Thalictrum thalictroides
Thalictrum texanum
anemone meadow-rue, rue-anemone, windflower
Houston meadow-rue
black, tuberous.
becoming black when dry, tuberous, not ribbed, irregular.
erect, scapose, 10-30 cm, glabrous.
erect, 10-45 cm, rigid, glabrous.
blade 2x-ternately compound;
leaflets widely ovate or obovate to nearly rotund, apically 3-lobed, 8-30 mm wide, surfaces glabrous.
blade 2x-ternately compound;
leaflets cuneate to reniform, undivided, cleft, or lobed, 2-7 mm wide, margins entire or sometimes weakly crenate, surfaces glabrous, somewhat glaucous.
umbels or flowers solitary, (1-)3-6-flowered;
involucral bracts usually 3-foliolate, petiolate and opposite, or sessile with leaflets appearing to be whorls of 6 petiolate leaves, otherwise similar to basal leaves.
terminal, racemes, several flowered.
sepals not caducous, white to pinkish, showy, elliptic to obovate, 5-18 mm, longer than stamens;
filaments narrowly clavate, 3-4 mm;
anthers 0.4-0.7 mm.
sepals lanceolate to obovate, in staminate flowers 1.7-3 mm, in pistillate flowers 0.7-1.5 mm;
filaments colored, not white, ca. 1.5 mm;
anthers 1.4-2 mm;
stigma color unknown.
(4-)8-12(-15), short-stipitate;
stipe 0.1-0.4 mm;
body ovoid to fusiform, 3-4.5 mm, prominently 8-10-veined.
few, not reflexed, nearly sessile;
stipe 0.1-0.3 mm;
body ovoid, not laterally compressed, adaxial surface 2.7-3.7 × 1.4-1.6 mm, glabrous, prominently 6-8-veined, veins not anastomosing-reticulate;
beak 0.5-1 mm.
Thalictrum thalictroides
Thalictrum texanum
In Thalictrum, T. thalictroides is unique in having umbelliform inflorescences and is therefore easy to identify. Based on this one distinction, many botanists still place it in the genus Anemonella. The leaflets, flowers, and fruits, however, are not unlike those of Thalictrum.
The Cherokee used infusions prepared from the roots of Thalictrum thalictroides to treat diarrhea and vomiting (D. E. Moerman 1986).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Of conservation concern.
Somewhat difficult to locate in the field, Thalictrum texanum is currently known from only two populations. It is closely related to T. arkansanum and T. debile and sometimes treated as a variety of the latter.
Thalictrum confine is quite similar to T. occidentale and T. venulosum; it has been treated as a variety or synonym of the latter (R. S. Mitchell 1988).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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