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Genus: Rubus — blackberry

Hybrids are very common in Rubus. It is a difficult genus that has been treated either by lumping very diverse plants into "megaspecies," or by recognizing a large number of species based upon only one character difference. This key uses an intermediate approach, following Hodgdon and Steele (1966). It is important to distinguish between primocanes and floricanes when using the key. The form of the primocane stem should be checked during or after flowering on the floricanes, since early growth form can be different. Bristles are less than 0.5 mm thick at the base, small-based prickles are 0.3–1.2 mm thick, and broad-based prickles are 0.8–4 mm thick. References: Hodgdon and Steele (1966), Steele and Hodgdon (1970).


Rosaceae (rose family)

This genus’s species in New England

Visit this genus in the Dichotomous Key