ROSACE AE . — PRUNUS 227 



Glandulae foliorum bractearumque dentibus insidentea minutiasimae, 

 interdum bractearum glandulae infimae tantum majores. (Distributio 



subsectionis.) Ser. 1. Aphanadenium. 



Glandulae foliorum atque imprimis bractearum crassae v. crassiasimae, 

 breviter conicae v. depresso-disciformes. (China.) 



Ser. 2. Macradenium. 



Umbellae (l-)2— i-florae, flore infimo saepe paullo inferius inserto, breviter 



pedunculatae V. rare sessiles. (China.) Subsect. 4. PHYLLOCERASUS. 



Bracteae membranaceae minimae, sub anthesi vel paullo posterius deciduae. 



Flores coaetanei v. praecoces. (China.) 



Subsect. 5. PSEUDOMAHALEB. 



Petala inciso-biloba v. manifeste emarginata. Umbellae sessiles v. breviter v. 



longiuscule pedunculatae flore infimo subremoto, floribus (l-)2-6. (China.) 



Subsect. 6. LOBOPETALUM. 



Sepala cupula nunc brevi lata nunc manifeste tubulosa breviora. Involucra 



sub anthesi nunc decidua nunc persistentia; bracteae minimae v. inclusae. 



Flores praecoces Ser. 1. Heterocalyx. 



Sepala cupula brevi lataque duplo longiora lanceolata (in speciebus nonnullis 

 habitu hue pertinentibus vero ignota). Involucra (quoad nota) sub anthesi 

 persistentia; bracteae herbaceae majusculae v. interdum absconditae. 

 Flores coaetanei v. praecoces Ser. 2. Cyclaminium. 



Sect. 2. PSEUDOCERASUS.i 



FoUa subtus glanduUs punctata. (Terra Amurensis.) 



Subsect. 7. HYPADENIUM. 

 Folia subtus eglandulosa. 



Involucra magna, circiter 1 cm. longa v. majora. Folia haud insigniter lobulato- 

 v. incisonduplicato-serrata. 

 Pedicelli fructiferi haud v. apice tantum sensim incrassati. 



Cupula e basi acuta turbinato-tubulosa v. anguste tubulosa, sepala cupula 

 sublongiora v. paullo, raro dimidio breviora. Flores coaetanei v. prae- 

 coces (in P. parvifolia^ vero dicunter autumnales). Fohorum dentes saepe 

 acuminatissimae v. in setulam exciirrentes. Drupae nigrae; putamen 

 (quoad notum) laeve v. obsolete sulcatum. (China, Korea, Japonia, 



Saghalin.) Subsect. 8. SARGENTIELLA. 



Cupula e basi obtusa campanulata v. cylindracea. Drupae quoad notae 

 rubrae. 

 Flores praecoces. Putamen (quoad notum) laeve v. obsolete sulcatum, 

 (in P. pauciflora tantum reticulato-costatum). Cupula 5-9 mm. 

 longa, sepala cupula dimidio circiter v. paullo breviora. Foliorum 

 dentes majusculae, acutae v. acuminatae, rarius setaceo-acuminatae. 

 Umbellae sessiles v. interdum pedunculo ad 10 mm. longo insidentea. 



(China, Japonia.) Subsect. 9. CONRADINIA. 



Flores coaetanei. Putamen insigniter rugosum, obtusissimum. Foli- 

 orum dentes parvae v. minimae. (Tibet, Yunnan.) 



Subsect. 10. SERRULA. 



' Here particularly the position of many species known only in fruiting speci- 

 mens will need confirmation by further investigation based on more complete 

 material. 



* The flowers of the specimens kindly sent me by Mr. Matsumura of Tokyo 

 were collected in spring according to a note on the labels. 



