Cnidoscolus texanus

(Müller Arg.) Small
Fl. S.E. U.S., 706. 1903.
Common names: Texas bull-nettle
Weedy
Basionym: Jatropha texana Müller Arg. Linnaea 34: 211. 1865
Treatment appears in FNA Volume 12. Treatment on page 198. Mentioned on page 197.

Plants (30–)40–50(–100) cm. Leaves: stipules 3–4 mm, margins usually deeply toothed, rarely entire; petiole 5–18 cm; blade ± round in outline, 6–15 cm diam., deeply lobed, lobes 3/5–4/5 blade length, base broadly cordate, margins dentate, teeth and lobe apices acute, not aristate. Staminate flowers: calyx funnel-shaped, tube 12–17 mm, distally flaring, stinging hairs present, lobes 10–17 mm; stamens of outer whorl shorter than inner, filaments of outer whorl distinct or connate basally, of inner whorl connate most of length; staminodes 0. Pistillate flowers: sepals 15–25 mm; stigmas 12–24. Capsules 15–20 mm. Seeds brown, sometimes mottled, 14–18 mm. 2n = 36.


Phenology: Flowering mainly Apr–Jul(–Nov).
Habitat: Sandy open woods, fields, disturbed areas.
Elevation: 0–900 m.

Distribution

V12 594-distribution-map.jpg

Ark., La., Okla., Tex., Mexico (Tamaulipas).

Discussion

Both Cnidoscolus texanus and C. stimulosus are found in Louisiana, but their distributions are separated by about 250 km, with C. texanus found in the western half of the state and C. stimulosus restricted to St. Tammany and Washington parishes in the east.

Selected References

None.

Lower Taxa

None.