Burke: Rubus ursinus vs. Rubus allegheniensis

	Rubus ursinus	Rubus allegheniensis
	Pacific blackberry, trailing blackberry, dewberry, Douglasberry	Allegheny blackberry, common blackberry
Habit	Dioecious perennial with slender, trailing stems up to 6 m. long, abundantly armed with slender, hooked prickles.
Leaves	Leaves trifoliate, the lateral leaflets ovate-lanceolate, 3-7 cm. long, doubly serrate; terminal leaflet larger, deeply 3-lobed.
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.
Fruits	Drupelets purplish-black, coherent, attached to the elongate receptacle; fruit up to 2.5 cm. long.

	Rubus ursinus	Rubus allegheniensis
Flowering time	April-August	June-July
Habitat	Open to fairly dense woodlands, thickets, and balds, sea level to middle elevations in the mountains; common in logged areas.	Damp thickets, peatlands, and forest openings.
Distribution	Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, east to Montana. [WildflowerSearch map] [BONAP county map]	Occurring west of the Cascades crest in Washington; southwestern British Columbia to Washington and California (but apparently not Oregon), east to Idaho; also from the central Great Plains to eastern North America. [WildflowerSearch map] [BONAP county map]
Origin	Native	Introduced from central and eastern North America
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. 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, R. vestitus
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, 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 allegheniensis

Pacific blackberry, trailing blackberry, dewberry, Douglasberry

Allegheny blackberry, common blackberry

Habit

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

Leaves

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

terminal leaflet larger, deeply 3-lobed.

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.

Fruits

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

fruit up to 2.5 cm. long.

Rubus ursinus

Rubus allegheniensis

Flowering time

April-August

June-July

Habitat

Open to fairly dense woodlands, thickets, and balds, sea level to middle elevations in the mountains; common in logged areas.

Damp thickets, peatlands, and forest openings.

Distribution

Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, east to Montana.

[WildflowerSearch map]

[BONAP county map]

Occurring west of the Cascades crest in Washington; southwestern British Columbia to Washington and California (but apparently not Oregon), east to Idaho; also from the central Great Plains to eastern North America.

[WildflowerSearch map]

[BONAP county map]

Origin

Native

Introduced from central and eastern North America

Conservation status

Not of concern

Sibling taxa