492 ROSACEAE (ROSE FAMILY) 



surfaces ; pedicels and sepals obscurely or not at all glandular. (R. hispidus, 

 var. suberectus Peck ; B. setosus of auth.. in part, not Bigel.; It. vermontanus 

 Blancbard ; R. semisetosus Blanchard?) Open places, e. Que. to N. Y. and 

 Mich. 



31. R. permixtus Blanchard. Recurving and soon prostrate ; stems (as well 

 as petioles, rhachis, pedicels, etc.} densely glandular-hispid and armed with 

 scattered stronger straightish or more often curved prickles; leaflets glabrous 

 above, velvety beneath, rather small, those of the flowering canes 2-6 cm. long; 

 racemes few-flowered, short ; flowers 1.5-2 cm. broad ; calyx glandular-hispid ; 

 petals oblong-spatulate ; fruit short-cylindric, with few large drupelets, sweet. 

 Dry soil in open places, s. e. Vt. 



32. R. tardatus Blanchard. Decumbent, becoming prostrate ; the subterete 

 slender stems with numerous straightish prickles, but with few or no glands; 

 petioles smooth or sparingly prickly ; leaflets smooth on both surfaces, those of 

 the flowering stems 4-10 cm. long ; racemes somewhat compound, corymbiform ; 

 pedicels glandular-hispid, occasionally setulose ; flowers 2 cm. broad ; petals 

 narrowly obovate ; fruit globose, of few large sour drupelets. Sandy soil, 

 York Co., Me. Perhaps merely a form of the next. 



33. R. jacens Blanchard. Similar, but the stem more glandular ; leaflets of 

 the flowering stems 2-5 cm. long ; sepals dorsally free from glands; fruit globose, 

 of a few sweet drupelets. Dry open places, s. w. N. H. 



34. R. hispidus L. Prostrate or nearly so ; the slender terete often elongated 

 stems more or less beset with retrorse prickles ; the branches suberect, 530 cm. 

 high ; leaflets glabrous on both surfaces, of firm texture, subcoriaceous, rather 

 dark green and somewhat shining above; racemes few-flowered, corymbiform; 

 rhachis and pedicels occasionally setulose ; flowers 1.5-2 cm. broad ; fruit small, 

 reddish-purple, of few small sour drupelets. Low woods and swampy meadows, 

 N. S. to s. w. Ont. and N. C., common. 



35. R. trivialis Michx. Prostrate ; stems terete, elongated, slender, armed 

 (as are also the petioles and often the peduncles) with broad-based flatfish short 

 hooked retrorse prickles, not conspicuously glandular ; leaflets coriaceous, ever- 

 green, elliptical, rather sharply serrate ; peduncles l-3-flowered, flowers 3-4 cm. 

 broad ; petals broadly obovate ; fruit cylindrical, of many drupelets. Dry 

 soil, Va. to Fla. and Tex. , near the coast. 



36. R. rubrisdtus Rydb. Similar ; the stems, petioles, and especially the 

 pedicels glandular-hispid with reddish or purplish hairs ; corymbs 3-Q-flowered ; 

 flowers 1.5-2.5 cm. broad; petals oblong-spatulate. Sandy soil, Mo. to La. 

 and Fla. 



37. R. vil!6sus Ait. (DEWBERRY.) Becoming prostrate; stems elongate, 

 subterete, rather woody., armed ttrith stout slender retrorse straightish prickles ; 

 fruiting branches upright, 1-3 dm. high, (\-~)3-l5-flowered ; leaflets rhombic- 

 obovate, doubly and rather finely serrate, acutish, membranaceous. smooth or 

 sparingly villous beneath ; flowers in leafy corymbiform racemes, 2-3 cm. broad ; 

 sepals not foliaceous ; fruit subglobose to short-cylindric, with few-many large 

 juicy drupelets. (R. canadensis of auth., not L.; R. procumbens Muhl.) Dry 

 open places, s. Me., westw. and southw., common. Var. RORIBACCCS Bailey. 

 (LucRETiA D.) A large-flowered extreme, with elongated pedicels,- thefloicers 

 4 cm. broad; sepals often foliaceous. W. Va., where doubtfully native ; and 

 in cultivation. 



Var. humifusus T. & G. Stems slender, less woody; flowering branches 

 chiefly l-flowered ; flowers large, 3-4 cm. broad. (R. Enslenii Trattinick ; R. 

 Baileyanus Britton ; R. subuniflorus Rydb.) Chiefly near the coast, from e. 

 Mass, southw. 



(Several recently proposed species are obviously related to and not very clearly 

 distinct from R. villosus and await further study.) 



38. R. invisus (Bailey) Britton. Similar, but stouter ; the canes less pro- 

 cumbent ; leaflets, especially those of the. vegetative shoots, simply and rather 

 coarsely toothed; pedicels long (becoming 1.6 dm. in length) ; sepals large, 

 fnliaceous. N. Y. to Kan. and southw. The original of several cultivated 

 Dewberries. 



