ROSACEAE (ROSE FAMILY) 



79 



in length, branched at the summit, white, woolly; leaflets 5, wedge- 

 shaped, more or less pinnatifid, silvery-white beneath; flowers rather 

 large with yellow petals; stamens 20. Barren fields. June to Sep- 

 tember. 



P. Anserina, Silver Weed. Perennial, spreading by slender run- 

 ners; leaves white, tomentose, silky villous; 

 young radical ones pinnate; leaflets 7 to 21, 

 oblong; peduncles axillary, one-flowered. 

 Marshes and river banks. June to August. 



P. canadensis, Common CirfQUEFOiL. 

 Somewhat erect, becoming 7 dm. high or 

 procumbent. Stem hirsute bearing solitary 

 flowers on axillary peduncles; leaves with 3 

 leaflets, which are apparently 5 on account 

 of the parting of the lateral leaflets; leaflets 

 oblong, serrate, more or less hairy beneath. 

 Sandy soil. May to July. 



ROSA 



Shrubs, usually prickly, with pinnate leaves, conspicuous stipules 

 and urn-shaped calyx tube. Petals are broad and numerous with 



stamens inserted on the edge of the 

 tube, and hairy ovaries becoming hard 

 achenes. 



R. blanda, Wild Rose. Stems becom- 

 ing IS dm. high, unarmed, or occasionally 

 with prickles; stipules dilated; leaflets 5 

 to 7, oblong-lanceolate, wedge-shaped at 

 base; flowers large clustered or solitary; 

 sepals hispid, entire; sepals connivent af- 

 flowering, persistent. Rocks and beaches. 

 R. Carolina, Swamp Rose. Stems be- 

 coming 25 dm. high, with stout, often curved prickles; stipules long 

 and very narrow ; leaflets S to 9, narrow, oblong, and acute at each 

 end; sepals spreading after flowering, falling from the mature fruit. 

 Borders of swamps and streams. 



R. humilis, Pasture Rose. Stems low, not exceeding 9 dm. in 

 height, with straight, slender prickles; stipules narrow; leaflets liiostly 

 7, smooth; flowers often solitary; sepals spreading after flowering, 

 outer ones more or less lobed. Dry soil, or on rocky slopes. 



Rosa blanda. Wild rose. 



