Turner's Horseweed

Annuals, 15–20 cm (sometimes branched from bases). Leaf blades: bases (all or distal) ± clasp-ing, faces sparsely villous (hairs erect, multicellular) and stipitate- and sessile-glandular; proximal obovate to oblanceolate, 20–50+ × 5–12+ mm, mostly 1–2-pin-nately lobed (lobes ovate); distal similar, smaller, pinnately lobed or entire. Heads in ± corymbiform arrays. Involucres 3–4 mm. Recep-tacles 3.5–4 mm diam. Pistillate florets ca. 200; corollas: lengths ± ¹ / 2 styles, laminae 0. Disc florets 15–18. Cypselae tan, 0.8–1 mm, strigillose (hairs 0.7–0.1 mm) and with sessile glands near apices; pappi fragile or readily falling, of 16–18 white bristles in 1 series, 2 mm.