ROSACEAE. 141 



5, yellow, much smaller than the calyx-lobes; stamens 5, on the 

 margin of the villous disk; carpels 5-10, on short pubescent 

 stipes; styles lateral. 



Sibbaldia proctunbens L. Perennial, sparsely villous, S-IS cm. high; 

 leaflets 3, rather thick, cuneate, 3-S-toothed at the truncate apex, 1-2 cm. 

 long; peduncles usually shorter than the leaves; petals yellow, acute. Highest 

 peaks of the Blue Mountains. 



201. FRAGARIA. Strawberry. 



Acaulescent perennial herbs, propagating by runners; leaves 

 alternate, basal, tufted, 3-foliolate, with obovate serrate leaflets; 

 flowers polygamo-dioecious, white, few, in corymbs or racemes, 

 on naked scapes; calyx deeply 5-lobed, with 5 alternate bractlets; 

 petals 5, obovate, short-clawed; stamens numerous, in 1 row; 

 style lateral; carpels numerous; receptacle much enlarged and 

 fleshy in fruit, conical, scarlet, bearing the small turgid akenes 

 on the surface. 



Scapes shorter than the leaves; akenes sunk in pits in the fruit. 7^. platypetala. 

 Scapes longer than the leaves; akenes not sunk in pits. F. bracteata. 



Fragaiia platypetala Rydb. Rootstocks stout; scapes 10-15 cm. high, 

 mostly shorter than the leaves; petioles silky-villous ; leaflets somewhat 

 glaucous, elliptic or obovate, broadly cuneate at base, coarsely toothed above 

 the middle, glabrous or nearly so above, appressed silky-villous below, 2-5 cm. 

 long; runners long, rather stout, 12-16 mm. broad; petals nearly orbicular, 

 longer than the sepals; fruit hemispherical, the akenes sunk in shallow pits. 

 In meadows and open woods. 



Fragaria bracteata Heller. Rootstocks stout; scapes 10-20 cm. high, 

 usually exceeding the leaves; whole plant sparsely silky-villous; leaflets 

 broadly obovate, cuneate at base, coarsely dentate; lateral leaflets oblique; 

 flowers 1.5-2 cm. broad; petals nearly orbicular, somewhat longer than the 

 spreading sepals; fruit oblong, the akenes on the surface. In open woods, 

 common. 



202. COMARUM. 



Stout dark green nearly glabrous perennial herbs ; leaves alter- 

 nate, pinnate, with large stipules; flowers large, cymose or 

 solitary, terminal or also axillary; calyx deeply 5-lobed with 5 

 narrow bractlets; petals shorter than the calyx-lobes, acute, 

 purple; stamens numerous, on the large pubescent disk; pistils 

 numerous on the pubescent receptacle which becomes spongy in 

 fruit; styles lateral ; akenes glabrous. 



Comarum palustre L. Perennial; stems decumbent, rooting below, 30-90 

 cm. long; leaves pinnately 5-7-foliolate; leaflets elliptic or oblong, serrate, 

 obtuse, more or less pubescent beneath, 5-8 cm. long; cyme few-flowered; 

 flowers dark-purple. In swampy places, especially borders of lakes. Marshall, 

 Piper. 



