[3] The leaves are conduplicate in vernation in a few species of American plums; these species are intermediate between plums and cherries. [4] The species are given as classified by Koehne, _Plantae Wilsonianae_ Pt. =2=:237-271. 1912. The liberty has been taken of changing the form of Koehne's citations to conform to that used at this Station. For the sake of brevity some of the citations of the original author have been omitted. Space does not permit the publication of Koehne's system of classification. This may be found in _Plantae Wilsonianae_ Pt. =2=:226-237. 1912. Conservative botanists will hardly accept all of Koehne's species, in describing which the author tells us he labored under the difficulty of paucity of material and that as more material comes to hand there must, therefore, be revisions. These species are provisionally accepted in _The Cherries of New York_ under the belief that botany and horticulture are best served by giving names freely so that all forms to which reference may need to be made may thus be better identified. The botanical student of Cerasus is referred to Schneider's comprehensive discussion of Prunus in his _Handbuch der Laubholzkunde_ =1=:589-637. 1906 and =2=:973-993; also Koehne's monographs of Cerasus, Sargent, C. S., _Plantae Wilsonianae_ Pt. =2=:197-271. 1912. Profitable though it might be, space does not permit in _The Cherries of New York_ a botanical discussion of other than the species cultivated for their fruits. [5] Koehne has presented the results of a careful study of the distribution of cherries in _Mitt. Deutsch. Dendr. Ges._ 168-183. 1912. [6] Greene (_Proc. Biol. Soc. Wash._ =18=:55-60. 1905), preferring Cerasus to Prunus as a generic name for racemose cherries, gives the following new species: _Cerasus californica_ (_Fl. Francis_. 50. 1891) from the hills of middle western California; _Cerasus crenulata_ from the Mongolian Mountains, New Mexico; _Cerasus arida_ inhabiting the borders of the desert at the eastern base of the San Bernardino Mountain, California; _Cerasus prunifolia_ found in the mountains of Fresno County, California; _Cerasus rhamnoides_ collected at Mud Springs, Amador County, California; _Cerasus kelloggiana_ from the middle Sierra Nevada Mountains in California; _Cerasus padifolia_ collected in the foothills near Carson City, Nevada; _Cerasus obliqua_ described from a single specimen from Oroville, California; _Cerasus parviflora_ known only from Mt. Shasta, California; _Cerasus obtusa_ from the arid interior of southeastern Oregon; and _Cerasus trichopetala_ found at Columbia Falls, Montana. The type specimens of these eleven species are in the National Herbarium at Washington. PRUNUS CERASUS Linnaeus. I. Linnaeus _Spec. Pl._ 474. 1753.