492 ROSACE AE (ROSE FAMILY) 



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

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

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

 Mich. 



31. R. permfxtus 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, coryinbiform ; 

 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, 5-30 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 1-3-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 3-9-flowered ; 

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

 and Fla. 



37. R. villbsus Ait. (DEWBERRY.) Becoming prostrate; stems elongate, 

 subterete, rather woody, armed with stout slender retrorse straightish prickles; 

 fruiting branches upright, 1-3 dm. high, (I-}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. RORIBA.CCUS Bailey. 

 (LUCRETIA D.) A large-flowered extreme, with elongated pedicels; the, flowers 

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

 in cultivation. 



Var. humifiisus 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 1.5 dm. in length) ; sepals large, 

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

 Dewberries. 



