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Bailey, L.H. (1949) Manual of Cultivated Plants Revised edition. Macmillan, New York.
Perennial, less often annual or biennial, herbs. Leaves alternate, simple or compound. Capitula radiate, terminal on stems and branches, often showy, long-pedunculate. Disk florets bisexual, brown or purple. Ray florets neuter, with yellow or red ligules. Receptacle strongly hemispherical to elongated, bearing rigid scales. Achenes 4-angled. Pappus crown-like, cup-shaped or 0. Derivation of name: 15 species occurring in N America. Worldwide: Named for Olof O. Rudbeck (1660 - 1740), mentor of Linnaeus. |
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| Species | Content |
| hirta L. | |
| laciniata L. |
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