Thalictrum debile

Buckley

Amer. J. Sci. Arts 45: 175. 1843.

Conservation concernEndemic
Treatment appears in FNA Volume 3.

Roots brownish, fusiform-tuberous with dried ribs. Stems reclining, branched and flexible proximally, 10-40 cm, glabrous. Leaves: proximal cauline leaves petiolate, 1-3×-ternately compound; distal cauline leaves petiolate or sessile, 1-2×-ternately compound or simple. Leaf-blade: leaflets ovate or obovate to reniform or orbiculate, apically shallowly to deeply 3-7-lobed, rarely undivided, 4-15 mm wide, surfaces glabrous. Inflorescences terminal and axillary, panicles, elongate, few flowered. Flowers: sepals whitish, lanceolate to obovate, 1.5-2.7 mm; filaments colored, not white, 1.5-2 mm; anthers 1.7-2.5 mm, mucronate; stigma color unknown. Achenes 1-6, not reflexed, nearly sessile; stipe 0.1-0.3 mm; body oblong to elliptic-lanceolate, not compressed, 3-3.7 × 0.7-1.2 mm, glabrous, prominently 6-8-veined, veins not anastomosing; beak 1.3-2 mm.


Phenology: Flowering in early spring (Mar–Apr).
Habitat: Rich, rocky, limestone woods, often in wet, alluvial soil
Elevation: 50-300 m

Discussion

Of conservation concern.

Thalictrum debile is closely related to T. arkansanum and T. texanum. The distinctions among the three species should be further studied.

Selected References

None.

Lower Taxa

None.
... more about "Thalictrum debile"
not reflexed +
mucronate +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
Marilyn M. Park +  and Dennis Festerling Jr. +
Buckley +
cuneate +, truncate +  and cordate +
Heterogamia +
straight +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.37 cm3.7 mm <br />0.0037 m <br />) +
not compressed;oblong;elliptic-lanceolate +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
globose;cylindric +
simple +, compound +, sessile +  and petiolate +
Ala. +, Ga. +  and Miss. +
50-300 m +
not white +  and colored +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 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 +
Rich, rocky, limestone woods, often in wet, alluvial soil +
compound +  and simple +
whorled +, opposite +  and alternate +
cauline +  and basal +
3-7-lobed +, obovate +  and reniform or orbiculate +
0.4 cm4 mm <br />0.004 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
palmate +  and pinnate +
crenate;entire +
distinct +
conspicuous +
reduced +
Flowering in early spring (Mar–Apr). +
1 +  and 16 +
compound +  and petiolate +
Amer. J. Sci. Arts +
fusiform-tuberous +
not arillate +  and stalked +
not persistent +
distinct +
lanceolate +  and obovate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.27 cm2.7 mm <br />0.0027 m <br />) +
ribbed +  and veined +
Conservation concern +  and Endemic +
10 cm100 mm <br />0.1 m <br /> (40 cm400 mm <br />0.4 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 +
Thalictrum debile +
Thalictrum sect. Heterogamia +
species +
not anastomosing +
herbaceous +  and woody +