Washington Native Plant Society: Starflower Image Herbarium

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Lonicera involucrata

Twinberry

At a Glance: Tall shrub with opposite leaves and pairs of small yellow flowers in leaf axils.

Height: Up to 10 feet (3 meters tall).
Growth Form: Shrub.
Stems: Slender brown stems with pithy centers and thin shredding bark.
Leaves: Opposite; leaf blades elliptic to lanceolate in shape with pointed tips, green.
Flowers: Tubular, yellow; in pairs with a greenish to maroon papery bract at base of each pair.
Flowering Period: April, May, June, July.
Fruits: Dark reddish-black berries in pairs surrounded by maroon bracts. Berries are not considered edible.


Photo © 2004, Starflower Foundation

Sun/Shade Tolerance	Hydrology	Elevation Range
full sun > 80% mostly sunny 60%-80% partial sun and shade 40%- 60% mostly shady 60%-80% full shade > 80%	wet moist dry	low elevation mid elevation sub-alpine high elevation

Soil Preferences
(data not available)

Habitat Preferences
Aquatic and Wetland: Ponds or lakes Shallow pools Sloughs Swales or wet ditches Seasonally inundated areas Marshes or swamps Aquatic bed wetlands Emergent wetlands Scrub-shrub wetlands Forested wetlands Bogs, fens Seeps, springs Shorelines and Riparian: Lake shores Bog margins Streams or rivers Stream or river banks Riparian corridors River bars Floodplains Bottomlands Alluvial areas	Saltwater Areas: In or near saltwater Mud flats Tidal areas Estuaries Saltmarshes Brackish water Seashores Coastal dunes or beaches Rocky or Gravelly Areas: Coastal bluffs Cliffs Rocky slopes Outcrops Crevices Glacial outwash Gullies Slide areas Sub-alpine and Alpine: Heaths Snow beds Tundra Avalanche tracks	Forests and Thickets: Forests and woods Open forests Coniferous forests Old growth forests Deciduous forests Mixed forests Nurse logs Forest edges, openings, or clearings Thickets Meadows and Fields: Pastures or fields Meadows or grassy areas Mossy areas Disturbed Areas: Roadsides Trailsides Logged sites Burned areas Disturbed sites

Wildlife Value
Berries Seeds Nectar for hummingbirds Nectar for butterflies Host for insect larvae Thickets and shelter Thorny or protective cover	Birds: Flowers provide nectar for hummingbirds. Berries are eaten by various birds.

Ethnobotanical Uses and Other Facts

(data not available)

Suggested References

The landscaping and restoration information provided on this page is taken from the Starflower Foundation Image Herbarium. All photographs © Starflower Foundation unless otherwise noted.