14 WOODY PLANTS OF MANHATTAN 



P. Virginiana, L Spec. 1753. Choke-Cherry . 



Twigs rather large; leaf-scars more or less triangular, comparatively 

 small, sometimes with only one bundle-scar. Buds pointed; scales rive or 

 six, glabrous, obtuse. A shrub or small tree rare in thickets. 



^4 RUBUS, Tourn. Inst. 1700; L Spec. 1753. 



Declining suffruticose plants, with biennial or short lived perennial 

 canes, armed with recurved prickles, rive-ranked leaf-scars and three bun- 

 dle-scars. 



Twigs glaucous, cylindrical. R occidental!*. 



Twigs not glaucous, five-ridged R villosus. 



R. Occident alis, L. Spec. 1753. Black Raspberry. 



Pith yellow, cylindrical; twigs red-brown; leaf-scars crescent or 

 semicircular, considerably raised, the leaf frequently breaking away 

 irregularly, leaving a long stump without a distinct scar. Buds oblong 

 with several acutish scaler, more or less pubescent at apex. Common in 

 upland woods, along fences, etc. 



R. villosus. Ait. Hort- Kew. 1789. Blackberry. 



Pith greenish, five-rayed; twigs purple, glabrous; prickles from a flat- 

 tened base, sometimes straight; leaf -scars V-shaped, base of petiole often 

 persistent; buds conical, strongly divergent, single or two or three super- 

 posed, scales few, somewhat pubescent. Infrequent. 



25 ROSA, Tourn. Inst. 1700; L. Spec. 1753. 



Prickly shrubs with white pith, V-shaped leaf-scars and three bundle 

 scars. 



Twigs green; climbing R. setigera. 



Twigs red; a low shrub R. Arkansana. 



R. setigeka, Michx Fl. 1803. Climbing Rose. 



Twigs green; prickles flattened, recurved above an oval, white, well 

 defined base; buds strongly divergent, oblong, obtuse, pink, scales two or 

 three. Rare. 



R. Arkansana, Porter, PI. Colorado, 1874. Wild Rose. 



A low shrub, usually not more than two feet high, with slightly glau- 

 cous twigs, armed with straight prickles from an elliptical base; leaf- 

 scars very narrow, nearly half encircling the stem. Bud about ti mm. 

 above the leaf-scar, with three or four red or black scales, pubescent at 

 tip. Common on prairie and open woods. 



26 PYRUS, Tourn. Inst. 1700; Spec. 1753. 



P. CORONARIA, L. Spec. 1753. Wild Crab-apple 



A small tree with red, glabrous twigs or in vigorous sprouts pubescent 

 at apex, five-ranked, very narrow, open V-shaped leaf-scars, three bun- 

 dle-scars and obsolete stipule-scars. Buds flattened, appressed, acutish; 



