ROSACEAE. 



Subfam. POMOIDEAE. 

 Determined by Alfred Rehder. 



PYRUS L. 



Pynis serotina Rehder in Proc. Am. Acad. L. 231 (1915). 



Westerir Hupeh: Hsing-shan Hsien, woodlands, alt. 1300-2000 

 m., May and December 1907 (No. 479% type); same locality, May 

 and October 1907 (No. 2977); Patung Hsien, thickets, alt. 1000-1600 

 m.. May 1907 (No. 556^) ; north and south of Ichang, thickets, alt. 

 600-1300 m., April 1907 (No. 479^); same locality, October 1907 (No. 

 415); Changlo Hsien, thickets. May 1907 (No. 556'=); without precise 

 locality, A. Henry (No. 5299). Eastern Szech'uan: without pre- 

 cise locality, A. Henry (No. 5875). Western Szech'uan :Tachien-lu, 

 alt. 2000-2600 m., October 1908 (No. 1293). 



This is one of the Chinese Pears formerly referred to P. sinensis Lindley (not 

 Poiret). It differs from that species for which 1 have proposed the name P. Lindleyi 

 (in Proc. Amer. Acad. L. 230) chiefly on account of its brown fruit with deciduous 

 calyx and of its sharply and setosely serrate, not denticulate or dentate leaves. In 

 the form which I consider the type of P. serotina the leaves are generally oblong- 

 ovate, rounded at the base, and the brown fruit is subglobose and measures about 

 3 cm. in diameter. 



Wilson's No. 2977, of which the fruit is not known, differs from the type in its 

 broader ovate or broadly ovate leaves with more appressed teeth and may repre- 

 sent a distinct variety or even another species. Henry's No. 5875 has the fruit 

 pjTiform and may belong to P. serotina, var. Stapfiana Rehder. Henry's No. 

 5299 is in flower only and agrees with this species in its glabrous styles; both of 

 Henry's specimens may be from cultivated plants. 



Pyrus serotina is common in Szech'uan and Hupeh and is cultivated in sev- 

 eral improved forms as it is in Japan. The plant known in horticultural htera- 

 ture as P. sinensis belongs mostly to this species. Also P. sinensis Diels (in Bot. 

 Jahrb. XXIX. 387) is probably referable to P. serotina, if it does not belong to 

 the following species. 



A picture of this tree will be found under No. 0148 of the collection of Wilson's 

 photographs. 



Pyrus semilata Rehder in Proc. Am. Acad. L. 234 (1915). 



Western Hupeh: Hsing-shan Hsien, thickets, alt. 1300-1600 m., 

 May and December 1907 (No. 779, type) ; north and south of Ichang, 

 alt. 600-1300 m., October 1907 (No. 479). 



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