POMACEAE. 517 



1. Aronia arbutifolia(L.) Medic. RED CHOKE-BERRY. (I. F. f. 1983.) Leaves 

 oval, oblong or obovate, obtuse or short-pointed at the apex, narrowed or some- 

 what cuneate at the base, 2-8 cm. long, glabrous above, densely tomentose be- 

 neath; flowers white or purplish-tinged, 8-12 mm. broad; calyx and pedicels 

 tomentose; pome 4-6 mm. in diameter, short-pyriform, and bright red when ma- 

 ture, long-persistent. In swamps and wet woods, N. Y. to Fla. March-May. 



2. Aronia atropurpurea Britton, ;/. sp. PURPLE-FRUITED CHOKEBERRY. 

 A shrub, sometimes 4 m. high, usually taller than the other species. Calyx, pedi- 

 cels and lower leaf-surfaces tomentose; flowers similar to those of the preceding ; 

 fruit oval to globose, purple-black, 6-10 mm. high. In wet soil, N. S. to Fla. 

 April-June. Type from Arlington, Staten Island. 



3. Aronia nigra (Willd.) Britton. BLACK CHOKEBERRY. (I. F. f. 1984.) 

 Leaves obovate or oval, short-petioled, crenulate, dark green above, paler beneath, 

 glabrous or nearly so on both surfaces ; calyx and pedicels nearly glabrous; fruit 

 globose or oval, nearly black, 6-8 mm. in diameter, early deciduous. In swamps 

 or low woods, or sometimes in drier soil, N. S. to Ont., Fla. and Mich. March- 

 June. 



5. AMELANCHIER Medic. 



Shrubs or trees, with simple petioled leaves, unarmed branches, and racemose 

 or rarely solitary white flowers. Calyx-tube campanulate, adnate to the ovary, 

 5-lobed, the lobes narrow, reflexed, persistent. Petals 5. Stamens oo , inserted on 

 the throat of the calyx; filaments subulate; styles 2-5, connate, pubescent at the 

 base. Ovary inferior, its cavities becoming twice as many as the styles ; ovule I 

 in each cavity, erect. Pome small, berry-like, 4-io-celled. Testa of the seed 

 cartilaginous. [The Savoy name of the Medlar.] About 12 species, natives of the 

 north temperate zone. Besides the following, some 3 others occur in western 

 N. Am. and I in Mex. 



Flowers several or numerous in the racemes; pome globose. 



Glabrous or pubescent trees and shrubs; leaves usually serrate nearly all around. 



Leaves acute or acuminate at the apex ; top of the ovary glabrous or nearly so. 

 Leaves ovate, oval or ovate-lanceolate, glabrous when mature; base cordate 



or rounded. i. A. Canadensis. 



Leaves oblong, oval, ovate or obovate, rarely subcordate at base, densely 

 white-woolly beneath, at least when young. 2. A. Botryapium. 



Leaves rounded, obtuse or subacute at the apex; top of the ovary woolly. 

 Low shrub of rocky places, 3-6 dm. high ; petals 4-8 mm. long. 



3. A. spicata. 



Tree or small shrub ; petals 10-16 mm. long. 4. A. rotundifolia. 



Glabrous western shrub; leaves dentate above the middle only. 5. A. alnifolia. 

 Flowers only 1-4 in the clusters; pome oblong or obovoid. 6. A. oligocarpa. 



1. Amelanchier Canadensis (L.) Medic. JUNE-BERRY. SERVICE-BERRY. 

 MAY-CHERRY. (I. F. f. 1985.) A tree, sometimes reaching the height of 20 m. 

 Leaves ovate or oval, sharply and finely serrate, soon entirely glabrous, 210 cm. 

 long; racemes spreading or drooping ; pedicels long, slender; bracts silky, pur- 

 plish, deciduous ; petals linear, linear-spatulate, or linear-oblong, 1-2 cm. long, 

 3-4 times the length of the nearly or quite glabrous calyx ; pome red or purple, 

 sweet, about 6 mm. high. In dry woodlands, Newf. to Ont., Fla. and La. March- 

 May. Fruit ripe June-July. 



2. Amelanchier Botryapium (L. f.) DC. SHAD-BUSH. SWAMP SUGAR- 

 PEAR. (I. F. f. 1986.) A shrub or small tree, sometimes 10 m. high, the foliage 

 and inflorescence densely white-woolly when young, often nearly or quite glabrous 

 when old. Leaves acute at the apex, finely and sharply serrate nearly all around; 

 racemes short, rather dense; pedicels short, seldom over 2.5 cm. long; petals spatu- 

 late or linear-spatulate, 6-14 mm. long, 2-3 times as long as the calyx-lobes; calyx 

 usually densely white-woolly; pome 6-8 mm. in diameter. In swamps and moist 

 soil, N. B. to Manitoba, Fla. and La. April-May. 



3. Amelanchier spicata (Lam.) Dec. Low JUNE-BERRY. (I. F. f. 1987.) 

 Stems 3-6 dm. high from a long root creeping among rocks. Leaves elliptic or 

 oval, 2-4 cm. long, rounded at both ends, or sometimes subacute at the apex, some- 

 times subcordate at the base, serrulate or dentate-ferrate, or sometimes entire be- 

 low the middle, dark green and quite glabrous when mature, woolly when young ; 



