Leatherwood

Dirca palustris
Thymelaeaceae

Growth Habit

Shrub

Biocultural Value

Several Native American groups used the tough, pliant bark as a fastener or twisted it into cordage. Medicinally, it was employed as a kidney/urinary medicine, cathartic, emetic, and internal analgesic.

Poisonous
The bark, fruit, and roots of this plant are toxic. Some people have allergic reactions from contact with the bark. 

Wildlife Value

Leatherwood's yellow, petal-less flowers attract a variety of small to medium-sized bes in early spring, including carpenter bees (Ceratina spp.), cuckoo bees (Nomada cuneata), mason bees (Osmia lignaria), Halictid bees (Lasioglossum spp.), plasterer bees (Colletes inaequalis), and Andrenid bees (Andrena rugosa). Mourning cloak butterflies (Nymphalis antiopa) also visit the flowers seeking nectar. A number of insects feed on the bark and foliage, including the leaf-mining larva of a specialist moth, Leucanthiza dircella. Most mammalian herbivores avoid eating the toxic foliage. 

Poisonous

Yes

Location

Polson Preserve, Mundy Wildflower Garden

Cultivation

A 4-6' tall deciduous shrub with small, bell-shaped, lemon-yellow flowers in early spring. 
Light: part to full shade
Moisture and Soil: Prefers organically rich, moist, slightly acidic soil. Dislikes dry soils. 

Description

Much-branched, rather dense oval to rounded shrub when grown in cultivation in full sun. In the wild thehabit tends to be irregularly open and spreading. Flowers perfect, pale yellow, 3 to 4 per inflorescence,not outstanding but interesting due to their March to April flowering date. Bark light brown becoming oliveor darker, with conspicuous small white lenticels, very leathery.

Source of plant

Gardens North, Cornell Botanic Gardens, Orchid Gardens, Cornell Botanic Gardens

USDA Hardiness Zone

4

Special characteristics

flowering season, bark

Status

L3|S5|G4