ROSACEAE. — PRUNUS 239 



18. Prunus pilosiuscula (Schneider) Koehne. See p. 202. 



19. Prunus polytricha Koehne. See p. 204. 



20. Prunus Rehderiana Koehne. See p. 205. 



21. Prunus venusta Koehne, n. ap. 



Arbor 6-inotr:iUs; ramuli annotini glabri, cinerei v. fuscescenti-cinerei. Stipulae 

 angiistissimc hneares, ghmdulo.so-fimbriatae; pctioU glabri, glanduhs v. parvis; 

 lamina sub anthesi 1.25-2 cm. longa, argute duplicato-serrata, dentibus mucronatis 

 glandula minima terminatis, supra sparsim strigulosa, subtus in costa ac nervia 

 breviter liirtella ceterum glabra v. remotissime pihfera, nervis utrinseous circiter 

 7-8. Involucrum circ. 1 cm. longum latumque, sub anthesi persisten.s; pedun- 

 culus subnullus; flores 2-3 umbellati, coaetanei; bracteae absconditae, subor- 

 biculatae, 3-6 mm. longae, herbaceae, glanduloso-serratae; pedicelU 10-12 mm. 

 longi, glabri; cupula 5 mm. longa, turbinato-campanulata, paullo longior quam 

 lata, glabra; sepala reflexa, triangularia acutiuscula, 3-4 mm. longa, fimbriolis 

 V. dcnticulis glandulosis utrinsecus 1-3 munita, glabra; petala ovato-rotundata, 

 8 mm. longa, 6.5 mm. lata, integra, alba; stamina 23, petalis subaequilonga, ad 

 7 mm. longa; stylus fere 3 mm., stamina superans, usque ad medium villosus. 

 Drupa ignota. 



Western Hupeh: Pa-tung, April 28, 1900, E. H. Wilson (Veitch Exped. No. 

 446). 



This species is yet incompletely known, but it differs from those species of this 

 group, the flowers of which are known, in the scales which form at the base of the 

 umbel an involucre persisting during anthesis, in the more turbinate shape of the 

 cupula, and in the nearly sessile umbel. From P. polytricha Koehne it differs in its 

 glabrous pedicels, and from P. darofolia Schneider it differs apparently in the more 

 acute teeth of the leaves. Prunus litigiosa Schneider, in which the involucre also 

 persists, has much narrower petals. 



22. Prunus litigiosa Schneider in Fedde, Rep. Nov. Sp. I. 65 (1905). 

 Hupeh: A. Henry (No. 5295). 



From those species of this group whose flowers are known P. litigiosa is pro- 

 visorily well distinguished by the narrow acutish petals and the somewhat slenderer 

 calyx. To form a correct opinion of this plant, much more copious material and 

 particularly the fruits are needed. 



Prunus litigiosa, var. abbreviata Koehne. See p. 205. 



23. Prunus clarofolia Schneider in Fedde, Rep. Nov. Sp. I. 67 (1905). 

 Szech'uan: Nan-ch'uan, summer 1891, A. von Rosthom. 



The roundish form of the leaves and their pale color on both sides, as well as 

 the slight lustre of the lower surface and the elevated veins and veinlets on the 

 upper surface are very characteristic. Occasionally I have noticed the pale color 

 and the lustre on the lower surface of the mature leaves also in other species of 

 the group, but the prominent reticulation does not seem to occur in other species, 

 nor the comparatively short and broad, not very acute serratures. It is to be 

 hoped that the flowers will show, when they become known, that P. clarofolia 

 really belongs in the subsect. Phyllocerasus. 



Subsect. 5. PSEUDOMAHALEB Koehne, n. subsect. 



24. Prunus yunnanensis Franchet, PI. Delavay. 195 (1889). 



Arbor excelsa; ramuli novelli hirti, annotini glabri, cano-ochracei v. cani, demum 

 fusci; gemmae 2 mm. longae, ovato-rotundatae. Stipulae subulatae, glanduloso- 

 fimbriatae; petioli 8-12 mm. longi, crassi, dense hirti, glandulas paullo infra 



