Burke: Rubus ursinus vs. Rubus parviflorus

	Rubus ursinus	Rubus parviflorus
	Pacific blackberry, trailing blackberry, dewberry, Douglasberry	thimbleberry
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 parviflorus
Flowering time	April-August	April-July
Habitat	Open to fairly dense woodlands, thickets, and balds, sea level to middle elevations in the mountains; common in logged areas.	Forest openings and edge, thickets, meadows, and riparian corridors from sea level to the subalpine.
Distribution	Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, east to Montana. [WildflowerSearch map] [BONAP county map]	Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east to Alberta, the Rocky Mountains, and Great Lakes region. [WildflowerSearch map] [BONAP county map]
Origin	Native	Native
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. 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, 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

Rubus parviflorus

Pacific blackberry, trailing blackberry, dewberry, Douglasberry

thimbleberry

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 parviflorus

Flowering time

April-August

April-July

Habitat

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

Forest openings and edge, thickets, meadows, and riparian corridors from sea level to the subalpine.

Distribution

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

[WildflowerSearch map]

[BONAP county map]

Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east to Alberta, the Rocky Mountains, and Great Lakes region.

[WildflowerSearch map]

[BONAP county map]

Origin

Native

Conservation status

Not of concern

Sibling taxa