Thalictrum venulosum (Veiny Meadow Rue)
|Also known as:||Northern Meadow-rue|
|Habitat:||part shade, sun; moist rocky or gravelly soil; prairies, fens, shores, open woods, thickets|
|Bloom season:||June - July|
|Plant height:||12 to 40 inches|
|Wetland Indicator Status:||GP: FAC MW: FAC NCNE: FACW|
|MN county distribution (click map to enlarge):|
|National distribution (click map to enlarge):|
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Male and female flowers are on separate plants. Flowers of both sexes are about 1/3 inch long and petal-less, with 4 or 5 egg-shaped, pale green to purple sepals. Female flowers are erect to nodding and have about 10 yellow to purplish to red pistils.
Leaves and stems:
Leaves are 3 or 4 times compound in groups of 3. Leaflets are about ¾ inch long and wide with 3 to 5 notches or shallow, rounded lobes, though the primarily lobes may be further notched. Lateral leaflets are very short stalked. The upper surface is hairless and the lower is sparsely glandular and/or minutely hairy. Basal leaves are long stalked. Stem leaves number 1 to 3, the lower long stalked, the leaf at the base of the first flowering branch stalkless or nearly so. Stems are erect and hairless.
The female flowers form clusters of dry seed, each seed less than ¼ inch long, oblong-elliptic, distinctly veined and often distinctly curved.
Veiny Meadow Rue resembles other Meadow Rue species in Minnesota, but is distinguished by leaves 3 or 4 times compound, only 1 to 3 stem leaves, leaflets with 3 to 5 lobes and usually sparsely glandular on the underside. It is a smaller plant than both Tall Meadow Rue (Thalictrum dasycarpum) and Purple Meadow Rue (Thalictrum revolutum), both of which have leaves 3 to 5 times compound and leaflets more consistently 2 or 3 lobed. More similar is Early Meadow Rue (Thalictrum dioicum), a primarily woodland species with leaves 1 to 4 times compound, leaflets with 3 to 12 lobes, longer stalks on the leaflets, and that finishes blooming about the time Veiny Meadow Rue starts.
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- Veiny Meadow Rue plant
- Veiny Meadow Rue plants
- Veiny Meadow Rue plant
- panicle of female flowers
- male flowers with red stamens
Photos courtesy Peter M. Dziuk taken in Marshall and Kittson counties.
Have you seen this plant in Minnesota, or have any other comments about it?