ROSACEA. 455 



style itself. Seed erect ; radicle of straight embryo inferior. — Herbs, 

 often creeping or stoloniferous ; rhizome perennial ; radical leaves 

 imparipinnate or pinnatisect ; cauline few, often 3-foliolate or bract- 

 like ; stipules adnate to sheathing base of petiole ; flowers solitaiy, or 

 usually few cymoso-corymbose on erect scapes. {All cold and temperate 

 regions.) See p. 365. 



16. Dryas L. — Flowers hermaphrodite (of Geiim), 8-9-merous. 

 Achenes (of Geuiii) terminated by barbate plumose persistent styles. 

 Radicle of embryo inferior. — Humble caespitose undershrubs ; stem 

 short thick ; leaves simple alternate ; stipules adnate to petiole ; 

 flowers solitary terminal pedunculate. {Alpine temperate and Arctic 

 regions of Northern Hemisphere?) See p. 367. 



17. Cowania Don. — Mowers hermaphrodite or polygamous ; 

 receptacular glands sacciform or turbinate, glandular outside, lined 

 by a glandular disk. Sepals 5, ecalyculate, inserted in throat of 

 receptacle ; prsefloration imbricated. Petals 5, imbricated. Stamens 

 GO (of the Rosacecs), inserted in throat of receptacle. Carpels 5-oo 

 and achenes of Dryas. Seed ascending ; albumen thin ; radicle of 

 straight fleshy embryo inferior, — Bushy shrubs ; leaves alternate 

 3-5'fid or partite ; stipules adnate to short petiole. {California, 

 Mexico.) See p. 3 68. 



18. Fallugia Endl. — Flowers hermaphrodite (of Coivania) ; 

 receptacle hemispherical obconical ; calyx 5-bracteolate ; disk 

 villous. Carpels go and achenes of Dryas. Seed erect ; embryo 

 exalbuminous ; radicle inferior. — A much-branched erect shrub; 

 twigs virgate ; leaves alternate irregularly 3-5-lobed or pinnatifid ; 

 stipules adnate to petiole ; flowers solitary on long peduncles or few 

 cymose. {Mexico.) See p. 368. 



19. Chamaebatia Benth. — Flowers hermaphrodite (of Coer<2w/«) ; 

 receptacle glandular outside, disciferous within ; sepals imbricate 

 ecalyculate; petals as many and stamens co (of the Rosacea). 

 Carpel 1, free inserted in bottom of receptacle ; ovary 1-celled ; 

 style subterminal, deeply furrowed down one side ; edges of furrow 

 reflexed stigmatiferous ; ovule 1, suberect; raphe ventral; micro- 

 pyle inferior extrorse. Achene coriaceous included in persistent 



