ROSACEAE 189 



Dryas octopetala. Mountain Avens. I. July-August. E. Prostrate rock 

 plant. Ls. alternate, ov., i, heart-shaped base, blunt-ended, with a few large 

 teeth or lobes, white below, slender-stalked. Fls. i, white, solitary on erect very 

 slender stalk, K8, C8, Fruit of numerous seed vessels, each with long silky tail. 

 North Europe (including Britain), North America, (Fig. 87 j.) 



Fallugia paradoxa. 5. Summer. D. Branchlets slender, greyish white. Ls. 

 wedge-shaped, f, cut into narrow oblong lobes running into 1. -stalk, downy all 

 over, margins recurved. Fls, i|, white, solitary or in few-flowered racemes, K5, 

 C5, Aoo, G 00. Fruit with feathery tails, California. (Fig. 34 b.) 



Kerria japonica. (Corchorus Japonicus). Jew's Mallow. 6. April-May. D. 

 Branchlets slender, zigzagged, with 1. at each angle. Ls. alternate, ov., 4, long- 

 pointed, sharply double-toothed, heart-shaped base, hairless above, hairy below. 

 Fls. ih, yellow, solitary, slender-stalked, K5, C5, A go, G5-8. Fruit of 5-8 dry, 

 brownish-black seed vessels. China. (Fig. 89 G.) 



Variety variegata. Ls. with white edge. 



Y ariety flore pleno. Fls. double. (Fig. 89 G.) 



Margyricarpus setosus. Pearl Fruit, i. Summer. E. Prostrate, Branches 

 yellow, partly covered by sheathing bases of 1. -stalks. Ls. alternate, pinnate; 

 Iflts. linear, I or more, green, margins recurved. Fls. small, solitary, inconspicuous, 

 no petals. Fruit a small white berry. Chile. (Fig. 49 d.) {M. alatus is very similar, 

 but with winged fruits.) (Fig. 49 e.) 



Neviusa alabamensis. Snow-in-Summer. 6. June-July. D. Ls. alternate, 

 ov., 3, pointed, double-toothed, hairless or nearly so. Fls. i, without petals; 

 sepals with toothed lobes; stamens white, numerous, and conspicuous. Alabama. 

 (Fig. 93 e.) 



PoTENTiLLA FRUTicosA. Shrubby Cinquefoil. 4. May-September. D. Bark 

 shreddy. Ls. pinnate, 5-fol.; Iflts. lane, i, pointed, entire, Fls. i, yellow, solitary, 

 5-petalled, short-stalked. Northern Hemisphere. (Fig. 14 k.) 



PuRSHiA TRIDENTATA. ID. May. D, Ls. alternate or in clusters, obov., i, 

 3-lobed at apex, whitish and hairy below, tapering base, Fls. |, yellowish, K5, C5, 

 A25, Gi or 2, solitary. Fruit J, spindle-shaped, projecting beyond persistent 

 calyx. West North America. (Fig. 29 e.) 



Rhodotypos kerrioides. White Kerria. 6. June-July. D. Branches erect, 

 hairless. Ls. opposite, ov., 4, long-pointed, deeply and unevenly toothed, promi- 

 nently parallel-veined, dark green above, hairy below. Fls. 2, white, solitary, 

 K4, C4, A 00, G4. Fruit of four hard black berries. China and Japan. (Fig. 61 f.) 



ROSA. Rose. Stems usually with thorns or prickles. Ls. alternate, pinnate; 

 stipules expanded into two pointed wings. K5, C5, A 00, Gi-co. Ovaries enclosed 

 in fleshy urn-shaped receptacle which becomes the fruit, 



{a) Styles project conspicuously beyond mouth of 



receptacle 



R. arvensis. Trailing Wild Rose. June. Stems long and very slender. Lflts. 

 ov., 2, simply toothed, glaucous below. Fls. i|, white, often solitary, 

 styles united into a column almost as long as stamens. Fruit egg-shaped, 

 dark red. Europe (including Britain). (Fig. 16 b.) 



