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Key to families | Table of families and genera

Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.

 

RUDBECKIA CONE-FLOWER

Lowell E. Urbatsch


Annual to perennial herb. Stem: erect, simple or sparingly branched. Leaf: simple, basal and cauline, alternate, petioled or distal sessile; blade entire, toothed or pinnately lobed. Inflorescence: heads radiate or discoid, 1–few, terminal; peduncle long, stout; involucre disk-shaped; phyllaries ± equal or unequal in 1–3 series, spreading or reflexed; receptacle generally columnar to conic or ± spheric, paleate; paleae oblong, entire, folded around fruits, hairy distally. Ray flower: 0 or 7–21, sterile; corolla yellow, ray 2–6 cm. Disk flower: many; corolla green-yellow to dark brown-purple, diam of tube and throat ± equal; anther tip triangular; style tips rounded or blunt-triangular to long-tapered. Fruit: oblong, ± 4-angled; pappus a crown of fused scales or 0.
23 species: North America. (O.J. Rudbeck, 1630–1702, and O.O. Rudbeck, 1660–1740, botany professors at Uppsala, Sweden) [Urbatsch & Cox 2006 FNANM 21:44–60]

Key to Rudbeckia

1. Heads discoid ..... R. occidentalis

1' Heads radiate

2. Stem hairy; pappus 0; disk corollas dark brown-purple; receptacle ± spheric or ovoid ..... R. hirta var. pulcherrima

2' Stem glabrous or nearly so; pappus a crown of fused or ± separate scales; disk corollas green-yellow; receptacle ovoid or conic to columnar

3. Leaves green; abaxial leaf face hairy ..... R. californica

3' Leaves blue-green, glaucous, abaxial leaf face glabrous

4. Leaf margins entire or with a few shallow teeth ..... R. glaucescens

4' Leaf margins generally coarsely toothed or lobed ..... R. klamathensis

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Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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