Apple Family. 49 



A. mollis (T. A: G.) Britton. Stem 1-4 feet high, villous below, pubescent 

 or ea nescent above, paniculately branched; roots tuberous; leaflets 5-11, nar- 

 rowly oblong- to obovate. velvety pubesa nt beneath, crenate to dentate, inter- 

 posed leaf-segments mostly in single pairs. Dry woods; July-September; fre- 

 quent; Johnson, Van Buren, Ringgold, and Page counties. 



A. parviflora Soland. Stem 2—5 feet high, virgately branched, densely hir- 

 sute with brownish hairs; roots not tuberous; leaflets crowded. 11-19, lanceo- 

 late or linear-lanceolate, serrate: flowers numerous, in long racemes; petals 

 small. Prairies and woods; July-September; frequent; Muscatine, Lee, De- 

 catur. Ringgold, and Page counties. 



ROSA I. Erect or climbing shrubs, usually prickly, with alternate odd- 

 pinnate leaves, aduate stipules, and solitary or corymbose showy flowers. 

 Calyx-tube cup-shaped or urn-shaped, constricted at the throat, fleshy in fruit, 

 usually 5-lobea. Petals usually 5, spreading. Stamens many, inserted with 

 the petals into the edge of the ho'low annular disk. Achenes several, enclos- 

 ed in the fruiting calyx-tube. A difficult genus and perfect specimens are 

 requisite for positive determination. 



* Sepals persistent, 



F^. arKansana Porter. Stems 1-2 feet high, densely prickly, infrastipular 

 spines none: stipules narrow; leaflets 7-11, oval or obovate. sharply serrate; 

 outer sepals lobed; fruit globose, glabrous. Prairies; June-July; common. 

 Often mistaken for the following species. 



F^. blanda Ait Stems 2-4 feet high, entirely unarmed or with a few prick- 

 les: stipules dilated; leaflets 5-7, short-stalked, oval or obovate, obtuse, ser- 

 rate; sepals entire, hispid. Specimens from Emmet, Winneshiek, and John- 

 son counties have been referred to this species but the determinations are 

 doubtful. The species has been reported from several localities. 



F^. Woodsii Lindl. Stems 4—30 inches high; armed with slender straight 

 spines or naked above; infrastipular spines present; stipules rather 

 broad, entire; leaflets 5-9, oval or obovate, sharply serrate, somewhat glau- 

 cous beneath; sepals lobed or entire; fruit globose or globose-ovoid, glabrous, 

 sometimes glaucous. Thicket near a swamp; Fremont county. 



* * Sepals deciduous. 



R. humilis Marsh. Stems 1-3 feet high, more or less prickly, infrastipular 

 spines present; stipules narrow; leaflets 5 or 7, ovate or obovate, coarsely and 

 sharply serrate: outer sepals more or less lobed: fruit globose or depressed- 

 globose, glandular hispid. Woods; May-July; frequent; Muscatine. Johnson, 

 and Henry counties. 



F^. rubiginosa L. Sweetbrier. Eglantine. Stems 3-5 feet high, armed with 

 stout recurved spines; leaflets 5-7, ovate or oval, doubly serrate, glandular- 

 pubescent and resinous beneath, aromatic. Introduced; June-July; infre- 

 quent: Muscatine, Henry, and Decatur counties. 



POMACEAE L. Apple Family 



Trees or shrubs, with alternate petioled leaves, small free deciduous 

 stipules, and regular perfect flowers, solitary or in cymes or racemes. Ca- 

 lyx 5-lobed or 5-toothed, tube adnate to the ovary. Petals usually 5, clawed. 

 Stamens few to many. Ovary usually 5-celled. Carpels 1-5, wholly or 

 partially united, 1-2-ovuled. Styles 1-5. Fruit a pome. 

 * Cells of the ovary as many as tke styles. 

 Pvrus. Pome large, fleshy ; carpels papers 

 Crataegus. Pome small: carpels bony, 1-5. 



