ROSACEAE. — PRUNUS 237 



Folia subtus ochraceo-hirtello-tomentosa, venarum reticulo subtus valido. 



Stylus glaber P. diclyoneura. 



Folia subtus glabra v. nonnisi juxta costam hirtella v. barbulata. 



Folia supra medium latiora. Stylus glaber P. humilis. 



Folia medio v. infra medium latiora. Stylus glaber v. basi pilosus. 



P. glandulosa. 



Folia ovata, ovato-rotundata v. raro ovato-lanceolata, nunquam supra medium 



latiora, acuminata v. caudata, dentibus majusculis v. magnis duplicato- 



serrata v. -crenata. 



Folia ad summum 3 cm. longa. Stylus usque ad medium hirtus. P. pogonostyla. 



Folia 3.5-8 cm. longa. 



Rami glabri v. pulverulenti. Folia subtus glabra v. in costa nervisque breviter 



hirtella. Stylus glaber v. basi pilosus P.japonica. 



Rami densissime hirsuti. Folia subtus hirsuta. (Stylus ignotus.) 



P. carcharias. 

 Sect. 2. AMYGDALOCERASUS, p. 268. 



Ovarium inde a basi v. saltern a tertia parte villoso-tomentosum. Pedicelli 0.5-4.5, 



rarissime ad 6.5 mm. longi. 



Rami usque in secundum tertiumque annum tomentosi, demum cortice hinc 



inde rimoso baud v. sero soluto baud v. raro castanei .... P. iomentosa. 



Rami ab initio glaberrimi v. hinc inde pulverulenti, annotini cortice tenui argen- 



teo soluto demum intense castanei P. Batalinii. 



Ovarium summo apice tantum pilosum; pedicelU 6-8 mm. longi. Ramuli superne 

 pubescentes. Flores coaetanei foliis simul ad 3 cm. longis; cupula 4.5 mm. longa, 

 ebasirotundatacrassecupuliformis; 8epala2mm. longa .... P. cinerascena. 



ENUMERATIO SPECIERUM OMNIUM SUBGEN. CERASI ADJECTIS 

 SPECIERUM NOVARUM DIAGNOSIBUS VEL DESCRIPTIONIBUS. 



GrexL TYPOCERASUS Koehne, n. divis. 



Sect. 1. CREMASTOSEPALUM ^ Koehne, n. sect. 



Subsect. 1. MAHALEB Koehne. 



Cerasus sect. Mahaleb Roemer, Fam. Nat. Syn. III. 79 emend. (1847). 

 Prunus subgen. Cerasus sect. Mahaleb Koehne, Deutsche Dendr. 305 (1893). 



Ser. 1. EuMAHALEB Koehne, n. ser. 



1. Prunus Mahaleb Linnaeus. Europe, Western Asia. 



Ser. 2. Paramahaleb Koehne, n. ser. 



2. Prunus mollis Walpers. Western North America. 



3. Prunus emarginata Walpers. Western North America. 

 Cerasus calif ornica Greene an hue ducenda? 



4. Prunus pennsylvanica Linnaeus. Eastern North America. 



Subsect. 2. EUCERASUS Koehne. 

 Prunus sect. Eucerasus Koehne, Deutsche Dendr. 306 (1893). 



5. Prunus fruticosa Pallas. Europa to Siberia. 



^ From KpffMavvvfii, to hang. 



