C. Fruits dark purple. D. Leaves ovate, acute, finely serrated; shoots becoming glabrous; stones pointed at both ends =20. P. maritima.= D.D. Leaves oval-orbicular, crenate-serrate; shoots usually pubescent; stone pointed only at the base =21. P. gravesii.= C.C. Fruits red or orange, sometimes yellow but never deep purple. D. Fruits large, 1 inch in diameter; leaves oblong-ovate, long-pointed, margin serrate with incurved sometimes glandular teeth, upper surface glabrous, lower surface pilose; petiole with 1 or 2 glands; stone oval, flattened =22. P. orthosepela.= D.D. Fruits small, ½ inch in diameter. E. Leaves small, ovate-lanceolate or oval, margins finely and evenly serrate, upper surface glabrous, lower surface soft pubescent; petioles short and stout; fruits variable in color, mostly red; stone turgid, pointed at both ends =23. P. gracilis.= E.E. Leaves oblong-ovate, margins coarsely or doubly serrate, glabrous above and sparingly pubescent below; petiole glandular; fruits cherry-red =24. P. rivularis.= =1.= =PRUNUS DOMESTICA= Linnaeus [Illustration: _PRUNUS DOMESTICA_] =1.= Linnaeus _Sp. Pl._ 475. 1753. =2.= Duhamel _Traite des Arb._ =2=:93, 95, 96. 1768. =3.= Seringe _DC. Prodr._ =2=:533. 1825. =4.= Hooker _Brit. Fl._ 220. 1830. =5.= London _Arb. Fr. Brit._ 1844. =6.= De Candolle _Or. Cult. Pl._ 212. 1885. =7.= Schwarz _Forst. Bot._ 338. 1892. =8.= Koch, W. _Syn. Deut. und Schw. Fl._ =1=:727. 1892. =9.= Dippel _Handb. Laubh._ =3=:636. 1893. =10.= Lucas _Handb. Obst._ 429. 1893. =11.= Waugh _Bot. Gaz._ =26=:417-27. 1898. =12.= Bailey _Cyc. Am. Hort._ 1448. 1901. =13.= Waugh _Plum Cult._ 14. 1901. =14.= Schneider _Handb. Laubh._ =1=:630. 1906. _P. communis domestica._ =15.= Hudson _Fl. Anglic._ 212. 1778. =16.= Bentham _Handb. Brit. Fl._ =1=:236. 1865. _P. œconomica_ (in part) and _P. italica_ (in part). =17.= Borkhausen _Handb. Forstb._ =2=:1401, 1409. 1803. =18.= Koch, K. _Dend._ =1=:94, 96. 1869. =19.= Koehne _Deut. Dend._ 316. 1893. Tree reaching a height of 30 or 40 feet, vigorous, open-headed, round-topped; trunk attaining a foot or more in diameter; bark thick, ashy-gray with a tinge of red, nearly smooth or roughened with transverse lines; branches upright or spreading, straight, stout and rigid, usually spineless; branchlets usually pubescent, light red the first year, becoming much darker or drab; lenticels small, raised, conspicuous, orange.