152 American Midland Naturalist Monograph No. 2 



spherical, about 2 mm. long; roots tuberous-thickened; woods, chiefly in 



s. and w. III. July-Sept. [/I. striata sensu Bickn., non Michx.} 



A. rostellata Wallr. 



1. Principal leaflets 11-17, lanceolate, pubescent and glandular-granuliferous 



beneath; fruiting calyx 4-5 mm. long; moist ground. July-Sept 



A. parviflora Wallr. 



11. RuBUS L. — Bramble 



1. Stems herbaceous, not at all prickly; leaflets 3, rarely 5; fruit red, globose; 



bogs, n.e. 111. May-June. [R. triflorus Richards.} Dwarf Raspberry 



R. ptibescens Raf. 



1. Stems more or less woody, biennial or perennial, usually prickly or bristly. 



2. Leaves whitish-tomentulose beneath; petals 5-6 mm. long, not longer than 

 the sepals; fruit red or purplish, easily separating from the receptacle. 

 (Raspberries). 



3. Stems glaucous, recurved, rooting at the tips, not stoloniferous, with 

 stout hooked prickles; inflorescence corymbiform, the pedicels prick- 

 ly; fruit purplish black; moist ground, common. May-June. Black 

 Raspberry R. occidentalis L. 



3. Stems not glaucous, bristly-prickly, stoloniferous; inflorescence race- 

 mose; fruit red. 



4. Pedicels and calyx glandular-setose; wet ground and thickets, n. HI. 

 May-June. [R. idaeus L. var. aculeatissimus (C. A. Mey.) Regel 

 & Tiling} Wild Red Raspberry R. strigosus Michx. 



4. Pedicels and calyx tomentulose and often with small recurved prick- 

 les, not glandular; roadsides and near dwellings; occasionally per- 

 sisting; nat. from Eur. May-June. Cultivated Raspberry 



R. idaeus L. 



2. Leaves variously pubescent or glabrous, but not whitish-tomentose beneath; 

 fruit black when ripe, adhering to the cone-like receptacle. 

 5. Stems erect or arching, mostly 1-2 m. tall; petals 1-1.5 cm. long. 

 (Blackberries) . 

 6. Stems more or less prickly, not bristly, the prickles not numerous, 

 confined to the angles of the stem. 

 7. Leaflets laciniate; panicle 5-30-flowered, prickly and pubescent. Of 

 European origin; cult., and sometimes escaped to roadsides and 

 waste places. Urbana, G. N. ]ones 16419. June-July. Evergreen 

 Blackberry R. lacmiatus (West.) Willd. 



7. Leaflets serrate or lobed, not laciniate. 



8. Peduncles and pedicels with stalked glands, also usually pubes- 

 cent, and sometimes bearing small prickles; inflorescence race- 

 mose, not leafy, usually standing well beyond the foliage, each 

 pedicel subtended by a bract; open woods, pastures, roadsides, 

 and along fences, common. May-June. [R. nigrobaccus 

 Bailey} R. allegheniensis Porter 



