Thalictrum dioicum early meadow rue Ranunculaceae THDI; Bx, pb, wv (Yost et al. 1991); Q, cu (Greller 1985); R;


Thalictrum (Accessed 3/2017).

Thalictrum dioicum is a perennial herb to 70 cm tall, from a subterranean root crown, roots associated with VA mycorrhizas (Brundrett and Kendrick 1988); stems hollow. 

Leaves alternate, 3 times compound delicate, usually not expanded when flowers bloom; long-stalked, waxy pale blue-green, thin, stipules of upper leaves wider than long, half-moon-shaped, all leaflets stalked, blades widest obove middle, mostly with 5-9 blunt lobed or rounded-teeth.  

Flowers greenish, dioecious (males and females on different plants; no petals, sepals thin, pale, sometimes purplish, to 0.4 cm long, stamens drooping, anthers yellowish, stigma purple; inflorescence widely branched; blooming April-May. 

Fruit a small head of dry achenes, each to 0.4 cm, ridged and furrowed, tip beaked

Wetland status: FAC.

Frequency in NYC: Infrequent.

Origin: Native.

Habitat: Open moist meadows, edges, rocky, open woods.