Sida filipes A. Gray, Boston J. Nat. Hist. 6: 164. 1850

Plants 1–1.5 m. Stems distichously branched, stellate-hairy, hairs ferruginous, 1 mm diam. Leaves: stipules equaling or exceeding petioles; petiole 1–3(–5) mm; blade discolorous, 2–5(–8) cm, apex acute, surfaces densely stellate-hairy abaxially, sparsely hairy adaxially, hairs simple. Pedicels capillary, often equaling or exceeding subtending leaves. Flowers: buds nodding; calyx 3–4 mm, rounded basally, surfaces ferruginous stellate-hairy; petals 4–6 mm, glabrous throughout (including claw); staminal column purplish, 2–2.5 mm, apically antheriferous; anthers yellowish; styles purple, glabrous. Schizocarps 5 mm diam.; mericarps 2.5 mm. Seeds 1.7 mm, subglabrous. 2n = 16.

Flowering spring–summer. Arid shrublands; 50–500 m; Tex.; Mexico (Coahuila, Nuevo León, San Luis Potosí, Tamaulipas).

Meximalva filipes is very reminiscent of the widespread Sidastrum paniculatum, differing from that primarily by its solitary, axillary flowers each subtended by a reduced leaf and its non-reflexed petals. In the flora area, it is known from scattered areas of central, southern, and southwestern Texas.