![Twinberry fruiting in Jim Popenoe's yard, 23 August 2001 Photo of twinberry fruit](Twinberry-fruit.jpg)
Jim P.
Twinberry
(Lonicera involucrata)
![Twinberry in flower at Palmer's Point in state park, 17 May 1980 Photo of twinberry in flower](Twinberry.jpg)
J. Popenoe
Twinberry flowers
Twinberry is an upright deciduous shrub 5 to 10 feet (1.5 to 3 m) tall. It has opposite leaves and paired yellow flowers that develop into paired, black, bitter, inedible berries.