130 
ROSACEJE. (ROSE FAMILY.) 
§ 2. AdenorXchis, DC.— Leaves simple , the midrib beset with glands 
along the upper side: cymes compound: styles united at the bast . 
fruit berry-like. 
3. P. arbutifdlia, L. (Choke-berry.) Leaves oblong or 
obovate, finely serrate with callous teeth ; fruit pear-shaped, or when 
ripe globular. — Var. 1. erythrocarpa has the flower-clusters and 
lower surface of the leaves woolly, at least when young, and red or 
purple fruit. Var. 2. melanocarpa is nearly smooth, with purplish- 
black fruit.— Damp thickets, common. May, June. — Shrub 2°-3° 
high. Flowers white, or tinged with purple. Fruit small, mawkish. 
§ 3. Sorbus, Tourn. — Leaves odd-pinnate : cymes compound: styles 
separate: fruit berry-like . 
4. P. Americana, DC. (American Mountain-Ash.) Leaf¬ 
lets 13 - 15, oblong-lanceolate, pointed, sharply serrate with pointed 
teeth, smooth when full-grown ; cymes large and flat. — Swamps and 
mountain woods, common northward : also a low, smaller-fruited va¬ 
riety on the Alleghanies southward. June. — A slender shrub or 
low tree, with white blossoms; greatly prized in cultivation for 
its ornamental clusters of scarlet fruit in autumn, remaining through 
the winter. — Very much like the European Rowan-tree (P- 
aucuparia). 
20. AMELANCHIER, Medic. June-berry. 
Calyx 5-cleft. Petals oblong, elongated. Stamens numerous, 
short. Styles 5, united below. Fruit (pome) berry-like, the 5 
cartilaginous carpels each imperfectly divided into 2 cells by a par* 
tition from the back ; the divisions 1-seeded. — Small trees or 
shrubs, with simple sharply serrated leaves and white flowers m 
racemes. (Amelancier is the popular name of A. vulgaris m 
Savoy.) 
1. A. Canadensis, Torr. & Gr. (Shad-bush. Service-ber¬ 
ry.) Woolly when young, at length smooth: calyx-lobes triangular- 
lance-form; fruit globular, purplish, edible (sweet, ripe in June).— 
Varies exceedingly; the leading forms are, Var. 1. BotryA.pi^ m • a 
tree, with the leaves soon smooth, ovate-oblong, sometimes heart- 
shaped at the base, pointed, very sharply serrate; flowers in l° n S 
drooping racemes ; the oblong petals 4 times the length of the ca yx* 
(Pyrus Botryapium, Willd .) Var. 2. oblongif6lia : a shrub, wit 
oblong leaves, usually woolly during flowering, the racemes and p € 
tals shorter. Var. 3. rotcndif6lia : a shrub or tree, with broader 
leaves, 6 - 10-flowered racemes, and smaller petals than in var. L 
Var. 4. alnif6lia : shrub, with the roundish leaves very obtuse or 
notched at both ends, and serrate above the middle only, the racemes 
