IUCN threat status:

Not evaluated

Comprehensive Description

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Highbush Blackberry has a similar appearance to Rubus allegheniensis (Common Blackberry). Both of these species produce elongated racemes of flowers (or drupes) that have small and insignificant bracts. While the racemes of Highbush Blackberry have stalks with woolly non-glandular hairs, the racemes of Common Blackberry have stalks with sticky-glandular hairs. The drupes of Common Blackberry are usually longer (½-¾" ) than those of Highbush Blackberry, its leaflets are usually more broad in shape, and the petals of its flowers are slightly wider and tend to overlap. With the exception of the presence or absence of glandular hairs, these differences are more subtle than dramatic. Another common species, Rubus pensilvanicus (Leafy-Bracted Blackberry), produces its flowers (and drupes) in flat-headed corymbs that have large leafy bracts. As a result, its flowers and fruits are sometimes partially hidden by these bracts. In the Rubus genus, there has been excessive taxonomic splitting in the past. As a result, some older species of blackberry are now regarded as variants of current species of blackberry; Rubus ostryifolius and several others are considered scientific synonyms of Rubus argutus (Highbush Blackberry). Other common names of this species are Sawtooth Blackberry, Sharp-Toothed Blackberry, and Florida Prickly Blackberry.

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© John Hilty

Source: Illinois Wildflowers

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