in axillis pilis 

 longis albidis barbata, ceterum glabra, margine setoso-eiliolata et minute 

 remoteque denticulata denticulis ad mucronem callosum reductis; petioli 

 circiter 5 mm. longi, glabri vel sparsissime pilosi. Racemi (5 12 cm. longi, 

 laxi, 9- 11-flori, axi glabro, ramulos plerosque foliorum paria tria ex quibus 

 duo florifera gerentes terminantes; j)edicelli inferiora 6-8 mm. longi, ceteri 

 apicem versus decrescentes; sepala elliptico-ovata, 7 mm. longa, acuminu- 

 lata,extus ut ovarium campanula turn 4 mm.longum glabra, intus marginem 

 et apicem versus tomentosa, medio glabrata; petala ovali-orbicularia, 1.(5 



