Melanthera angustifolia A. Rich.
Family: Asteraceae
Everglades Squarestem
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Plants 30-90 cm. Stems weakly erect, strigose. Leaf blades usually linear to narrowly oblanceolate, rarely narrowly ovate-elliptic, 3-8 × 0.5-1.5 cm, bases cuneate, margins irregularly serrate, faces sparsely strigose. Heads borne singly. Peduncles 9-20 cm, glabrescent. Involucres 6-12 mm diam. Phyllaries ovate, 4-5 × 2-3 mm. Paleae 4-5 × 1 mm, apical mucros 0.5-1 mm, straight to slightly recurved. Florets 30-40; corollas 5.5 mm; anther sacs 2 mm. Cypselae 2.5 × 1.5 mm. 2n = 30.

Flowering Jan-Mar (perhaps year-round). Moist to dry, lightly shaded pine flatwoods; 0-10+ m; Fla.; Mexico (Yucatan); West Indies (Cuba); Central America.