CERCIDIPHYLLACEAE. 



Determined by Alfred Rehder and E. H. Wilson. 



CERCIDIPHYLLUM Sieb. & Zucc. 



Cercidiphyllum japonicum Siebold & Zuccarini in Ahhand. Akad. 

 Miinch. IV. pt. III. 238 (Fl Jap. Fam. Nat. II. 114) (1846). — Miquel 

 in Ann. Mus. Lugd.-Bat. III. 140 (1867). — Maximowicz in Bull. 

 Acad. Sd. St. Petershourg, ser. 3, XVII. 142 (1872). — Sargent in 

 Garden & Forest, VI. 52, fig. 9 (1893); VII. 104, fig. 21-22 (1894). — 

 Shirasawa, Icon. Ess. For. Jap. I. t. 41 (1900). — Finet & Gagnepain 

 in Bull. Soc. Bot. France, LII. Mem. IV. 26 (1905); Contnb. Fl. As. 

 Or. II. 26 (1907). 



Cercidiphyllum japonicum, var. sinense Rehder & Wilson, n. var. 



A typo differt petiolis brevioribus circiter 2 cm. longis, foliis basi 

 saepius subcordatis v. fere truncatis subtus secus nervos basim versus 

 pihs patentibus instructis, capsulis 2-3 apice sensim attenuatis stylo 

 persistente plerumque fere recto coronatis 10-15 mm. longis. — 

 Arbor 20-40 m. altus, trunco 2-18 m. plerumque 3-6 m. circuitu, 

 solitari rarissime e basi in truncos 2-3 divergente. 



Western Szech'uan: Lungan Fu, Tu-ti-Iiang-shan, open country, 

 alt. 2300-2800 m., August and October 1910 (No. 4301, type); Wa- 

 shan, woodlands, alt. 1600-2600 m., September 1908 (No. 742^). 

 Western Hupeh: Fang Hsien, alt. 2000-2600 m., May and Octo- 

 ber 1907 (No. 742); same locality, June 16, 1910 (No. 742*'). 

 Shensi: southern slopes of the Tai-pei-shan, alt. 2300 m., 1910, 

 W. Purdom. 



We have seen no flowers of this variety, and in the herbarium material the 

 characters which distinguish it from the type are rather slight. In habit the 

 two trees are different. The Japanese tree has usually several trunks which, if occa- 

 sionally united at the base, diverge a few feet above the ground. Sometimes, 

 however, the trunk is single and free of branches for 16 m. above the ground. 

 The Chinese tree has usually but one trunk and lateral branches commence a 

 few feet above the ground; occasionally a few small stems are found growing 

 around the base of the tree. Very rarely are two or three trunks developed and 

 we never saw more than half a dozen such examples among the thousands of trees 

 we have seen. The Japanese tree affects the forest depths, the Chinese tree open 



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