68 WILSON EXPEDITION TO CHINA 
lenti v. glabri; pedicelli 2-5 mm., raro infimi ad 8 mm. longi; cupula 
3 mm. longa, 44.5 mm. lata, intus infra medium villosa; sepala vix 
ultra 1 mm. longa, obtusa, breviter glanduloso-fimbriata, ceterum 
glabra v. tenerrime ciliata; petala 4-5 mm. longa, 4 mm. lata, subro- 
tundata v. obovato-rotundata, integra v. leviter eroso-denticulata; 
stamina 21-28, majora petalis triente v. paene dimidio breviora; 
pistillum 4-5 mm. longum, glabrum, stylus sepala parum superans. 
Fructus c. 5-8 mm. diam. ut videtur; putamen 4-6 mm. longum, 
4-5 mm. diam., obsoletissime rugosum, durum. 
Prunus pubigera, var. Potaninii Koehne, n. var. 
Petioli puberuli; folia innovationum pleraque basi subcordata 
v. eordata, pleraque late inverse oblonga intermixtis paucissimis obo- 
vatis, omnia subtus haud v. vix papillosa. Sepala ciliata; petala 
5 mm., stamina majora 3 mm. longa. Putamen 4-5 mm. longum, 
4-5 mm. diam. 
Tibet: G. N. Potanin. Western Szech'uan: southeast of Ta- 
chien-lu, woods, alt. 1800-2100 m., June and September 1908 (No. 
980). 
Prunus pubigera, var. Prattii Koehne, n. var. 
Petioli subglabri v. glabri; folia innovationum pleraque basi cu- 
neata v. rotundata, intermixtis vix ullis subcordatis v. obovatis, om- 
nia subtus epapillosa. Racemi puberuli v. glabri; flores ignoti. 
Putamen 4-6 mm. longum, 4-5 mm. diam. 
Western Szech'uan: Tachien-lu, alt. 2700-4100 m., A. E. Pratt 
(No. 94); Mupin, woodlands, alt. 1500-1800 m., June 1908 (No. 
2845, as to fruiting branches; the flowering branches belong to P. ob- 
tusata.). Western Hupeh: Fang Hsien, woods, alt. 1500-1800 m., 
August 1907 (No. 181, remarkable for its glabrous racemes); Hsing- 
shan Hsien, woods, alt. 1200-1500 m., September 1907 (No. 2837). 
Prunus pubigera, var. obovata Koehne, n. var. 
Petioli glabri; folia pleraque e basi vix unquam subcordata obo- 
vata, subtus haud v. vix papillosa. Racemi glabri v. puberuli; petala 
4-5 mm. longa; stamina majora vix ultra 3 mm. longa. Putamen 
5.5 mm. longum, 5 mm. diam. 
Western Szech’uan: Wa-ssu country, Wén-chuan Hsien, woods, 
alt. 1800-2400 m., June 7, 1908 (No. 1045). Western Hupeh: Fang 
Hsien, woods, alt. 1500-2100 m., August 1907 (No. 186, with glabrous 
racemes). 
This variety seems similar in its habit to P. virginiana Linnaeus. 
