168 ROSACEA. ROSA. 



* * Seeds with shining stony testa : albumen very distinct : stipules 

 membranaceous, caducous. 



17. . Opnlaster. Carpels membranaceous, inflated, 2-valved, distinct, 

 often stipitate : flowers perfect, corymbose : leaves lobed. 



. * « * Seeds with membranous testa and no albumen : stipules 

 none, 

 -t- Calyx persistent : stamens perigynous : carpels several-seeded. 



18. Spiraea. Carpels cartilaginous, follicular, distinct : flowers perfect, 

 rarely polygamous : shrubs with simple serrate or incised leaves. 



19. Luetkea. Carpels membranaceous, 2-valved, distinct : low herbs 

 with biternately parted leaves and perfect flowers. 



-1- ■*- Calyx marcescent : stamens hypogynous : carpels few-seeded. 



20. Aruncus. Carpels cartilaginous, 1-valved, distinct : tall herbs with 

 ternately compound leaves and dioecious flowers. 



Tribe 1. Rosese Juss. Carpels many, with two suspended 

 ovules, one above the other, becoming cnistaceous, indehiscent, one- 

 seeded achenes, inserted on the whole inner surface of the thickened 

 torus or disk which lines the tube of the calyx. 



1 EOSA Tourn. L. Gen. n. 631. (Rose). 



Prickly shrubs with unequally pinnate leaves, adnate stipules 

 and large flowers in corymbs or solitary. Calyx urceolate, the 

 tube contracted at the mouth, at length fleshy or baccate, en- 

 closing the numerous distinct ovaries. Ovaries one-celled, with 

 two suspended ovules, one above the other, becoming one-seeded 

 indehiscent crustaceous or bony achenes, inserted on the whole 

 inner surface of the thickened disk that lines the tube of the 

 calyx, style terminal or nearly so, somewhat exserted, distinct or 

 connate above. 



* Sepals connivent after flowering and persistent. 



K. Nutkaiia Presl. Epimel. Bot. 203., Stems stout, 1-10 feet high^ 

 armed with stout straight or recurved spines, the branches sometimes un- 

 armed and the young shoots usually prickly : stipules rather broad, gland- 

 ular-ciliate ; leaflets 5-9, broadly elliptical to ovate or oblong or lanceolate, 

 usually rounded at base, serrate above the middle, 3^-2 inches long, finely 

 pubescent and more or less resinous beneath: flowers solitary or 2-3 to- 

 gether ; calyx-lobes lanceolate, acuminate and tipped with a lanceolate 

 entire foliaceous appendage, the whole 12-18 lines long, densely tomentose 

 inside, smooth or more or less glandular outside : petals broadly obovate 

 or obcordate, 12-16 lines long, nearly as broad : fruit globose, 6 lines long 

 or more, not contracted above into a neck. Common from Brit. Columbia 

 to California, Montana and Utah. 



R. . blanda Ait. Hort. Kew. ii, 202. Stems 1-2 feet higli, whoUy un- 

 armed, or usually with a few slender straight scattered prickles, sometimes 

 more densely prickly: stipules dilated, naked and entire, or slightly gland- 

 ular toothed above; leaflets 5-7, usually oblong-oblanceolate, mostly cune- 

 ate at base and shortly petiolulate, coarsely and simply toothed, glabrous 

 above, paler and glabrous or more or less pubescent beneath, not resinous 

 or very rarely slightly so, usually lar^e,, the terminal one %-2>(^ inches 

 long ; rachis pubescent, sometimes sparingly prickly : flowers large, corym- 

 bose or often solitary : sepals entire; 'shortly hispid or soHietimes naked : 

 fruit globose or with more or less of -a necK below the calyx, sometimes 



