Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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ASTERACEAE

SUNFLOWER FAMILY

David J. Keil, Family Editor and author, except as specified

Annual to tree
Leaves basal or cauline, alternate to whorled, simple to compound
Inflorescence: 1° inflorescence a head, each resembling a flower, 1–many, generally arrayed in cymes, generally subtended by ± calyx-like involucre; flowers 1–many 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)4–5; stamens 4–5, 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):1–28. See glossary p. 25 for illustrations of general family characteristics.

GUIZOTIA

Annual, perennial herb
Stems erect
Leaves simple; lower opposite; upper sometimes alternate, sessile
Inflorescence: heads radiate, borne in a terminal, leafy-bracted cyme; peduncles slender; involucre bell-shaped; phyllaries few, outer ± leaf-like in texture, inner membranous; receptacle conic, chaffy; chaff scales flat
Ray flowers few; corollas yellow; ligules wide, conspicuously 3-lobed
Disk flowers many; corollas yellow; style tips tapering
Fruit 4-angled, ± flattened, glabrous, shining; pappus 0
Species in genus: 6 species: Africa
Etymology: (Pierre Guizot, 1787–1874; French politician, historian)

Introduced

G. abyssinica (L.f.) Cass.

RAMTILLA


Stems 3–15 dm
Leaves 7–16 cm, linear to lance-ovate, clasping; tip acute to obtuse; margin serrate; surfaces sparsely puberulent to scabrous
Inflorescence: peduncles 3–5 cm; involucre 1–1.5 cm diam; outer phyllaries 5, ± 1 cm, ovate or obovate, obtuse
Ray flowers 8–13; ligule 1.5–2 cm
Disk flowers: corollas 4–5 mm
Fruit ± 4 mm, brown or black
Chromosomes: 2n=30
Ecology: Waste places
Elevation: < 200 m.
Bioregional distribution: San Francisco Bay Area, South Coast
Distribution outside California: native to Africa
Cult as ornamental, oil crop, and birdseed.

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bioregional map for GUIZOTIA%20abyssinica being generated
 
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Retrieve Jepson Interchange Index to Plant Names entry for Guizotia abyssinica
Retrieve dichotomous key for Guizotia
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