rosacea, (rose family.) 125 



<j 1 MALUS, Tourn. — Leaves simple : cymes simple and umbel-like : fruit fleshy, 

 ghibular, sunk in at the attachment of the stalk. (Apple.) 



1. P. COi'Oiiaria, L. (American Crab-Apple.) Leaves ovate, often 

 rather heart-shaped, cut-serrate or lobed, soon glabrous ; styles woolly and united at 

 the base. — Glades, W. New York to Wisconsin and southward. May. — Tree 

 20° high, with few, but very large, rose-colored fragrant blossoms, and translu- 

 cent, fragrant, greenish fruit. 



2. P. angustifolia, Ait. (Narrow-leaved Crab-Apple.) Leaves 

 oblong or lanceolate, often acute at the base, mostly toothed, glabrous ; styles dis- 

 tinct. — Glades, from Pennsylvania southward. April. 



P. Malus, the Apple-tree, is often found in deserted fields and copses. 

 P. communis, the Pear-tree, represents the typical section of the genus. 



§2. ADENORACIIIS, DC. — Leaves simple, the midrib beset with glands along 

 the ujijier side: cymes compound: styles united at the base : fruit berry -like, small. 



3. P. arbulifolia, L. (Choke-berry.) Leaves oblong or obovate, 

 find y serrate ; fruit pear-shaped, or when ripe globular. — Var. 1. erythro- 

 CARPA has the cyme and leaves beneath woolly, and red or purple fruit. Var. 

 2. melanOCArpa is nearly smooth, with black fruit. — Damp thickets, common. 

 May, June. — Shrub 2°- 10° high. Flowers white, or tinged with purple. 



§3. S6RBUS, Tourn. — Leaves odd-pinnate: cymes compound: styles separate: 



fruit berry-like, small. 



4. P. Americana, DC. (American Mountain-Ash.) Leaflets 

 13-15, lanceolate, taper-pointed, sharply sorrato with pointed teeth, smooth j 

 cymes large and flat. — Swamps and mountain woods, N. England to Wiscon- 

 sin northward, and along the Alleghanies southward. June. — A slender shrub 

 or low tree, with white blossoms ; greatly prized in cultivation for its ornamen- 

 tal clusters of scarlet fruit (not larger than large peas) in autumn and winter. 



P. aocupXria, GaJrtn., the cultivated European Mountain-Ash or Row- 

 an-tree, is known by its paler, shorter, and blunt leaflets, and larger fruit. 



18. AMELAIVCHIER, Medic. June-bebby. 



Calyx 5-cleft. Petals oblong, elongated. Stamens numerous, short. Styles 

 5, united below. Fruit (pome) berry-like, the 5 cartilaginous carpels each di- 

 vided into 2 cells by a partition from the back ; the divisions 1 -seeded. — Small 

 trees or shrubs, with simple sharply serrated haves, and white flowers in ra- 

 cemes. (Ainelanciir is the popular name of A. vulgaris in Savoy.) 



1. A. Canadensis, Torr. & Gray. (Shad-bush. Service-beury.) 

 Calyx-lobes triangular-lance-form; fruit globular, purplish, edible (sweet, ripe 

 in June). — Along streams, &c. : common, especially northward. April, May. 

 — Varias exceedingly; the leading forms arc, — 



Var. Botryfs piu lit ; a tree 10° -30° high, nearly or soon glabrous; 

 leaves ovate-oblong, sometimes heart-shaped at the base, pointed, very sharply 

 serrate ; flowers in long drooping racemes ; the oblong petals 4 times the length 

 of the calyx. (Pyrus Botryapium, Willd.) 



11* 



