ROSACEAE. — PRUNUS 59 



pistillum c. 8-9 mm. longum, glabrum, semel vidi pistillum obsoletum 

 stylo subnullo stigmate obsolete. Drupa ad 9 mm. longa 6 mm. diam., 

 ovata, nigra. Putamen ut in praecedente. 



Western Szech'uan: Mupin, alt. 1500-2500 m., May and June 

 1908 (No. 2851); southeast of Tachien-lu, alt. 1800-2700 m., May 

 1908 (No. 909, mixed with M. hypoxaniha). Western Hupeh; 

 Chang-yang Hsien, alt. 1200-1800 m., April and July 1907 (No. 63). 



Of the genus Maddenia Hooker f. & Thomson (in Hooker Jour. Bot. and Kew 

 Gard. Misc. VI. 381 [1854]), only two species, both from the Himalayas, are enum- 

 erated in the Index Kewensis and its supplements. Wilson found in China three 

 new species which have the deciduous and closely serrate leaves of Maddenia, 

 while the closely related Pygeum has persistent entire leaves. These important 

 distinguishing characters are not mentioned by Focke (in Engler and Prantl, Nat. 

 Pflanzenfam. III. 1, 51), who also states there that the pistillate flowers have two 

 carpels developing into two drupes. According to Hooker f. & Thomson, how- 

 ever, their structure is quite different. The flowers with two pistils are staminate, 

 and their pistils do not bear styles, but a sessile stigma, and contain only abortive 

 ovules. The twin-fruits which these flowers produce attain only half the size of the 

 normal fruits and form no seeds. The normal fruits originate from perfect flowers 

 with a pistil bearing a long style and contain one seed, as only one of the two ovules 

 develops. In the Chinese species I have never found two pistils in one flower. 

 Flowers without exserted styles can be found only in very small numbers, and as 

 far as I have examined these flowers, they contain only one pistil with a minute 

 style and a rudimentary stigma. The presence of two pistils must therefore be 

 considered as of less importance than the character of the foliage. 



A key to all the species is appended here : 



Clavis specienim omnium. 



Floras racemosi racemis 1.5-5 cm. longis densifloris, pedicellis 1-5 mm. longis. 

 Folia subtus haud villosa. 



FoUa subtus albican tia glaberrima ' 1. M. hypoleuca. 



Folia subtus lutescentia in costa nervisque strigulosa. . . 2. M. hypoxantha. 

 Folia subtus villosa. 



Folia inciso-duplicato-serrata dentibus angustissimis. ' . . Z. M. Wilsonii. 



Folia ciliato-denticulata 4. ilf . himalaica.^ 



Flores subcorymbosi pedicellis bipollicaribua 5. M. pedicellata.* 



PRUNUS L. 



Subgen. PADUS. 



Determined by E. Koehne. 



Prunus Buergeriana Miquel in Ann. Mus. Lugd.-Bat. II. 92 (1865) ; 

 Prol. Fl. Jap. 24 (1866). 



* Maddenia himalaica Hooker f. & Thomson in Hooker Jour. Bot. and Kew 

 Gard. Misc. VI. 381, t. 12 (1854) (descriptio et tabula optimae). 



Himalayas: Sikkim, alt. 2400-3000 m.. May and August, J. D. Hooker. 

 » Maddenia pedicellata Hooker f., Fl. Brit. Ind. II. 318 (1878). 

 India: Mishmi Hills, Griffith. 



