ROSACEA. 449 



GENERA. 



I. ROSE^. 



1. Rosa T. — Flowers regular hermaphrodite ; receptacle urceolate 

 or ventricose, throat constricted. Calyx 4-5-leaved ; leaves entire 

 dentate or pinnatisect, deciduous or persistent ; prajfloration imbri- 

 cate, usually quincuncial. Petals 4, 5, shortly unguiculate, imbri- 

 cate, usually deciduous. Disk lining receptacle glandular, very 

 often silky ; mouth thickened into a ring almost closing receptacle. 

 Stamens ^^0, cc- seriate ; filaments free inserted outside ring of disk ; 

 anthers 2-celled introrse, dehiscing longitudinally. Carpels co, 

 rarely few, inserted near bottom of receptacle, sessile or stipi- 

 tate ; styles subterminal, or more frequently more or less ventral, 

 exsei-ted, free or united together into a single mass ; apex 

 capitate stigmatiferous ; ovules 1, 2 in each ovary, suspended 

 on ventral angle, one usually rudimentary abortive ; micropyle 

 superior extrorse. Fruit multiple ; achenes cc, included in bac- 

 cate receptacle, glabrous or silky or bearded on both sides, or 

 more usually on that next the style. Seed pendulous ; testa 

 membranous; embryo thick fleshy; radicle superior; cotyledons 

 plano-convex. — Shrubs, erect sarmentose or climbing, usually acu- 

 leate, glabrous silky or glandular-pilose ; leaves alternate impari- 

 pinnate, more rarely 1-foliolate, or efoliolate with leafy stipules ; 

 leaflets usually serrate ; stipules adnate to sheathing base of petiole ; 

 flowers solitary or in subcorymbose cymes. {A/l temperate and sub- 

 alpine regions.) See p. 335. 



II. AGRIMONIES. 



2. Agrimonia T. — Flowers hermaphrodite ; receptacle turbinate, 

 constricted in throat, bearing outside hooked prickles or 5 alter- 

 nisepalous (stipulaceous) bractlets. Calyx 5-partite, finally valvate. 

 Stamens 5 alternipetalous, or a^ in 5 alternipetalous sets, free, 

 inserted in mouth of receptacle. Disk lining receptacle ; margin thick- 

 ened contracted. Carpels 2, 3, sessile, inserted in bottom of receptacle ; 



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