ROSACEAE (ROSE FAMILY) 



81 



oblong-ovate, cut-serrate; petals white, as long as the bristly-hispid 

 calyx ; fruit light red, falling off whole from the dry receptacle. 

 Thickets. May to July. 



R. occidentalis, BLACK RASPBERRY. Glaucous shrubs, with stems 

 recurved and armed with hooked prickles, not bristly ; leaflets mostly 

 3, ovate, coarsely double-serrate; petals white, shorter than the sepals; 

 fruit purple-black, falling off whole from the dry receptacle. Thickets 

 and fence rows. May, June. 



R. odoratus, PURPLE FLOWERING RASPBERRY. Unarmed shrubs, the 

 branches, stalks, and calyx bristly with glandular hairs; leaves simple, 

 3 to 5 lobed, the middle lobe prolonged ; flowers large and showy ; 

 petals rounded, purple rose-color; fruit large and red, separating from 

 the receptacle as in all raspberries. Rocky woods. June to August. 



R. triflorus, DWARF RASPBERRY. Low and herbaceous, ascending 

 or trailing, unarmed ; leaves with 3 or 5 leaflets, which are rhombic- 

 ovate or ovate-lanceolate, acute at both ends, thin and smooth ; petals 

 small, erect, white or pink; fruit red, not separating easily from re- 

 ceptacle. Damp woods. May to 

 July. 



R. allegheniensis, TALL 



BLACKBERRY. Armed shrubs, 

 reaching 2 m. in height, the old 

 stems purplish and with stout 

 prickles ; leaves palmately com- 

 pound with 3 or 5 leaflets, which 

 are villous above and velvety be- 

 neath ; branchlets, pedicels, etc., 

 glandular-pubescent ; fruit sub- 



cyclindric, blackish, not separating from the fleshy receptacle, 

 thickets and clearings. May to July. 



Rubus allegheniensis, Tall blackberry. 



Open 



R. hispidus, SWAMP BLACKBERRY. Prostrate or nearly so, the 

 slender stem beset with retrorse prickles ; leaflets thickish, dark green 

 or shining above; racemes few-flowered; fruit small, reddish-purple. 

 Moist woods and swampy meadows. 



R. villosus, DEWBERRY. Becoming prostrate, the rather woody stem 

 armed with stout retrorse prickles; fruiting branches upright; leaflets 

 thin, doubly serrate, flowers in leafy racemes ; fruit blackish, with few 

 to many large drupelets. Dry, open places. 



SPRING FLORA 6 



