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FNA | Family List | FNA Vol. 21 | Asteraceae | Asteraceae tribe Heliantheae | Asteraceae (tribe Heliantheae) subtribe Rudbeckiinae | Rudbeckia sect. Dracopis

1. Rudbeckia amplexicaulis Vahl, Skr. Naturhist. Selsk. 2(2): 29, plate 4. 1793.

Clasping or clasping-leaf coneflower

Dracopis amplexicaulis (Vahl) Cassini

Leaf blades 3–15 × 0.5–4 cm. Involucres 1–4 cm diam. Phyllaries spreading to reflexed, green, linear to lanceolate, herbaceous. Ray laminae spreading, eventually reflexed, elliptic to obovate, 12–30 × 7–15 mm, abaxially hirsute. Disc corollas 2.8–3.5 mm. Cypselae: each face 4–5-striate and minutely cross-rugose, glabrous; pappi 0 (cypselae each with ring of tan tissue at apex, ca. 0.1 mm). 2n = 32.

Flowering late spring–summer. Open sites, moist soils; 0–400 m; Ala., Ark., Fla., Ga., Ill., Kans., La., Miss., Mo., N.Mex., N.Dak., Okla., S.C., Tex.

Rudbeckia amplexicaulis grows mainly in the Gulf coastal plain and Mississippi Embayment. It may be adventive elsewhere. It is used in "native" meadow and roadside plantings and has become a problem in some agricultural crops.


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