Thalictrum amphibolum

Greene

Syst. Nat. 1: 173. 1817, not T. revolutum Le Lièvre 1873.

Common names: Skunk meadow-rue wax-leaved meadow-rue purple meadow-rue
Endemic
Synonyms: Thalictrum amphibolum Greene Thalictrum hepaticum Greene Thalictrum moseleyi Greene Thalictrum revolutum var. glandulosior B. Boivin
Treatment appears in FNA Volume 3.

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. 2n = 140.


Phenology: Flowering spring–summer (Mar–Jul).
Habitat: Dry open woods, brushy banks, thickets, barrens, and prairies
Elevation: 30-2000 m

Distribution

V3 1043-distribution-map.gif

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.

Discussion

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.

Selected References

None.

Lower Taxa

None.
... more about "Thalictrum amphibolum"
stipitate +  and sessile +
0.27 cm2.7 mm <br />0.0027 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
blunt +  and apiculate +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.27 cm2.7 mm <br />0.0027 m <br />) +
Marilyn M. Park +  and Dennis Festerling Jr. +
Greene +
cuneate +, truncate +  and cordate +
Leucocoma +  and Undefined sect. Leucocoma +
0.33 cm3.3 mm <br />0.0033 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
straight +
persistent +
linear-filiform +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.33 cm3.3 mm <br />0.0033 m <br />) +
stipitate-glandular +
lanceolate;ellipsoid +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
globose;cylindric +
Skunk meadow-rue +, wax-leaved meadow-rue +  and purple meadow-rue +
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. +  and Wyo. +
30-2000 m +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.78 cm7.8 mm <br />0.0078 m <br />) +
pistillate +  and staminate +
showy +  and inconspicuous +
unisexual +
0 cm0 mm <br />0 m <br /> (41 cm410 mm <br />0.41 m <br />) +
stipitate +, sessile +  and aggregate +
falcate;ovoid;obovoid +
sessile;stalked +
Dry open woods, brushy banks, thickets, barrens, and prairies +
compound +  and simple +
whorled +, opposite +  and alternate +
brownish green or dark +  and bright green +
0.9-2.7(-5.25) +
0.9 cm9 mm <br />0.009 m <br /> (6 cm60 mm <br />0.06 m <br />) +
reniform +  and obovate apically undivided or 2-3(-5)-lobed +
0.5 cm5 mm <br />0.005 m <br /> (5 cm50 mm <br />0.05 m <br />) +
palmate +  and pinnate +
crenate;entire +
(1-)2-200-flowered +
stipitate-glandular +
stipitate-glandular +
distinct +
conspicuous +
reduced +
stipitate-glandular;glabrous +
Flowering spring–summer (Mar–Jul). +
1 +  and 16 +
stipitate-glandular;glabrous +
not arillate +  and stalked +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
not persistent +
distinct +
ovate +  and oblanceolate +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
ribbed +  and veined +
50 cm500 mm <br />0.5 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
persistent +
muriculate;whitish papillose +
Thalictrum amphibolum +, Thalictrum hepaticum +, Thalictrum moseleyi +  and Thalictrum revolutum var. glandulosior +
Thalictrum amphibolum +
Thalictrum sect. Leucocoma +
species +
herbaceous +  and woody +