438 WILSON EXPEDITION TO CHINA 



SPIRAEA L. 



Determined by Alfred Rehder. 



Sect. 1. CHAMAEDRYON Ser. 



Spiraea pninifolia Siebold & Zuccarini, Fl. Jap. I. 131 (1835). — ■ 

 Maximowicz in Act. Hort. Petrop. VI. 184 (1879). — Palibin in Ad. 

 Hort. Petrop. XVII. 1, 73 (1899). — Diels in Bot. Jahrb. XXIX. 382 

 (1900). — Matsumura & Hayata in Jour. Coll. Sci. Tokyo, XXII. 

 119 and 12 (1906). 



Spiraea prunifolia, var. typica Schneider, III, Handb. Laubholzk. I. 450, fig. 



2S8 g-h (1905). 

 Spiraea prunifolia, f . simpliciflora Nakai in Jour. Coll. Sd. Tokyo XXVI. Art. 



1, 172 (1909). 



Chekiang: Ningpo, 1908, D. Macgregor. Korea: near Seoul and 

 Ping Yang, 1904, J. G. Jack (seeds 0. Also in Formosa. 



The specimen from Ningpo and from Formosa have the leaves pubescent Hke 

 the double-flowered form, while on the specimens from Korea the leaves are glab- 

 rous with the exception of the pubescence on the under side of the midrib of very 

 young leaves. The plants cultivated for nearly 20 years at the Arboretum have 

 slightly pubescent leaves. 



Spiraea prunifolia, var. plena Schneider, III. Handh. Laubholzk. I. 

 450 (1905). 



Spiraea crenata, v&T.foliis ovatis, floribus plenis Thunberg, Fl. Jap. 211 (1784). 

 Spiraea prunifolia Siebold & Zuccarini, Fl. Jap. I. 131, t. 70 (1835). — Forbes 



& Hemsley in Jow. Linn. Soc. XXIII. 226 (1887). — Diels in Bot. Jahrb. 



XXIX. 382 (1900). 



Western Hupeh: Hsing-shan Hsien, planted on graves, alt. 1000- 

 1600 m., May 11, 1907 (No. 2755); without precise locahty, May 1900 

 (Veitch Exped. No. 731), A. Henry (No. 5254). 



In central China S. prunifolia is found apparently only in its double-flowered 

 form as a cultivated plant. It is doubtful if Giraldi's No. 1136 referred by Diels 

 to this species belongs to it. 



Spiraea hypericlfolia Linnaeus, Spec. I. 489 (1753). — Maximowicz in 

 Act. Hort. Petrop. VI. 177 (1879). — Zabel, Strauch. Spir. 18 (1893).— 

 Schneider, HI. Handb. Laubholzk. I. 452, fig. 288 i-p, 289 c-d (1905). 



1 Plants raised from these seeds are growing in the Arnold Arboretum. 



