Rudbeckia subtomentosa |
|
---|---|
sweet coneflower |
|
Habit | Perennials, to 200 cm (rhizomatous, rhizomes stout). |
Stems | densely hirsute (hairs mostly antrorse, to 0.5 mm). |
Leaves | blades ovate to elliptic (not lobed), margins denticulate to serrate, apices acute to obtuse or acuminate, faces densely hirsute and gland-dotted (glands fewer adaxially); basal 15–30 × 3–10 cm, bases attenuate; cauline petiolate, ovate to elliptic, proximal 3–25 × 1–15 cm, usually 3–5-lobed, bases truncate to cuneate or rounded. |
Receptacles | conic to hemispheric; paleae 4–6 mm, apices acute, abaxial tips hirsute and gland-dotted. |
Ray florets | 10–16; laminae (yellow to yellow-orange) linear to oblanceolate, 20–40 × 5–8 mm, abaxially sparsely hairy, abundantly gland-dotted. |
Disc florets | 200–400+; corollas yellowish green on basal 1/2, otherwise brown-purple, 3–4.2 mm; style branches ca. 1 mm, apices acute. |
Phyllaries | to 1.5 cm (faces hairy and ± gland-dotted). |
Heads | (8–25) in loose, corymbiform to paniculiform arrays. |
Cypselae | 2–3.5 mm; pappi coroniform, to ca. 0.2 mm. |
Discs | 10–17 × 5–15 mm. |
2n | = 38. |
Rudbeckia subtomentosa |
|
Phenology | Flowering late summer–fall. |
Habitat | Mesic to wet prairies, stream banks, and woodland openings |
Elevation | 20–300 m (100–1000 ft) |
Distribution |
AR; CT; IA; IL; IN; KS; KY; LA; MA; MI; MO; MS; NC; NY; OK; TN; TX; WI
|
Discussion | Rudbeckia subtomentosa is often cultivated as an ornamental. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 21, p. 59. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Rudbeckiinae > Rudbeckia > sect. Rudbeckia |
Sibling taxa | |
Name authority | Pursh: Fl. Amer. Sept. 2: 575. (1813) |
Web links |