458 ROSACEAE (rose FAMILY^ 



I 

 §2. MALUS (Hill) S. F. Gray. (Apple.) Leaves simple; onfice oj concave 

 receptacle open; flesh of large suhglohular J ruit copious, free from sclerotic 

 cells. Malls [Tourn.] Hill. 



* Leaves and usually the outer surface of the calyx-lobes glahrate. 

 -*- Calyx-lobes deciduous in fruit. 



2. P. baccXta L. (Siberian Crab.) Small tree ; leaves ovate-oblong, ser- 

 rate but not lohed, acuminate, at leiit,ah subcoriaceous ; petals narrowly oblong, 

 with cuneate-attenuate base ; pedicels slender, fascicled ; pome 2-3 cm. in diam- 

 eter, usually yellow with reddish cheek. (Mains Borkh.) — Common in cultiva- 

 tion, and locally established as an escape in borders of woods, etc.. Me., Ct., and 

 doubtless elsewhere. (Introd. from Eurasia.) 



X P. prl'nif6lia Willd. A highly variable group of hybrids between P. 

 baccata and P. Mains, combining in differing degrees the characteristics of the 

 two parents. — Cultivated as Crab Apples, and not rarely spontaneous by 

 roadsides, in open woods, etc. (Introd. from Eu.) 



3. P. angustifblia Ait. Small tree ; branchlets often hardened and spine- 

 like ; leaves elliptic-oblong to lance-oblong, serrate-dentate to nearly entire, 

 those of the sterile shoots often sliallowly and somewhat pinnately lobed, the 

 midnerve commonly glandular above ; flowers in 3-7-flowered umbel-like cor- 

 ymbs ; petals oblong to obovate, contracted at the base to a cuneate claw ; 

 pome greenish-yellow, hard and sour, 2-2.6 cm. in diameter, depressed-globose. 

 (Mains Michx.) —River thickets, etc., N. J. to III., '• Kan.," and southw. 



-»- -i- Calyx-lobes persistent in fruit. 



4. P. coronaria L. (American- Crab.) Tree, somewhat amied, 6-10 m. 

 high ; leaves ovate or elliptic, usually rounded or even cordate at the base ; those 

 of the sterile shoots somewhat triangular-ovate and lobed, sharply serrate ; 

 petals broadly obovate, white or nearly so; fruit much as in the preceding. 

 (Mains Mill.) — Thickets and open woods, N. J. to (Jut., Kan., and southw. 



* * Leaves at least on the lower surface and outer surface of the calyx-lobes 

 clothed vjith a persistent white or gray tomentum. 



5. P. ioensis (Wood) Bailey. Similar in habit to the two preceding; 

 leaves chiefly oblong or ovate-oblong, glabrate, dull green, and somewhat rugose 

 above, very pale and densely tomentose beneath, doubly serrate or pinnately 

 several-lobed, usually narrowed at the base; petioles woolly; flowers mostly 

 2-3 in a corymb ; the pedicels slender, tomentose, becoming 2.5-3.5 cm. long in 

 fruit; calyx-lobes persistent. (Pyrus coronaria, vax. Wood; Mains Britton.) — 

 111. and Wise, to Minn., Kan., and okla. 



X P. Soulardi Bailey. A hybrid between P. ioensis and P. Mains, and 

 of intermediate character, is said to occur in a wild state from Minn, to Tex. 

 It may be distinguished from P. ioensis by its shorter thicker pedicels, usually 

 about 2 cm. long, and somewhat larger fruit. 



0. P. Malus L. (Apple.) Leaves ovate-oblong, rounded or cordate at the 

 base, sub-equally serrate ; pedicels stout, woolly, 2-2.8 cm. long ; fruit 4 cm. or 

 more in diameter. (Malus Britton.) — The commonest fruit tree of cultivation, 

 often escaping to woods. (Introd. from Eu.) 



§3. ADEN6RHACHIS DC (Chokeberrt.) Leaves simple, the midrib 

 glandular along the upper side; cymes compound ; styles united at base, 

 fruit small, berry-like. Akonia Medic. 



7. P. arbutif51ia (L.) L. f. Shrub, 1-2.6 ra. high ; leaves oblong-oblanceo- 

 late, mostly acute or acuminate, finely glandular-serrate, green and glabrous 

 or glabrate above, paler and permanently canescent-tomentose below ; pedicels, 

 calyx, and young fruit canescent-tomentose ; petals white or reddish ; ripe fruit 

 red, about 7 mm. in diameter; cymes numerously (mostly 9-18-) fruited. 

 Aronia Ell.) —Swamps and low woods, N. Y. to 0., Ark., and Fla. —Appearing 

 to pass without sharp distinction into 



Var. atropurpurea (Britton) Robinson. Cymes less numerously (mostly 



