Flora of North America species comparison

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Rubus setosus

bristly blackberry, ronce sétuleuse, setose blackberry
Habit Shrubs, 2–10(–15) dm, armed.
Stems

biennial, erect to arching, rarely creeping, not node- or tip-rooting, sparsely to moderately hairy, sparsely to densely long-, rarely short-stipitate-glandular, glands rounded to flattened, not pruinose;

prickles absent or sparsely to moderately dense, erect to retrorse, weak, slender, 1–3(–5) mm, narrow-based;

bristles sparse to dense, erect to retrorse, green to reddish, narrow, semirigid, sometimes flexible, not gland-tipped.
Leaves

deciduous, ternate or palmately compound, sometimes ± lustrous;

stipules filiform to lanceolate, 5–20(–38) mm;

leaflets (3–)5, terminal obovate or elliptic to rhombic, 4.5–11.5 × 2–7 cm, base cuneate to narrowly rounded, unlobed, margins moderately, coarsely serrate to doubly serrate or serrate-dentate, apex acute or acuminate to short-attenuate, abaxial surfaces unarmed or with bristles on midvein, sparsely to moderately hairy, eglandular or sparsely to moderately sessile- to long-stipitate-glandular along larger veins.
Inflorescences

terminal on short shoots, sometimes appearing axillary, 5–15(–20)-flowered, racemiform, cymiform, or thyrsiform.
Pedicels

prickles or bristles sparse to dense, erect to retrorse, moderately to densely hairy, moderately to densely stipitate-glandular.
Flowers

bisexual;

petals white, obovate to oblanceolate, 6–13 mm;

filaments filiform;

ovaries glabrous.
Fruits

black, globose, 0.7–1.5 cm;

drupelets 5–25, strongly coherent, separating with torus attached.
2n

= 14, 21, 28, 35.

Rubus setosus
Phenology Flowering Jun–Jul(–Aug).
Habitat Open woodlands, savannas, prairies, meadows, disturbed areas, dry to wet soil
Elevation 0–1000 m (0–3300 ft)
Distribution
from FNA
CT; DC; DE; IA; IL; IN; MA; MD; ME; MI; MN; NH; NJ; NY; OH; PA; RI; VA; VT; WI; WV; NB; NF; NS; ON; PE; QC
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[BONAP county map]
Discussion

Rubus setosus is identified by erect to arching, rarely creeping, not tip-rooting, terete primocanes, always setose but variable in density, and deciduous primocane leaves that are often palmately compound with five leaflets. Cultivated plants sometimes alternate from erect to creeping (or vice-versa) in successive years, depending on changing soil conditions.

The following nothospecies names are based on putative hybrids involving Rubus setosus and: R. allegheniensis (R. ×abbrevians Blanchard, R. ×aculiferus Fernald, R. ×adenocaulis Fernald, R. ×angustifoliatus L. H. Bailey, R. ×ascendens Blanchard, R. ×atwoodii L. H. Bailey, R. ×clausenii L. H. Bailey, R. ×flavinanus Blanchard, R. ×frondisentis Blanchard, R. ×perspicuus L. H. Bailey, R. ×ravus L. H. Bailey); R. canadensis (R. ×miscix L. H. Bailey [based on R. ×peculiaris Blanchard (not R. peculiaris Sampaio)]); R. flagellaris (R. ×alter L. H. Bailey, R. ×arcuans Fernald & H. St. John, R. ×biformispinus Blanchard, R. ×bigelovianus L. H. Bailey, R. ×bracteolifer Fernald, R. ×jacens Blanchard var. specialis L. H. Bailey, R. ×laevior (L. H. Bailey) Fernald [based on R. permixtus var. laevior L. H. Bailey], R. ×multiformis Blanchard, R. ×setospinosus L. H. Bailey, R. ×severus Brainerd ex Fernald); R. hispidus (R. ×adjacens Fernald, R. ×grandidens L. H. Bailey, R. ×harmonicus L. H. Bailey, R. ×jacens Blanchard, R. ×parlinii L. H. Bailey, R. ×spiculosus Fernald, R. ×tardatus Blanchard, R. ×tholiformis Fernald, R. ×trifrons Blanchard, R. ×zaplutus L. H. Bailey); R. pensilvanicus (R. ×wisconsinensis L. H. Bailey).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 9, p. 53.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Rubeae > Rubus
Sibling taxa
R. allegheniensis, R. arcticus, R. bartonianus, R. bifrons, R. caesius, R. canadensis, R. chamaemorus, R. cuneifolius, R. deliciosus, R. flagellaris, R. glaucifolius, R. hispidus, R. idaeus, R. illecebrosus, R. laciniatus, R. lasiococcus, R. leucodermis, R. neomexicanus, R. nivalis, R. niveus, R. nutkanus, R. occidentalis, R. odoratus, R. parviflorus, R. parvifolius, R. pascuus, R. pedatus, R. pensilvanicus, R. phoenicolasius, R. pubescens, R. repens, R. saxatilis, R. spectabilis, R. trivialis, R. ulmifolius, R. ursinus, R. vestitus
Synonyms R. apparatus, R. beatus, R. benneri, R. bicknellii, R. boottianus, R. condignus, R. deaneanus, R. discretus, R. dissensus, R. dissimilis, R. electus, R. exter, R. fulleri, R. groutianus, R. gulosus, R. hispidoides, R. hispidus var. suberectus, R. jejunus, R. junceus, R. junior, R. lawrencei, R. mediocris, R. navus, R. nocivus, R. notatus, R. ortivus, R. perinvisus, R. racemiger, R. regionalis, R. reravus, R. rotundior, R. schneideri, R. semisetosus, R. spectatus, R. stipulatus, R. uniformis, R. univocus, R. vermontanus, R. viridifrons, R. wheeleri
Name authority Bigelow: Fl. Boston. ed. 2, 198. (1824)
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Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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