458 ROSACEAE (ROSE FAMILY) 



2. MALUS (Hill) S. F. Gray. (APPLE.) Leaves simple; orifice of concave 

 receptacle open; flesh of large subglobular fruit copious, free from sclerotic 

 cells. MALUS [Tourn.] Hill. 



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

 -*- Calyx-lobes deciduous in fruit. 



2. P. BACCATA L. (SIBERIAN CRAB.) Small tree; leaves ovate-oblong, ser- 

 rate but not lobed, acuminate, at length 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. PRUNIFOLIA 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 shallowly 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 111., "Kan.," and southw. 



-*- t- Calyx-lobes persistent in fruit. 



4. P. coronaria L. (AMERICAN CRAB.) Tree, somewhat armed, 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. 

 (Malus Mill.) Thickets and open woods, N. J. to Ont., Kan., and southw. 



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

 clothed with a persistent white or gray tomentum. 



6. P. ioSnsis (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. lony in 

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

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



x P. Souldrdi Bailey. A hybrid between P. ioensis and P. Malus, 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. 



6. 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. (CHOKEBERRY.) Leaves simple, the midrib 

 </l<nnlnl(ir (dour/ the, upper sirfc ; cymes compound; styles united at base, 

 fruit small, berry-like. A RON i A Medic. 



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

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

 or glabrate above, paler and permanently ctniesrait-tiiincntnse below; pedirrfs, 

 ruh/.f. and young fruit cumwiit-t<>mrnf<w ; petals white or reddish ; ripe fruit 

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

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

 to pass without sharp distinction into 



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



