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.

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 +