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. sp. 
Arbor 6-metralis; ramuli annotini glabri, cinerei v. fuscescenti-cinerei. Stipulae 
angustissime lineares, glanduloso-fimbriatae; petioli glabri, glandulis 0 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 nervis 
breviter hirtella ceterum glabra v. remotissime pilifera, nervis utrinsecus circiter 
7-8. Involucrum circ. 1 em. longum latumque, sub anthesi persistens; pedun- 
culus subnullus; flores 2-3 umbellati, coaetanei; bracteae absconditae, subor- 
biculatae, 3-6 mm. longae, herbaceae, glanduloso-serratae; pedicelli 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. dentieulis 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. 
oe Hupeh: Pa-tung, April 28, 1900, E. H. Wilson (Veitch Exped. No. 
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. clarofolia 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 Rosthorn. 
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, Pl. Delavay. 195 (1889). — : 
Arbor excelsa; ramuli novelli hirti, annotini glabri, can v. cani, dens 
fusci; gemmae 2 mm. longae, ovato-rotundatae. Stipulae subulatae, dud sedi 
fimbriatae; petioli 8-12 mm. longi, crassi, dense hirti, glandulas paullo inira 
