| Author | L.H. Bailey | |
| Distribution | This taxon is usually subsumed within R. allegheniensis, but Weakley (2022), BONAP, and a few other entities have it as a valid species. Weakley's (2022) map shows it as "rare" and only in the Mountains. However, several specimens are from the extreme upper Piedmont. SERNEC shows only a few specimens, all from Carnegie Museum -- indicating that other specimens lie unstudied in a number of other herbaria.
Ranges from southern Canada south to western NC, TN, and KS.
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| Abundance | Rare to uncommon -- perhaps, in the Mountains and northwestern Piedmont. However, very incompletely known. It seems best to give a State Rank of SU (Undetermined), as there must be a number of un-located collections in a good handful of herbaria, considering that perhaps only Carnegie has truly been examined carefully. | |
| Habitat | Presumably in typical brushy areas -- old fields, wooded edges, thickets. | |
| Phenology | Not given. | |
| Identification | It is differentiated from R. allegheniensis by having "Inflorescences racemose, flaring widely towards the tip, or leafy and < 2× as long as wide; calyx lobes > 7 mm long, > 3 mm wide", as opposed to having "Inflorescences narrowly racemose, usually appearing almost leafless (the bracts much smaller than the leaves, at least 2× as long as wide; sepals 5-7 (-8) mm long, 2.0-3.5 mm wide", in R. allegheniensis, according to Weakley (2022). | |
| Taxonomic Comments | See above.
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| Other Common Name(s) | May be written as Old Field Blackberry | |
| State Rank | [SU] | |
| Global Rank | G5 | |
| State Status | [W7] | |
| US Status | | |
| USACE-agcp | FACU link |
| USACE-emp | FACU link |
