Thalictrum venulosum

Trelease

Proc. Boston Soc. Nat. Hist. 23: 302. 1886.

Common names: Veiny meadow-rue early meadow-rue
Endemic
Treatment appears in FNA Volume 3.

Stems erect, 20-50 cm, glabrous, from rhizomes. Leaves basal and cauline; cauline 1-3, those proximal to inflorescence petiolate, those subtending panicle branches sessile. Leaf-blade 3-4×-ternately compound; leaflets obovate to orbiculate, apically 3-5-lobed, 5-20 mm, lobe margins crenate, surfaces abaxially glabrous or glandular-puberulent. Inflorescences terminal, panicles, narrow and dense, many flowered. Flowers: sepals greenish white, lanceolate or broadly ovate to elliptic or obovate, 2-4 mm; filaments colored, not white, (1.8-) 3-5.5 mm; anthers 2-3.5 mm, blunt to mucronate; stigma commonly yellowish. Achenes 5-17, erect to spreading, not reflexed, nearly sessile; stipe 0.1-0.3 mm; body often distinctly curved, elliptic-oblong, nearly terete to slightly flattened, adaxial surface 3-4 (-6) mm, glabrous to glandular, veins distinct, not anastomosing-reticulate; beak 1.5-2.5 (-3) mm.


Phenology: Flowering early summer-mid summer (Jun–Aug).
Habitat: Prairies, riparian woods, and coniferous, deciduous, and mixed forests
Elevation: 600-3700 m

Distribution

V3 1164-distribution-map.gif

Alta., B.C., Man., N.W.T., Ont., Que., Sask., Yukon, Colo., Idaho, Minn., Mont., Nebr., Nev., N.Mex., N.Dak., Oreg., S.Dak., Utah, Wash., Wis., Wyo.

Discussion

Thalctrum venulosum is similar to T. confine and T. occidentale. Careful field studies are needed to clarify the relationships among these taxa.

Selected References

None.

Lower Taxa

None.
... more about "Thalictrum venulosum"
not reflexed +, erect +  and spreading +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
glabrous +  and glandular +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
blunt +  and mucronate +
0.2 cm2 mm <br />0.002 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
Marilyn M. Park +  and Dennis Festerling Jr. +
Trelease +
cuneate +, truncate +  and cordate +
Heterogamia +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
straight +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
nearly terete;slightly flattened +
globose;cylindric +
Veiny meadow-rue +  and early meadow-rue +
Alta. +, B.C. +, Man. +, N.W.T. +, Ont. +, Que. +, Sask. +, Yukon +, Colo. +, Idaho +, Minn. +, Mont. +, Nebr. +, Nev. +, N.Mex. +, N.Dak. +, Oreg. +, S.Dak. +, Utah +, Wash. +, Wis. +  and Wyo. +
600-3700 m +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
not white +  and colored +
0.3 cm3 mm <br />0.003 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
sessile +  and pedicellate +
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 +
Prairies, riparian woods, and coniferous, deciduous, and mixed forests +
compound +  and simple +
whorled +, opposite +  and alternate +
cauline +  and basal +
3-5-lobed +, obovate +  and orbiculate +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
palmate +  and pinnate +
crenate;entire +
distinct +
conspicuous +
reduced +
Flowering early summer-mid summer (Jun–Aug). +
1 +  and 16 +
Proc. Boston Soc. Nat. Hist. +
not arillate +  and stalked +
greenish white +
not persistent +
distinct +
broadly ovate +  and elliptic or obovate +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
ribbed +  and veined +
20 cm200 mm <br />0.2 m <br /> (50 cm500 mm <br />0.5 m <br />) +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
persistent +
glandular-puberulent;glabrous +
Thalictrum venulosum +
Thalictrum sect. Heterogamia +
species +
not anastomosing-reticulate +
distinct +
herbaceous +  and woody +