ROSACE AE. — SIBIRAEA 455 



Spiraea Miyabei, var. pilosula Rehder, n. var. 



A typo recedit foliis basi cuncatis subtus ad costam venasque ad- 

 presse villosis, supra sparsius adpresse pilosis v. fere glabris, saepius 

 magis profundi inciso-serratis, calyce extus sparse piloso. 



Western Hupeli: Hsing-shan Hsicn, woodlands, etc., alt. 1000- 

 1600 m., June and October 1907 (No. 2756, type; bush, 1-2 m. high, 

 branches arching, flowers white); same locahty, June 1907 (No. 2757; 

 bush, 1.25-2 m. high; flowers white); without precise locality, ^4.. 

 i/enr?/ (No. 6333). Szech'uan: south Wushan, May 1901 (Veitch 

 Exped. No. 997, in part, as to the flowering specimen) ; without precise 

 locality, A. Henry (No. 5628). 



This variety differs from the type chiefly in the cuneate leaves pubescent below. 

 The forms with more deeply incised leaves, as No. 997 and Henry's 5628, have 

 some resemblance to S. Rosthornii Pritzel, but are easily distinguished from it by 

 the short and small winter-buds, the glabrous or glabrescent branchlets, and by 

 the less pubescent inflorescence. 



Here may be added the description of yet another variety based on material 

 collected during the Veitch expedition: 



Spiraea Miyabei, var. tenuifolia Rehder, n. var. 



A typo recedit foliis majoribus ad 7 cm. longis et 3.5 cm. latis basi cuneatis, 

 subtus glaucescentibus, petiolis gracilioribus ad 1 cm. longis, ramulis perfecte 

 teretibus. 



Western Szech'uan: Mt. Omei, June 1904 (Veitch Exped. No. 4840). 



SIBIRAEA Maxim. 

 Determined by Alfred Rehder. 

 Sibiraea laevigata Maximowicz in Act. Hort. Petrop. VI. 215 (1879). 



Spiraea laevigata Linnaeus, Mant. II. 244 (October 1771). — Kerner, Darstcll. 



Vorzuegl. Ausl. Baeum. Gestr. 4, t. 29 (1796). — Guimpel, Otto & Haj-ne, 



Abbild. Holz. 113, t. 89 (1825). 

 Spiraea altaiensis Laxmann, in Acad. Sci. Petrop. Conim. Nov. XV. 554, t. 29 



(1771). 

 Sibiraea altaiensis Schneider, III. Handb. Laubholzk. I. 486, fig. 297 e-f, 



298 i-p (1905). 



Sibiraea laevigata, var. angustata Rehder, n. var. 



A typo recedit fohis anguste lanceolatis 3-10 cm. longis et 7-15 mm. 

 latis acutiuscuUs mucronatis, nervis minus distinctis vix curvatis et 

 praecipue inflorescentia et interdum tubo calycis breviter villosis. 



Western Szech'uan: Pan-lan-shan, west of Kuan Hsien uplands, 

 alt. 4000-4500 m., June 24, 1908 (No. 2773, type; shrub, 1-1.30 m. 



