ROSA 121 



prickles hooked. Introduced from Asia, escaped from cultivation 

 and naturalized (Fig. 150). 



3. R^ eglanteria L. Sweetbrier. Eglantine. Stems slender, 

 1-2 m. high, or forming longer wands, armed with strong hooked 

 prickles, sometimes with scattered smaller ones; sepals tardily 

 deciduous from the scarlet or orange hip. Introduced from Europe, 

 escaped from cultivation and naturalized (Fig. 151). 



4. R^ canina L. Dog Rose. Stem 3 m. high or less, coarse, 

 with large recurved prickles; sepals promptly falling from the 

 ellipsoid scarlet hip. Introduced from Europe, escaped from cul- 

 tivation and naturalized (Fig. 152). 



5. R^ virginiana Mill. Pasture Rose. Stems erect, often tall 

 and thick, 2-20 dm. high, with large usually curved prickles; 

 sepals soon deciduous from the red fruit. Thickets, Newfoundland 

 to Ontario, south to Alabama and Missouri (Fig. 153). 



6. R^ palustris Marsh. Swamp Rose (R. Carolina L. ). Stems 

 usually tall, climbing or scrambling, 3-25 dm. high, with thick 

 straight or curved prickles; fruit globose or depressed -globose, 

 about 8 mm. high, glandular-hispid; sepals deciduous from the 

 depressed-globose or ellipsoid fruit. Swamps and wet thickets. 

 New Brunswick to Ontario and Minnesota, south to Florida and 

 Arkansas (Fig. 154). 



7. R. Carolina L. Low Pasture Rose . (R. serrulata of 

 authors, not Raf. ). Stems erect, 3-9 dm. high; prickles needle- 

 like, straight; sepals deciduous from the fruit. Dry soil, Florida 

 to Texas, north to Nova Scotia, Minnesota, and Nebraska (Fig. 155). 



8. R. acicularis Lindl. Northern Rose . Canes 3-12 dm. high, 

 densely bristly and acicular-prickly; sepals persisting and erect 

 in fruit. Rocky slopes, Quebec to Yukon, south to Colorado, South 

 Dakota, Michigan, and West Virginia. 



PRUNUS L. (Rosaceae) 



Deciduous shrubs and trees. Twigs slender or moderate, sub- 

 terete or somewhat angled at the nodes, sometimes sharp-pointed; 

 pith round or angled, pale or brown, continuous. Buds solitary 

 or multiple, sessile, subglobose or ovoid, with about 6 visible 

 scales. Leaf-scars alternate, half-round or elliptical, small; 

 bundle-traces 3, usually minute; stipule-scars or vestiges present. 



