Thalictrum coriaceum

(Britton) Small

Mem. Torrey Bot. Club 4: 98. 1893.

Endemic
Basionym: Thalictrum dioicum var. coriaceum Britton Bull. Torrey Bot. Club 18: 363. 1891
Synonyms: Thalictrum caulophylloides Small Thalictrum steeleanum B. Boivin
Treatment appears in FNA Volume 3.

Roots bright-yellow, tuberous. Stems erect, coarse, 65-150 cm, glabrous. Leaves cauline; petioles of proximal leaves well developed, clasping stem, distal leaves sessile or nearly so. Leaf-blade 1-4×-ternately compound; leaflets reniform or obovate to orbiculate, apically 3-9-lobed or toothed, 10-75 mm wide, lobe margins crenate, surfaces abaxially glabrous or glandular. Inflorescences panicles, pyramidal, loosely branched, many flowered. Flowers: sepals white to purplish, lanceolate-ovate, 1.5-5.5 mm; filaments maroon, 4-4.5 mm; anthers 2-5.5 mm, apiculate, subulate-tipped; stigma maroon. Achenes 3-15, erect, not reflexed, stipitate; stipe ± wing-angled, 0.7-2.5 mm; body obliquely ovoid to ellipsoid, not laterally compressed, 3-6.5 mm, strongly veined or ribbed, veins not anastomosing; beak 1.5-3 mm.


Phenology: Flowering mid spring–late spring (late May–Jun).
Habitat: Rocky or mesic, open, deciduous woods, thickets, and moist alluvium, chiefly in mountains and piedmont
Elevation: 3-1100 m

Distribution

V3 77-distribution-map.gif

D.C., Ky., Md., N.C., Pa., Tenn., Va., W.Va.

Discussion

Glandular plants of Thalictrum coriaceum have often been misidentified as T. revolutum despite important differences in the leaflets, the latter having entire rather than crenate lobe margins.

Studies by M. Park and L. Morse (unpubl.) for The Nature Conservancy confirmed that Thalictrum steeleanum is highly variable in all allegedly diagnostic characters and is not distinct from T. coriaceum.

Selected References

None.

Lower Taxa

None.
... more about "Thalictrum coriaceum"
not reflexed +  and erect +
subulate-tipped +
0.2 cm2 mm <br />0.002 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
Marilyn M. Park +  and Dennis Festerling Jr. +
(Britton) Small +
cuneate +, truncate +  and cordate +
Thalictrum dioicum var. coriaceum +
straight +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
ribbed +  and veined +
compressed;obliquely ovoid;ellipsoid +
0.3 cm3 mm <br />0.003 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
globose;cylindric +
nearly +  and sessile +
D.C. +, Ky. +, Md. +, N.C. +, Pa. +, Tenn. +, Va. +  and W.Va. +
3-1100 m +
0.4 cm4 mm <br />0.004 m <br /> (0.45 cm4.5 mm <br />0.0045 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 +
Rocky or mesic, open, deciduous woods, thickets, and moist alluvium, chiefly in mountains and piedmont +
flowered +  and branched +
compound +  and simple +
whorled +, opposite +  and alternate +
obovate +  and orbiculate apically 3-9-lobed or toothed +
1 cm10 mm <br />0.01 m <br /> (7.5 cm75 mm <br />0.075 m <br />) +
palmate +  and pinnate +
crenate;entire +
(1-)2-200-flowered +
distinct +
conspicuous +
reduced +
Flowering mid spring–late spring (late May–Jun). +
1 +  and 16 +
Mem. Torrey Bot. Club +
bright-yellow +
not arillate +  and stalked +
white;purplish +
not persistent +
distinct +
lanceolate-ovate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
ribbed +  and veined +
65 cm650 mm <br />0.65 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
persistent +
glandular;glabrous +
Thalictrum caulophylloides +  and Thalictrum steeleanum +
Thalictrum coriaceum +
Thalictrum sect. Heterogamia +
species +
not anastomosing +
herbaceous +  and woody +