68 WILSON EXPEDITION TO CHINA 



lenti v. glabri; pedicelli 2-5 mm., raro infirm ad 8 mm. longi; cupula 

 3 mm. longa, 4-4.5 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. cordata, pleraque late inverse oblonga intermixtis paucissimis obo- 

 vatis, omnia subtus baud 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, W&i-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. 



