ROSACEAE. — PRUNUS 59 
pistillum c. 8-9 mm. longum, glabrum, semel vidi pistillum obsoletum 
stylo subnullo stigmate obsoleto. 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. hypozantha). 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 specierum omnium. 
Flores racemosi racemis 1.5-5 cm. longis densifloris, pedicellis 1-5 mm. longis. 
Folia subtus haud villosa. 
Folia subtus albicantia glaberrima .... . "ido gigs 1. M. hypoleuca. 
Folia subtus lutescentia in costa nervisque strigulosa. . .2. M. hypozantha. 
Folia subtus villosa. 
Folia inciso-duplicato-serrata dentibus angustissimis. '. . 3. M. Wilsonii. 
Folia eiliato-dentcülala- — 1: - .-. 4. 9. nd 4. M. himalaica^ 
Flores subcorymbosi pedicellis bipollicaribus. . . . - - +--+ 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). 
Y Maddenis himalaica Hooker f. & Thome in Hooter — Bot. and Kew 
Gard. Misc. VI. 381, t. 12 (1854) (descriptio et t 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. 
