UW Burke Herbarium species comparison

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Rubus ulmifolius

Rubus vestitus

elm-leaf blackberry

European blackberry
Habit Strong perennial with arching to trailing branches up to 3 m. long, well armed with straight, flat prickles up to 7 mm. long.
Leaves

Leaves alternate, partially evergreen, 3- to 5-foliate;

stipules lanceolate, 5-10 mm. long;

leaflets ovate to rotund-ovate, acuminate, 5-10 cm. long, doubly serrate, green and glabrous above, paler and pubescent beneath.
Flowers

Flowers numerous in flat-topped panicles, hairy and stipitate-glandular;

calyx white-woolly, the 5 lobes reflexed, lanceolate, acuminate, up to 1 cm. long;

petals 5, white, pinkish tinged, 10-15 mm. long;

stamens at least 75;

pistils numerous, styles glabrous.
Fruits

Drupelets coherent, and with the receptacle forming a globular blackberry about 1.5 cm. thick.

Rubus ulmifolius

Rubus vestitus
Identification notes Differs from Rubus discolor by having straight instead of curved spines, and stipitate-glandular instead of eglandular inflorescence.
Flowering time May-July April-June
Habitat Fields, thickets, forest edge, and other disturbed areas. Roadsides and waste ground.
Distribution
Occurring west of the Cascades crest in Washington; southwestern British Columbia to California and Nevada; also in New Jersey.
[WildflowerSearch map]
[BONAP county map]
Occurring in scattered locations on both sides of the Cascades crest in Washington; British Columbia to Oregon, also reported from Idaho.
[WildflowerSearch map]
[BONAP county map]
Origin Introduced Europe and northern Africa Introduced from Europe
Conservation status Not of concern Not of concern
Sibling taxa
R. allegheniensis, R. arcticus, R. bifrons, R. idaeus, R. laciniatus, R. lasiococcus, R. leucodermis, R. nigerrimus, R. nivalis, R. parviflorus, R. pedatus, R. pensilvanicus, R. pubescens, R. spectabilis, R. ursinus, R. vestitus
R. allegheniensis, R. arcticus, R. bifrons, R. idaeus, R. laciniatus, R. lasiococcus, R. leucodermis, R. nigerrimus, R. nivalis, R. parviflorus, R. pedatus, R. pensilvanicus, R. pubescens, R. spectabilis, R. ulmifolius, R. ursinus
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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