Southwestern Ringstem

Anulocaulis leiosolenus (Torr.) Standley, Contr. U. S. Nat. Herb
12: 375. 1909.
Boerhaavia leiosolena Torr. Bot. Mex. Bound. Surv. 172. 1859. Acleisanthes nummularia M. E. Jones, Contr. West. Bot. 10: 43. 1902. Boerhaavia nummularia M. K. Jones; Prain, Ind. Kew. Suppl. 4: 27. 1913.
Plants erect, 6-10 dm. high, sparsely branched below, the branches stout, glaucous, glabrous; leaves 1 or 2 pairs at the base of the stem, the petioles stout, 2-11 cm. long, the blades reniform to broadly oval, rhombic-orbicular, or ovate-oval, 3.5-15 cm. long, 3.5-12.5 cm, wide, deeply cordate to truncate at the base, broadly rounded at the apex, rather coarsely sinuate, thick-coriaceous, yellowish-green on the upper surface and when young tomentulose, beneath glaucescent and tomentulose or villous when young but early glabrate and gland-dotted; inflorescence much branched, the branches stout, naked, the flowers fasciculate or in dense spikes, short-pedicellate; bracts minute, ovate, coriaceous, glabrous; perianth yellowishgreen, 2.5-3 cm. long, glabrous, gradually dilated above into a narrow limb; stamens 5, short-exserted, fruit biturbinate, 5-6 mm. long, glaucous, in age developing at the middle a rigid horizontal wing 6-7 mm. in diameter; seed biturbinate, 3 mm. long, pale-brown.
Type locality: In gypseous soil, Great Canyon of the Rio Grande, 70 miles below Kl Paso,
Texas.
Distribution: In strongly alkaline soil, western Texas to Arizona and Nevada.

Anulocaulis leiosolenus (Torr.) Standley, Contr. U. S. Nat. Herb
12: 375. 1909.
Boerhaavia leiosolena Torr. Bot. Mex. Bound. Surv. 172. 1859. Acleisanthes nummularia M. EJones, Contr. West. Bot. 10: 43. 1902. Boerhaavia nummularia M, E. Jones; Prain, Ind. Kew. Suppl. 4: 27. 1913.
Plants erect, 6-10 dm. high, sparsely branched below, the branches stout, glaucous, glabrous; leaves 1 or 2 pairs at the base of the stem, the petioles stout, 2-11 cm. long, the blades reniform to broadly oval, rhombic-orbicular, or ovate-oval, 3.5-15 cm. long, 3.5-12.5 cm. wide, deeply cordate to truncate at the base, broadly rounded at the apex, rather coarsely sinuate, thick-coriaceous, yellowish-green on the upper surface and when young tomentulose, beneath glaucescent and tomentulose or villous when young but early glabrate and gland-dotted; inflorescence much branched, the branches stout, naked, the flowers fasciculate or in dense spikes, short-pedicellate; bracts minute, ovate, coriaceous, glabrous; perianth yellowish-green, 2.5-3 cm. long, glabrous, gradually dilated above into a narrow limb; stamens 5, short-exserted . fruit biturbinate, 5-6 mm. long, glaucous, in age developing at the middle a rigid horizontal wing 6-7 mm. in diameter; seed biturbinate, 3 mm. long, pale-brown.
Type Texas.