|Jepson Flora Project: Jepson Interchange|
|TREATMENT FROM THE JEPSON MANUAL (1993)||
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
AND IS MAINTAINED FOR ARCHIVAL PURPOSES ONLY
Annual to tree
Leaves basal or cauline, alternate to whorled, simple to compound
Inflorescence: 1° inflorescence a head, each resembling a flower, 1many, generally arrayed in cymes, generally subtended by ± calyx-like involucre; flowers 1many per head
Flowers bisexual, unisexual, or sterile, ± small, of several types; calyx 0 or modified into pappus of bristles, scales, or awns, which is generally persistent in fruit; corolla radial or bilateral (rarely 0), lobes generally (0)45; stamens 45, anthers generally fused into cylinder around style, often appendaged at tips, bases, or both, filaments generally free, generally attached to corolla near throat; pistil 1, ovary inferior, 1-chambered, 1-seeded, style 1, branches 2, generally hair-tufted at tip, stigmas 2, generally on inside of style branches
Fruit: achene, cylindric to ovoid, generally deciduous with pappus attached
Genera in family: ± 1300 genera, 21,000 species (largest family of dicots): worldwide. Largest family in CA. Also see tribal key to CA genera: Strother 1997 Madroño 44(1):128. See glossary p. 25 for illustrations of general family characteristics.
Annual, biennial, perennial herb
Stems erect, simple or branched
Leaves simple, basal and alternate, petioled or upper sessile; blades entire, toothed or pinnately lobed
Inflorescence: heads radiate or discoid, 1few, terminal; peduncles long, stout; involucre disk-shaped; phyllaries in 13 equal or unequal series, spreading or reflexed; receptacle conic to columnar, chaffy; chaff scales oblong, entire folded around fruits
Ray flowers 0 or many, sterile
Disk flowers many; corolla yellow to dark brown, diam of tube and throat ± equal; style tips blunt-triangular
Fruit oblong, 4-angled, ± flattened; pappus a crown of fused scales or 0
Species in genus: ± 15 species: North America
Etymology: (O.J. Rudbeck, 16301702, and O.O. Rudbeck, 16601740, professors of botany at Uppsala, Sweden)
Perennial; rhizome stout
Stems 618 dm, erect, generally unbranched, glabrous
Leaves: blade generally 1030 cm, lanceolate to ovate or elliptic, entire, toothed or coarsely lobed
Inflorescence: head, radiate, solitary; peduncles 26 dm; outer phyllaries 12 cm, linear-oblong, > inner; disk 1.56 cm, ovoid to columnar; chaff greenish
Ray flowers 821; ligules yellow, 26 cm, often reflexed
Disk flowers: corollas 45 mm, greenish yellow
Fruit 45 mm, glabrous; pappus scales 11.5 mm
Ecology: Meadows, seeps, mires
Elevation: < 2600 m.
Bioregional distribution: Klamath Ranges, North Coast, High Sierra Nevada
Distribution outside California: s Oregon
Leaf generally 36 cm wide, entire or shallowly few-toothed; both surfaces glabrous
Ecology: Meadows, seeps, mires, stream-banks, often on serpentine
Elevation: 601250 m.
Bioregional distribution: n North Coast, w Klamath Ranges
Distribution outside California: sw Oregon
Recent taxonomic note: Rudbeckia glaucescens Eastw.
Horticultural information: WET or IRR, SUN: 5, 6, 7, 8, 9, 10, 14, 15, 16, 17, 18, 19.