Overview

Distribution

National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

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Tex.
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Physical Description

Morphology

Description

Roots becoming black when dry, tuberous, not ribbed, irregular. Stems erect, 10-45 cm, rigid, glabrous. Leaves: distal cauline long-petiolate. Leaf blade 2×-ternately compound; leaflets cuneate to reniform, undivided, cleft, or lobed, 2-7 mm wide, margins entire or sometimes weakly crenate, surfaces glabrous, somewhat glaucous. Inflorescences terminal, racemes, several flowered. Flowers: 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. Achenes 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.
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Diagnostic Description

Synonym

Thalictrum debile Buckley var. texanum A. Gray in A. Gray et al., Syn. Fl. N. Amer. 1: 18. 1895
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Type Information

Isotype for Thalictrum debile var. texanum A. Gray in B.L. Rob.
Catalog Number: US 344
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Preparation: Pressed specimen
Collector(s): E. Hall
Year Collected: 1872
Locality: Near Houston., Harris, Texas, United States, North America
  • Isotype: Robinson, B. L. 1895. Syn. Fl. N. Amer. 1(1): 18.
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Ecology

Habitat

Comments: Margins of moist woodlands or forests on alluvial terraces. Also, rarely, in moist ditches on partially shaded roadsides.

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Margins or openings of mesic woodlands or forests; of conservation concern; 10-100m.
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Life History and Behavior

Cyclicity

Flowering/Fruiting

Flowering early spring (Mar-Apr).
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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: N2 - Imperiled

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NatureServe Conservation Status

Rounded Global Status Rank: G2 - Imperiled

Reasons: A Texas endemic with a limited range in areas of rapidly expanding urbanization.

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Notes

Comments

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).

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