ROSACEAE. — SORBUS 457 



white, occasionally tinged pink); Changlo Hsien, cliffs, alt. 1300 m., 



May 1907 (No. 397, in part; bush, 3.25 m., flowers white). 



This variety is larger in every part and more vigorous than the type ; the flowers 

 are open in the centre on account of the longer and narrower claws of the petals. 

 Here may be added a variety from Shensi: 



Exochorda racemosa, var. Giraldii Rehder, n. var. 



Exochorda Giraldii Hesse in Milteil. Deutsch. Dendr. Ges. XVII. 191, 219 

 (1908), XVIII. 295, fig. (1909); in Fedde Rej). Spec. Nov. VIII. 347 (1910). 



A typo recedit foliis omnibus integris, rarissime indistincte crenato-serratis 

 graciliter petiolatis petiolis ad 2.5 longis plerumque purpureis, ramulis pallide 

 brunneis v. purpureis, fructibus turbinatis 13 mm. longis. 



The slender red petioles give to this variety a very distinct appearance ; even at the 

 end of the branchlets where the petioles of the type and of var. Wilsonii are hardly 

 1 cm. long, they are in this variety about 2 cm. long. The leaves are of firmer 

 texture only very rarely slightly serrate and smaller than those of the preceding 

 variety which it resembles in flower and fruit. In the original description the 

 flowers were described as " rubro-maculata," but this is apparently an error, and 

 the petals are normally white. 



Shensi : "Lao-y-san," 1897, G. Giraldi; "Kin-qua-san," July 10, 1897, G. Giraldi; 

 Tai-pei-shan, 1910, W. Purdom (No. 1); Moutan-shan, north-west of Han-cheng 

 Hsien, 1910, W. Purdom (No. 361); "Hu-kia-scien," 1897, Hugh Scallan. 



SORBUS L. 



Subgen. AUCUPARIA. 

 Determined by E. Koehne. 



Sorbus expansa Koehne, n. sp. 



Arbor 8-metraHs; truncus 20 cm. diam; rami suppetentes crassi, 

 5-8 mm. diam., sordide cinerei; gemmae 1.5-1.8 cm. longae, apice 

 parce rufo-villosae. Stipulae herbaceae, magnae, 10-14 mm. latae, 

 dentatae, dentibus seta decidua terminatis, autumno deciduae; folia 

 cum petiolo 2.5-5 cm. longo 9.5-18.5 cm. longa, (6-)7-juga; rhachis ex- 

 alata, densissime tomentoso-albicans v. -subochracea, interstitiis circi- 

 ter 0.8-1.4 (-2) cm. longis; foliola infima 2 minora, cetera aequilonga 

 V. suprema tantum subdecrescentia, basi primo aspectu acuta 

 sed revera hinc anguste cordata (lobulo rhachin tegente), late 

 lanceolata v. lanceolato-elliptica, majora 3.5-6 cm. longa, 0.9-1.3 

 cm. lata, sensim angustata v. subacuminata acutissima mucronata, 

 tertia v. dimidia parte Integra, superne argute serrulata dentibus 

 angustissimis v. fere subulatis porrectis utrinsecus circiter 6-18, 

 supra in costa nervisque densius ceterum parcissime v. haud albido- 



