Rudbeckia grandiflora

(Sweet) C. C. Gmelin ex de Candolle

in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 556. 1836.

Common names: Largeflower or rough coneflower
Basionym: Centrocarpha grandiflora Sweet Brit. Fl. Gard., ser. 2, 1: plate 87. 1831
Treatment appears in FNA Volume 21. Treatment on page 56. Mentioned on page 53.
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Perennials, to 120 cm (roots fibrous, caudices often woody). Stems proximally glabrous or sparsely hairy (hairs spreading), distally strigose (hairs ascending). Leaves: blades elliptic, lanceolate, or ovate (± conduplicate, not lobed), bases cuneate to rounded, margins entire or remotely serrate, apices acute, faces strigose, abaxially gland-dotted; basal petiolate, 10–35 × 2–11 cm; cauline petiolate (proximal) to nearly sessile (distal), 4–30 × 1.5–9 cm. Heads mostly borne singly. Phyllaries to 15 mm (strigose and gland-dotted). Receptacles hemispheric to ovoid; paleae 5–6.5 mm, (apical margins glabrous) acuminate-cuspidate, awn-tipped, abaxial tips sparsely strigose. Ray florets 12–25; laminae elliptic to obovate (reflexed), 20–50 × 5–10 mm, abaxially hairy and gland-dotted. Discs 10–30 × 15–25 mm. Disc florets 200–800+; corollas greenish yellow basally and in lobes, otherwise maroon, 3.5–5 mm; style branches ca. 1.8 mm, apices obtuse. Cypselae 2–3 mm; pappi coroniform, to 0.5 mm.



Ark., Ga., Ill., Kans., Ky., La., Miss., Mo., Ohio, Okla., Tex., Mostly c, e, and s United States.


Varieties 2 (2 in the flora).

Selected References



1 Stems glabrous or sparsely hairy proximally and hairy distally (hairs ascending, mostly shorter than 0.5 mm) Rudbeckia grandiflora var. alismifolia
1 Stems hairy (hairs spreading proximally, ascending distally, ca. 1 mm) Rudbeckia grandiflora var. grandiflora
... more about "Rudbeckia grandiflora"
Lowell E. Urbatsch +  and Patricia B. Cox +
(Sweet) C. C. Gmelin ex de Candolle +
Centrocarpha grandiflora +
Largeflower or rough coneflower +
Ark. +, Ga. +, Ill. +, Kans. +, Ky. +, La. +, Miss. +, Mo. +, Ohio +, Okla. +, Tex. +, Mostly c +, e +  and and s United States. +
in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. +
Compositae +
Rudbeckia grandiflora +
Rudbeckia sect. Rudbeckia +
species +