19241 REHDER, LIGNEOUS PLANTS OF NORTHERN CHINA, II 153 



cm. longa, stamina 30-35, 6-10 mm. longa, longiora stylum et dimidiam 

 partem petalorum superantia; discus satis planus, glaber; stylus 8 mm. 

 longus, glaber, ad medium divisus; stigmata antheris angustiora et secus 

 marginem exteriorem eis paullo longiora. 



Shensi: valleys of Tai pei shan, W. Purdom, no. 439, June 30, 1910. 



This species seems most nearly related to P. pekinensis Rupr. and P. 

 nepalensis Koehne, but from both it is readily distinguished by the short- 

 pilose and scabrid upper surface of the leaves and the deeply divided style, 

 also by the longer and looser inflorescence with 9 to 11 flowers and by the 

 larger flowers. In the pubescence of the leaves it resembles P. sericanthvs 

 Koehne, but that species has a pubescent calyx and the style divided 

 only at the apex. Philadelphia laxiflorus is without doubt a very orna- 

 mental species, but has not yet been introduced into cultivation. 



Philadelphus incanus Koehne in Gartenfl. xlv. 562 (1896), excl. no. 

 8823 Henryi.— Hers in Jour. N. China Branch R. As. Soc. liii. 113 (1922); 

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



Philadelphus subcanus Hers in Jour. N. China Branch R. As. Soc. liii. 113 

 (1922); Liste Ess. Lign. Honan, 20 (1922).— Non Koehne. 



Honan: Yung ning, Tsi li ping, about 1100 m., J. Hers, no. 402, May 22, 

 1919; Tsi yuan hsien, Tien tan shan, J. Hers, no. 1783, September 21, 

 1921 (sterile); Sung hsien, San kuan miao, J. Hers, no. 542, May 24, 1919; 

 Lushih, Tung ho, alt. 1000 m., J. Hers, no. 985, October 14, 1919.— See 

 also Hers, 1. c. 



Shensi: Kan y san, Kin qua san and Lao y san, G. Giraldi, June 12, 

 July 10 and September 6, 1897. 



Distribution: also Ilupeh. 



The specimens under no. 542 and no. 985 differ in their less pubescent 

 leaves from the type and had been tentatively referred to P. subcanus. 

 but the character of the pubescence is the same as in P. incanus which 

 seems to be a very variable species. 



Philadelphus incanus var. Baileyi Rehder in Bailey, Gent. Herb. i. 



27 (1920). 



Honan: Chi kung shan, alt. 500-800 m., L. H. Bailey, June 13, 

 1917. — See also Bailey, 1. c. 



Philadelphus sericanthus Koehne in Gartenfl. xlv. 561 (1896); inBot. 

 Jahrb. xxix. 371 (1900). 



Shensi: In kia p'u, G. Giraldi, no. 1655 (ex Koehne, 1. c). 



Kansu: Choni district, alt. 3000 m., W. Purdom, no. 1021, 1910. 



Distribution: also Ilupeh, Szechuan. 



Purdom's specimen from Kansu differs in the flaky bark and in the 

 glaucescent underside of the leaves and may possibly represent a distinct 

 species related to P. laxiflorus from which it differs, however, markedly 

 in the pubescent calyx, the only slightly pubescent upper surface of the 



leaves and the slightly divided style. 



