408. Pleurocoronis R. M. King & H. Robinson, Phytologia. 12: 468, fig. pp. 472, 473. 1966.
[Greek pleura, side, and korone, crown, alluding to squamellae that appear to form a crown subtending bristles]
Guy L. Nesom
Subshrubs or shrubs, (10–)30–100 cm. Stems erect, usually much branched. Leaves cauline; mostly opposite (distal often alternate); petiolate; blades 1- or 3-nerved, ovate, deltate, or rhombic to lanceolate, margins entire or toothed [lobed, 2-pinnatifid], faces usually stipitate-glandular. Heads discoid, borne singly or in loose, corymbiform arrays. Involucres ± obconic, 4–6 mm diam. Phyllaries persistent, 30–35 in 3–4+ series, (herbaceous to chartaceous) 1- or 3-nerved, ovate to lanceolate, unequal. Florets 25–30; corollas white, throats narrowly cylindric (lengths 4–6 times diams.); styles: bases not enlarged, glabrous, branches ± clavate. Receptacles flat or convex, epaleate. Cypselae prismatic, 4–5-ribbed, scabrellous; pappi persistent, of 3–6(–12) subulate-aristate scales plus 3–6(–12) coarse, barbellate bristles in 1 series. x = 9.
Species 3 (1 in the flora): w United States, nw Mexico
King, R. M. 1967. Studies in the Eupatorieae, (Compositae). I–III. Rhodora 69: 35–47.