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

  • Up-to-date information about California vascular plants is available from the Jepson eFlora.



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.



Elizabeth McClintock

Annual, perennial herb, generally aromatic
Stems erect, generally branched
Leaves alternate, 1–3-pinnately lobed
Inflorescence: heads generally radiate, solitary; phyllaries overlapping in several series, margins scarious; receptacle conic, chaffy; chaff scales narrowly linear
Ray flowers < 25, fertile or sterile; ligules white or yellow
Disk flowers many; corollas yellow; anther tips ovate, bases rounded or ± cordate; style branches truncate with shrub-like tips
Fruit cylindric, ribbed or angled; pappus 0 or a short crown
Species in genus: ± 200 species: Eur, w Asia, n Africa
Etymology: (Greek for chamomile, Anthemis nobilis , see Chamaemelum n.)
Reference: [Ross-Craig 1960–1963 Drawings Brit Plants 16: plates 4,5]


A. arvensis L.


Annual; herbage generally not scented
Stems generally > 20 cm, erect or lowermost decumbent, sometimes rooting at nodes, generally branched from base, ± hairy
Leaves: blades 2–5 cm, 2-pinnately lobed
Inflorescence: heads radiate, 2–3 cm diam, generally solitary; peduncles long; phyllaries > 5 mm, green, margins brown, scarious; receptacle conic, chaffy throughout; chaff persistent, scales lanceolate, tapered upward to a sharp awn, ± same length as disk flowers
Ray flowers 15–20, pistillate; ligules 10–15 mm, white, reflexed
Fruit ± 2 mm, smooth, 5–10-ribbed; pappus a short crown
Chromosomes: 2n=18
Ecology: Uncommon. Escape from cultivated in disturbed areas, roadsides, fields
Elevation: > 1000 m.
Bioregional distribution: Klamath Ranges, Outer North Coast Ranges, c High Sierra Nevada, expected more widely
Distribution outside California: native to Europe

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