ROSACEAE. PRUNUS 71 



Western Hupeh: Hsing-shan Hsien, woods, alt. 1700 m., May 

 1907 (No. 62, as to flowering branches; the fruiting branches belong to 

 P. discadenia Koehne, a new species of the section Phyllomahaleb.). 



DISPOSITIO PRUNI SUBGEN. PADI ET CLAVIS 

 SPECIERUM CHINENSIUM. 



Calyx fructifer totus persistens; bracteae caducae; stylus brevis. 



Sect. I. CALYCOPADUS. 



* Pedunculi racemorum foliati (intermixtis interdum nonnullis nudis); folia 



decidua v. sempervirentia. (Species omnea Americanae.) 



Subsect. 1. CAPOLLINIA. 



** Pedunculi semper nudi; folia decidua Subsect. 2. CALYCINIA. 



t Ramuli racemorumque pedunculi basi baud involucrati. 

 Folia subtus glabra v. baud ubique pilosa. 



Venarum reticulum supra nunquam, subtus nonnisi post anthesin 

 prominulum. Folia supra medium latiora, incumbenti-serrulata. 



P. Buergeriana. 



Venarum reticulum jam durante anthesi utraque pagina manifesto pro- 

 minulum; folia subtus in nervorum axillis multis barbulata ceterum 

 glabra, majora latiora (6-11 cm.: 2.5-4.5 cm.) quam in P. stellipila, 



brevius serrata dentibus latioribus P. venosa. 



Folia subtus ubique, versus costam densius, pilis fasciculatis conspersa, 

 minora angustiora (4.5-10 cm. : 2-3.5 cm.) quam in P. venosa, longius 



serrata dentibus angustioribus P. stellipila. 



ft Ramuli ac pedunculi basi usque ad autumnum squamis involucrati,. 



involucre 7-20 mm. longa P. perulata. 



Calyx fructifer (ima basi excepta) deciduus Sect. 2. GYMNOPADUS. 



* Sempervirentes. Pedunculi nudi; bracteae caducae; stylus brevis. 



Subsect. 3. LAUROCERASUS. 

 Petioli eglandulosi. Folia plerumque ovato-oblonga, caudato-acuminata, 



6-9 cm. longa. Racemi glabri P. microbotrys. 



Petioli glandulosi. Folia oblonga, acuminata, 10-18 cm. longa. Racemi 



pubescentes P. macrophylla l 



** Folia decidua. 



f Pedunculi foliati (intermixtis interdum nonnullis nudis); bracteae ca- 

 ducae Subsect. 4. EUPADUS. 



t Pedicelli fructiferi insigniter incrassati pallide lenticellati. Stylus brevis. 

 (Folia in speciebus chinensibus subtus aequaliter pilosa.) 



Ser. 1. PACHYPODIUM. 

 Pagina inferior inter pilos nunquam rufos mox vel ab initio optime 



conspicua. 



Pili transversi paralleli breves adpressi submicantes. . P. Wilsonii. 



Pili mox subhirti perturbati (initio tantum tomentum sericeum 



candidum densissimum sistentes) P. sericea. 



1 Prunus macrophylla Siebold & Zuccarini in Abhand. Akad. Munch. IV. pt. ii. 

 122 (Fam. Nat. Fl. Jap. 14) (1843). 



Laurocerasus macrophylla C. K. Schneider, III. Handb. Laubholzk. I. 647, fig. 



355 1. (1906). 

 So far only reported from eastern China (prov. Kwangtung). 



