Thalictrum polycarpum

(Torrey) S. Watson

Proc. Amer. Acad. Arts 14: 288. 1879.

Common names: Tall western meadow-rue
Illustrated
Basionym: Thalictrum fendleri var. polycarpum Torrey Pacif. Railr. Rep. 4(5): 61. 1857
Treatment appears in FNA Volume 3.

Roots fibrous. Stems erect, 6-18 (-20) dm, glabrous. Leaves mostly cauline, petiolate. Leaf-blade 3-4×-ternately compound; leaflets orbiculate to obovate, apically 3-cleft or 3-parted, divisions undivided or shallowly 3-lobed, 15-40 mm wide, lobes rounded or somewhat acute, surfaces glabrous or glandular. Inflorescences terminal, panicles, many flowered. Flowers: sepals whitish to purplish, elliptic to ovate or lanceolate, 2-4 (-5) mm; filaments whitish to pinkish, 3-6 mm; anthers (1.4-) 2-4 mm, distinctly apiculate. Achenes 10-15, spreading in globose heads, not reflexed, sessile or nearly so; stipe 0-0.6 mm; body nearly globose to obovoid to obliquely obovate, laterally compressed, somewhat inflated and papery, 4-7 (-8) mm, glabrous to glandular, often with 1 or 2 primary-veins on each side, veins sinuous, branched, anastomosing-reticulate; beak 2-4 mm.


Phenology: Flowering mid-late spring (Apr–Jun).
Habitat: Streamsides and other moist places, forests, and open woodlands
Elevation: 600-3100 m

Distribution

V3 372-distribution-map.gif

Calif., Nev., Oreg., Utah, Mexico (Baja California)

Discussion

Thalictrum polycarpum is the only species in sect. Heterogamia with anastomosing-reticulate veins on the achene.

The stems and roots of Thalictrum polycarpum are considered poisonous when ingested by humans or cattle; Native Americans used this species medicinally as a wash for headaches, as an applications for sprains, and as a universal charm and panacea (D. E. Moerman 1986).

Selected References

None.

Lower Taxa

None.

"dm" is not declared as a valid unit of measurement for this property.

... more about "Thalictrum polycarpum"
nearly +  and sessile +
not reflexed +  and spreading +
0.14 cm1.4 mm <br />0.0014 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Marilyn M. Park +  and Dennis Festerling Jr. +
(Torrey) S. Watson +
cuneate +, truncate +  and cordate +
Thalictrum fendleri var. polycarpum +
straight +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
glabrous +  and glandular +
inflated;compressed;nearly globose;obovoid +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
globose;cylindric +
Tall western meadow-rue +
Calif. +, Nev. +, Oreg. +, Utah +  and Mexico (Baja California) +
3-lobed +  and undivided +
15mm +  and 40mm +
600-3100 m +
whitish +  and pinkish +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 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 +
Streamsides and other moist places, forests, and open woodlands +
globose +
whorled +, opposite +  and alternate +
orbiculate +  and obovate apically 3-cleft or 3-parted +
acute;rounded +
palmate +  and pinnate +
crenate;entire +
distinct +
conspicuous +
reduced +
Flowering mid-late spring (Apr–Jun). +
1 +  and 16 +
Proc. Amer. Acad. Arts +
not arillate +  and stalked +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
whitish;purplish +
not persistent +
distinct +
elliptic +  and ovate or lanceolate +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
ribbed +  and veined +
Illustrated +
0 cm0 mm <br />0 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
persistent +
glandular;glabrous +
Thalictrum polycarpum +
Thalictrum sect. Heterogamia +
species +
sinuous +
herbaceous +  and woody +