R. M. King & H. Robinson

Phytologia 22: 154. 1971.

Etymology: Alluding to the Tamaulipan Desert region, to which the species is restricted
Treatment appears in FNA Volume 21. Treatment on page 480. Mentioned on page 461, 462.

Shrubs, (100–)200–300 cm (sometimes subscandent, climbing and sprawling over other plants). Stems erect or clambering, intricately branched (often brittle, glabrous or nearly so, not viscid). Leaves cauline; opposite; petiolate; blades usually 3-nerved from bases, deltate, margins toothed, faces puberulent to velutinous (not gland-dotted). Heads discoid, in corymbiform arrays. Involucres obconic to hemispheric, 5–7 mm diam. Phyllaries persistent, 30–35 in 2–3+ series, obscurely nerved, lanceolate to subulate, unequal (herbaceous to chartaceous or membranous). Receptacles convex to conic, epaleate. Florets 30–50+; corollas usually blue to lavender, sometimes white, throats narrowly funnelform (lengths 1.5–2 times diams.); styles: bases not enlarged, glabrous, branches linear-filiform. Cypselae prismatic, 5–6-ribbed, sparsely scabrellous; pappi persistent, of ca. 35 barbellate bristles in 1 series. x = 10.


Tex., ne Mexico.


Species 1.

Selected References


Lower Taxa