View source for Rubus cultivated American dewberry

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Rubus cultivated American dewberry. A variable group of American origin, from the native species: trailing or prostrate plants, the weak slender canes lying on the ground or sometimes making low mounds, mostly prickly or thorny: lfts. usually 3: infl. short and mostly interrupted or leafy, or the fls. axillary, pubescent or glabrous: fr. blackberry-like.—The native sources of the dewberries are to be sought in the following more or less marked species-segregations; R. procumbens, Muhl. (R. villosus, Ait., not Thunb.) (Figs. 3501, 3502), of the northeastern states and south to Va., is the prevailing dewberry of open fields away from the Coastal Plain, with canes usually several feet long and usually bearing stout recurved prickles: lfts. usually narrowed at the base, nearly or quite glabrous: fls. in the upper axils. Var. roribaccus (R. villosus var. roribaccus, Bailey) is the Lucretia dewberry type.—R. invisus, Brit. (Figs. 3503, 3504; also Fig. 1250, Vol. II). Probably has the range of R. procumbens: canes strong and terete, somewhat ascending and often making mounds or piles of canes and herbage, not very prickly: lfts. large, those on the sterile shoots with large simple serratures: infl. dichotomous. R. geophilus, Blanchard, is to be placed in this group.—R. Baileyanus, Brit. (R. villosus var. humifusus, Torr. & Gray). More slender, little prickly: lfts. mostly broad at base, pubescent beneath: lvs. or bracts in the infl. simple. Northeastern states. R. arenicolus, Blanchard, is probably to be associated with this.—R. Enslenii, Tratt, Nantucket and L. I. southward, on the Coastal Plain and perhaps westward, is a soft-caned weak plant with small loose black fr. that is probably little if at all involved in the origin of the horticultural dewberries.

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