Ratibida pinnata

(Ventenat) Barnhart
Bull. Torrey Bot. Club 24: 410. 1897.
Common names: Grayhead or pinnate prairie coneflower
IllustratedEndemic
Basionym: Rudbeckia pinnata Ventenat Descr. Pl. Nouv., plate 71. 1802
Treatment appears in FNA Volume 21. Treatment on page 62. Mentioned on page 61.

Perennials, to 125+ cm; fibrous rooted (arising from stout rhizomes or woody caudices). Leaves 5–40 × 3–15+ cm, pinnatifid to pinnate, lobes 3–9, narrowly lanceolate to ovate, 1–15 × 0.2–3.5 cm, faces strigose, gland-dotted. Heads mostly 1–12, held well beyond leaves. Peduncles 3–27+ cm (ribs tan, prominent). Phyllaries 10–15, outer linear, 3–15 × 1–3 mm, inner lanceolate-ovate, 3–6 × 0.7–3 mm. Paleae 1.2–5 × 1–1.8 mm, resin glands linear to oblanceolate, 2–3.3 mm. Ray florets 6–15; corollas yellow, 2.5–3.8 mm, tubes ca. 1–3 mm, hirsute, laminae linear-elliptic to oblong-oblanceolate, 16–60 × 4–15 mm. Discs ellipsoid to globular or ovoid, 10–25 × 10–18 mm. Disc florets 100–200+; corollas greenish yellow, often purplish distally, 2.5–3.8 mm; style branches ca. 1.8 mm, proximal 1/2 stigmatic, apices subulate. Cypselae linear-oblanceoloid, 2–4 × 1–2.3 mm, margins usually glabrous, sometimes adaxial ciliate; pappi 0 or of 1–2 toothlike projections. 2n = 28.


Phenology: Flowering May–Oct.
Habitat: Prairies, woodland openings and borders, limestone outcrops
Elevation: 10–300 m

Distribution

V21-139-distribution-map.gif

Ont., Ala., Ark., Fla., Ga., Ill., Ind., Iowa, Kans., Ky., La., Mass., Mich., Minn., Miss., Mo., Nebr., N.Y., Ohio, Okla., S.Dak., Tenn., Vt., Wis.

Discussion

Selected References

None.

Lower Taxa

None.

... more about "Ratibida pinnata"
Lowell E. Urbatsch +  and Patricia B. Cox +
(Ventenat) Barnhart +
Rudbeckia pinnata +
Grayhead or pinnate prairie coneflower +
Ont. +, Ala. +, Ark. +, Fla. +, Ga. +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Mass. +, Mich. +, Minn. +, Miss. +, Mo. +, Nebr. +, N.Y. +, Ohio +, Okla. +, S.Dak. +, Tenn. +, Vt. +  and Wis. +
10–300 m +
Prairies, woodland openings and borders, limestone outcrops +
Flowering May–Oct. +
Bull. Torrey Bot. Club +
Illustrated +  and Endemic +
Compositae +
Ratibida pinnata +
Ratibida +
species +