Burke: Rubus ursinus vs. Rubus vestitus

	Rubus ursinus	Rubus vestitus
	Pacific blackberry, trailing blackberry, dewberry, Douglasberry	European blackberry
Habit	Dioecious perennial with slender, trailing stems up to 6 m. long, abundantly armed with slender, hooked prickles.	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 trifoliate, the lateral leaflets ovate-lanceolate, 3-7 cm. long, doubly serrate; terminal leaflet larger, deeply 3-lobed.	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	Floral branches several, 1-3 dm. long, erect, bearing several leaves and 1-several flat-topped flower clusters, the inflorescence with stalked glands; calyx hairy and glandular, the 5 lobes lanceolate, 5-11 mm. long; staminate petals 5, white, elliptic-spatulate, 7-11 mm. long, with 75-100 stamens; pistillate petals broader and shorter, with numerous pistils.	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 purplish-black, coherent, attached to the elongate receptacle; fruit up to 2.5 cm. long.	Drupelets coherent, and with the receptacle forming a globular blackberry about 1.5 cm. thick.

	Rubus ursinus	Rubus vestitus
Identification notes		Differs from Rubus discolor by having straight instead of curved spines, and stipitate-glandular instead of eglandular inflorescence.
Flowering time	April-August	April-June
Habitat	Open to fairly dense woodlands, thickets, and balds, sea level to middle elevations in the mountains; common in logged areas.	Roadsides and waste ground.
Distribution	Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, east to Montana. [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	Native	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. ulmifolius, 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	Local floras: BC, CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria, Turner Photog. WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: BC, OR, WA Local Web sites: Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Rubus vestitus

Pacific blackberry, trailing blackberry, dewberry, Douglasberry

European blackberry

Habit

Dioecious perennial with slender, trailing stems up to 6 m. long, abundantly armed with slender, hooked prickles.

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 trifoliate, the lateral leaflets ovate-lanceolate, 3-7 cm. long, doubly serrate;

terminal leaflet larger, deeply 3-lobed.

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

Floral branches several, 1-3 dm. long, erect, bearing several leaves and 1-several flat-topped flower clusters, the inflorescence with stalked glands;

calyx hairy and glandular, the 5 lobes lanceolate, 5-11 mm. long; staminate petals 5, white, elliptic-spatulate, 7-11 mm. long, with 75-100 stamens; pistillate petals broader and shorter, with numerous pistils.

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 purplish-black, coherent, attached to the elongate receptacle;

fruit up to 2.5 cm. long.

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