R. M. King & H. Robinson

Phytologia 19: 297. 1970.

Etymology: For Lloyd Herbert Shinners, 1918–1971, botanist, long at Southern Methodist University, founder of the journal Sida
Treatment appears in FNA Volume 21. Treatment on page 488. Mentioned on page 460.

Perennials, 10–30 cm (aquatic). Stems ascending, unbranched or branched (rooting at proximal nodes). Leaves cauline; opposite; sessile; blades 1- or 3-nerved, broadly oblanceolate or 3-lobed, ultimate margins coarsely toothed, faces sometimes pilose and glabrescent or glabrous, gland-dotted. Heads discoid, borne singly. Involucres hemispheric or broader, 6–9 mm diam. Phyllaries persistent, 25–30 in 2–3+ series, not notably nerved, ovate to lanceolate or linear, ± equal (herbaceous to membranous). Receptacles convex to conic, epaleate (warty). Florets 75–100+; corollas white, throats broadly campanulate (notably wider than tubes, lengths ca. 1 times diams.); styles: bases not enlarged, glabrous, branches linear-filiform. Cypselae prismatic, 4–5-ribbed, sparsely gland-dotted and sparsely hairy (hairs forked); pappi 0. x = 15?


Tex., n Mexico.


Species 1.

Selected References