Thalictrum revolutum DC.
Family: Ranunculaceae
Thalictrum revolutum image
John Hilty  
Stems erect, coarse, 50-150 cm. Leaves cauline, proximal leaves petiolate, distal sessile; petioles and rachises stipitate-glandular to glabrous. Leaf blade 1-4×-ternately compound; leaflets grayish or brownish green or dark to bright green, lanceolate, elliptic, ovate, reniform to obovate, apically undivided or 2-3(-5)-lobed, 9-60 × 5-50 mm, length 0.9-2.7(-5.25) times width, usually leathery, margins often revolute, lobe margins entire; surfaces abaxially with sessile to stalked glands or muriculate to whitish papillose. Inflorescences racemes to panicles, elongate, many flowered; peduncles and pedicels sometimes stipitate-glandular. Flowers usually unisexual, staminate and pistillate on different plants; sepals 4(-6), whitish, ovate to oblanceolate, (2-)3-4 mm; filaments white, slightly clavate, 2.5-7.8 mm, ± flexible; anthers (0.7-)1.2-2.7(-3) mm, blunt to apiculate. Achenes 8-16, sessile or slightly stipitate; stipe 0.2-1.7 mm; body lanceolate to ellipsoid, 3.5-5 mm, prominently veined, usually stipitate-glandular; beak ± persistent, linear-filiform, (1-)1.5-3.3(-5) mm, ± equal to length of achene body. 2 n = 140. Flowering spring-summer (Mar-Jul). Dry open woods, brushy banks, thickets, barrens, and prairies; 30-2000 m; Man., Ont., Que.; Ala., Ariz., Ark., Colo., Conn., Del., D.C., Fla., Ga., Ill., Ind., Iowa, Ky., La., Md., Mass., Mich., Minn., Miss., Mo., Nev., N.J., N.Mex., N.Y., N.C., Ohio, Okla., Pa., R.I., S.C., S.Dak., Tenn., Tex., Vt., Va., W.Va., Wis., Wyo. Glandular individuals of Thalictrum revolutum have been called var. glandulosior . They are seen throughout the range of the species and do not represent a distinct lineage. Occasional glandular plants with unusually short anthers are often misidentified as T . pubescens . Material of this species from the western United States has been incorrectly assumed by previous authors to be T . dasycarpum , because T . revolutum is not included in floras of that region.

From Flora of Indiana (1940) by Charles C. Deam
Infrequent to frequent throughout the state in moist soil. A form with yellow roots (when collected) is generally found in dry soil on wooded slopes and less often in moist, sandy places. I think the form, which usually has only sessile glands, should be separated as a species or variety. It may be that it is Greene's Thalictrum amabilis, the type of which I have not seen. I have 70 sheets of this species from Indiana and I have failed to make a record of the color of the roots of many specimens but I think that I made a record when the color was yellow and did not when no color was evident.

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Indiana Coefficient of Conservatism: C = 5

Wetland Indicator Status: FAC

Plants stout, odorous, 1-2 m; lfls variable in shape and size, mostly subcoriaceous and prominently reticulate-veiny beneath, narrowly revolute, finely pubescent beneath with short, capitate-glandular hairs (rarely glabrous and glaucous); filaments capillary or slightly dilated above; anthers 1.8-2.7 mm; stigmas 2-3.5 mm; achenes ellipsoid or lanceolate, 4-6 mm, usually minutely glandular- hairy; 2n=ca 134. Dry woods and prairies; Mass. to s. Ont., O., Ill., and Mo., s. to Fla., Ala., and Ark. June-July.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
Thalictrum revolutum image
John Hilty  
Thalictrum revolutum image
Paul Rothrock  
Thalictrum revolutum image
Paul Rothrock  
Thalictrum revolutum image
Paul Rothrock  
Thalictrum revolutum image
John Hilty  
Thalictrum revolutum image
Paul Rothrock  
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