Coefficient of Conservatism:
Coefficient of Wetness:
Usually in moist, shaded places: moist thickets, swamps (coniferous or deciduous), borders of bogs and marshes; occasionally in dry forests, in acid soil.
Once the prostrate or trailing habit is known, this complex is easily distinguished from the R. flagellaris complex, which shares the habit but has strong, broad-based prickles (sometimes sparse), basically deciduous, thin, ± dull leaves with more acute or acuminate leaflets, and larger flowers. In R. hispidus the leaves are firm-textured and evergreen with mostly obovate leaflets, usually ± glossy when fresh but duller and darkish green when dry. The inflorescence in both complexes is few-flowered, the pedicels usually ± strongly ascending. The longest prickles in R. hispidus are often ca. 1.5 times as long as the diameter of the cane where they arise, so even if slightly broad-based they are noticeably slender and elongate; in the R. flagellaris complex, the prickles have broad bases and are at most ca. 1.2 times as long as the diameter of the cane.
The inflorescence in R. hispidus is only rarely glandular, and then only sparsely so. In the R. flagellaris complex the inflorescence is frequently glandular and in the R. setosus complex it is usually distinctly glandular-bristly. The latter has a broader inflorescence than R. hispidus.