Anulocaulis eriosolenus
Contr. U.S. Natl. Herb. 12: 375. 1909.
Herbs, stout or slender, short-lived perennial or annual. Stems 0.2–1.8 m. Leaves: 2–3 pairs near base; petiole 2–7 cm; blade broadly ovate to almost round, 2–11 × 2–13 cm, base shallowly cordate to ± truncate, apex rounded or obtuse, adaxial surface yellow-green, abaxial surface much paler, both surfaces sparsely villous-hispid with blackish based hairs. Flowers usually borne singly on branchlets of inflorescence; perianth 8–9 mm, tube white to pink or pale lavender [magenta], finely pubescent, limbs white to pink or pale lavender [magenta], gradually flared from tube; stamens 5, exserted 4–6 mm. Fruits bluntly 5-angled, turbinate, 2.6–3.8 × 2.4–3.4 mm, sometimes secreting mucilage (especially southern populations) when wetted; ribs 10, faint, linear; equatorial flange or ridge absent. 2n = 24.
Phenology: Flowering late spring-mid fall.
Habitat: Sandy, gravelly limestone outwash fans, or calcareous silty soils, gypsum
Elevation: 600-1200 m
Distribution
Tex., Mexico (Chihuahua), Mexico (Coahuila)
Discussion
The perianth tube of Anulocaulis eriosolenus elongates two to seven times its length after the limb of the perianth wilts.
Selected References
None.
Lower Taxa
"thick" is not a number.