MIDDLESEX FLORA. 33 



ROSA, Tourn. 



R. Carolina, L. SWAMP EOSE. 

 Common. June-July. 



R. lucida, Ehrh. DWARF WILD ROSE. 

 Very common. May-June. 



R. humilis, Marsh. (R. lucida, Man., in part). 

 Arlington (Mrs. P. D. Richards) ; Weston (L. L. Dame) ; Concord 

 (Walter Deane) ; Ashby (Dr. C. W. Swan). June. 

 "In dry soil and on rocky slopes and mountain sides. Stems usu- 

 ally low (1 to 3 ft.), and more slender, less leafy, with straight 

 slender spines, spreading or sometimes reflexed; stipules narrow, 

 rarely somewhat dilated; leaflets as in the last, but usually thinner 

 and paler, glabrous or usually more or less pubescent, especially 

 beneath, and also the rachis (often prickly) ; flowers very often 

 solitary, the outer sepals always more or less lobed, often pinnately 

 so ; fruit as in the preceding." Watson in Revision of Roses of N. 

 A., Proc. of Amer. Acad., Vol. XX, 1885. 



R. nitida, Willd. (R. lucida, Ehrh., Man., in part.) 

 Medford, Lexington, Woburn, Bedford, et al. Occasional in low 

 grounds. June. 



" Usually low, nearly or quite glabrous throughout, the straight 

 slender spines often scarcely stouter than the prickles which cover 

 the stem and branches more or less thickly; stipules usually 

 dilated ; leaflets bright green and shining, usually narrowly oblong 

 and acute at each end, sometimes broader and obtuse, small (the 

 terminal % to 1^ in. long) ; flowers usually solitary (rarely 2 or 3) , 

 bright red (\%. to 2)^ in. broad), the slender pedicels, receptacle, 

 and calyx densely hispid or glandular-prickly; sepals entire; fruit 

 globose, 4 or 5 lines broad." Watson in Revision of Roses of N. A., 

 Proc. of Amer. Acad., Vol. XX, 1885. 



R. RUBIGINOSA, L. SWEET-BRIER. 



Widely distributed, but not very common. June-July. Nat. from 

 Eu. 



R. MICRANTHA, Smith. SMALLER-FLOWERED SWEET-BRIER. 



Occasional. June-July. Nat. from Eu. Too near R. rubiginosa, 

 and not separated from it by some botanists. 



JR. cinnamomea, L. 



Persistent in old gardens, and occasionally spontaneous. For de- 

 scription, see Wood's Bot. & Fl. 



CRAT^EGUS, L. 



C. Oxyacantha, L. ENGLISH HAWTHORN. 



Occasionally spontaneous, but hardly naturalized. May-June. 

 Adv. from Eu. 



