Thalictrum dioicum L. - Early Meadow Rue


 

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Thalictrum dioicum - (image 1 of 6)

 

Taxonomy

Family: Ranunculaceae

Habitat

Mesic, shaded woods.

Associates

 

 Distribution

Quebec west to Manitoba, south to SC, GA, AL, and MO.

Morphology

Herbaceous perennial 30-70 cm tall from a subterranean, fibrous-rooted crown. Leaves thin, glabrous, usually with 3 lobes each with 1-3 teeth, the petioles elongate; the cauline leaf subtending the lowest flowering branch 3-6 cm; stipules of upper leaves broad, mostly much wider than long. Plant dioecous, the flowers all or mostly unisexual; filaments and anthers yellowish or greenish-yellow. Achenes 4 mm, sessile or subsessile, strongly ribbed, straight and mostly symmetrical. 

Notes

Flowers April to May, usually when deciduous tree begin to leaf out

Wetland indicator: Facultative Upland +

The first image is of a staminate (male) plant. The 3rd image is a close up of staminate flowers, while the 4th shows pistillate (female) flowers. The last two images are of the fruit. To the untrained eye this species might be mistaken for Blue Cohosh.

References

Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. Second Ed.

The New York Botanical Garden. Bronx, NY

 

Swink, F. and G. Wilhelm. 1994. Plants of the Chicago Region.
Indiana Academy of Science. The Morton Arboretum. Lisle, Illinois.

 


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 Michael Hough 2009