152 EOSACBAE. 



elliptic: sepals mostly acute: petals mostly 2-2.5 mm. long: mature hypan- 

 thium-body about 3 mm. wide. Occasional, in woods and on dry banks. Sum. 



5. A. rostellata Wallr. Stems nearly glabrous or sparingly loose-pubescent: 

 lower leaves with 3-9, usually 5, primary leaflets: sepals acute or obtuse: 

 corolla 4-6 mm. wide : mature hypanthium turbinate, 2.5-3 mm. long. S. 

 Kather common, in low thickets and fence rows. Schists. Sum. 



6. A. gryposepola Wallr. Stems with spreading hairs: lower leaves with 5-9, 

 usually 7, primary leaflets: sepals acuminate: corolla 8-12 mm. wide: mature 

 hypanthium broadly turbinate, 5-6 mm. long. Common, in thickets. Sum. 



15. SANGUISORBA [Eupp.] L. Perennial, or rarely annual, caulescent 

 herbs. Leaf-blades unequally pinnate. Flowers in dense heads or spikes. 

 Hypanthium angled, unarmed. Sepals petal-like, deciduous. Petals wanting. 

 Filaments mostly clavate. 



1. S. canadensis L. Plants 3-4 dm. tall: leaflets 7-15; blades oblong, ovate- 

 oblong, or oblong-lanceolate, 1.5-8 cm. long, serrate: spikes 3-15 cm. long: 

 sepals oval or oval-ovate, varying to oblong or cuneate, about 2 mm. long, 

 mucronate : achenes about 3 mm. long. Not very common, in swamps. 

 Sum. BURNET. 



16. ROSA [Tourn.] L. Prickly shrubs, sometimes vine-like. Leaf -blades 

 unequally pinnate. Flowers solitary or in corymbs, often showy. Hypanthium 

 urceolate. Sepals more or less foliaceous. Petals 5, broad. Stamens many. 

 Fruits enclosed in the pulpy hypanthium. Sum. EOSE. 



Sepals persistent and erect : stems and branches unarmed or nearly so, except the 



bristly shoots. 1. R. Solanderi. 



Sepals deciduous, or if persistent, spreading or recurved : stem 



and branches prickle-armed. 

 Achenes borne only on the bottom of the hypanthium : shoots 



bristly : prickles infrastipular. 



Bades of the leaflets serrulate : prickles short and curved. 2. R. palustris. 

 Blades of the leaflets serrate, often coarsely so : prickles 



straight, or if curved, elongate. 

 Flowers solitary or nearly so : leaflets 5-7 : spines 



slender, straight. 3. R. Carolina. 



Flowers corymbose : leaflets 7-9 : spines stout, often 



curved. 4. R. virginiana. 



Achenes borne on the sides and on the bottom of the hypan- 

 thium : shoots prickly : spines scattered. 



Styles pubescent : fruits globular to oval. 5. R. rubiginosa. 



Styles glabrous : fruits ovoid to flask-shaped. 6. R. micrantha. 



1. R. Solanderi Tratt. Bushy shrub 1.5 m. tall or less, the prickles wanting or 

 few and small: leaflets 5-7; blades thickish, oblong to oblong-lanceolate or 

 broadest above the middle, mostly 2-3 cm. long, serrate, often slightly pubes- 

 cent beneath : flowers in corymbs, or solitary : hypanthium glaucous, sometimes 

 slightly bristly: sepals narrowly lanceolate, more or less dilated at the apex, 

 hispid, persistent: fruits depressed, 1-2 cm. in diameter, red. [R. ~blanda Lindl. 

 Not Ait.] Susquehanna valley. Eare, in moist places. 



2. R. palustris Marsh. Bushy shrub 1-3 m. tall, the prickles stout, recurved: 

 leaflets 5-9, commonly 7; blades membranous, elliptic to elliptic-obovate or 

 oblanceolate, 2.5-7 cm. long, acute or obtuse at the apex, serrulate, gla- 

 brous, or pubescent beneath: flowers in terminal corymbs or rarely solitary: 

 hypanthium glandular: sepals lanceolate or linear-lanceolate, acuminate, often 

 dilated at the apex, rarely lobed, spreading or reflexed at maturity, deciduous: 

 fruits subglobose or depressed, 7-9 mm. in diameter, red, more or less glandu- 

 lar. [E. Carolina L. 2 ed. Sp. PI.] Common, in low thickets and swamps. 



3. R. Carolina L. Bushy shrub 2-24 dm. tall, the prickles straight: leaflets 

 5-7, usually 5; blades rather leathery, elliptic, oval, or ovate-lanceolate, or 



