ROSACEAE. — PRUNUS 237 
Folia subtus ochraceo-hirtello-tomentosa, venarum reticulo subtus valido. 
DRE glaber |i... 7. . QOL MIS M. P. dictyoneura. 
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 em. longa. Stylus usque ad medium hirtus. P. pogonostyla. 
Folia 3.5-8 em. 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. saltem a tertia parte villoso-tomentosum. Pedicelli 0.54.5, 
rarissime ad 6.5 mm. longi. pr 
Rami usque in secundum tertiumque annum tomentosi, demum cortice hine 
inde rimoso haud v. sero soluto haud v. raro eastanei . . . . P. tomentosa, 
Rami ab initio glaberrimi v. hinc inde pulverulenti, annotini cortice tenui argen- 
teo soluto demum intense castanei . . . . . . . . . . . P. Balalinii. 
Ovarium summo apice tantum pilosum; pedicelli 6-8 mm. longi. Ramuli superne 
pubescentes. Flores coaetanei foliis simul ad 3 cm. longis; cupula 4.5 mm. longa, 
e basirotundata crasse cupuliformis; sepala 2 mm. longa . . . . P. cinerascens, 
ENUMERATIO SPECIERUM OMNIUM SUBGEN. CERASI ADJECTIS 
SPECIERUM NOVARUM DIAGNOSIBUS VEL DESCRIPTIONIBUS. 
Grex I. 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. EuuAHALEB 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 californica Greene an huc 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. 
1 From xpepdvvvupt, to hang. 
