Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora.

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.

MICROSERIS

Kenton L. Chambers

Annual or perennial herb, ± mealy (hairs drying as minute white scales); sap milky
Leaves mostly basal, generally linear to (ob)lanceolate, generally variably entire to pinnately lobed
Inflorescence: heads solitary, ligulate, ± nodding in bud; involucre generally fusiform to spheric; phyllaries in 2–several series, outer overlapping, inner often ± black-hairy; receptacle naked
Flowers 5–many; corollas white to orange, often reddish below, ligules = to >> involucre, readily withering
Fruit cylindric to fusiform, generally square-topped, not beaked; ribs ± 10, ± scabrous; pappus of generally 5–many ± lanceolate, bristle-tipped scales
Etymology: (Greek: small chicory)
Reference: [Chambers Contr Dudley Herb Stanford U: 1955 4:207–312 & 1957 5:57–68]
Hybridization common. Self-pollinating (annual) or self-incompatible and ± complex (perennial herb).

Native

M. borealis (Bong.) Sch.Bip.

NORTHERN MICROSERIS

Perennial 15–60 cm; caudex rhizome-like; roots several, fleshy
Leaves basal, 6–30 cm, entire to few-toothed
Inflorescence: involucre 10–18 mm; outer phyllaries narrow, << inner
Flowers 20–50; ligules yellow
Fruit: body 4–8 mm, brown; ribs smooth; tip not flared; pappus scales 0; bristles 30–60, 5–10 mm, brown, barbed
Chromosomes: 2n=18
Ecology: Wet meadows, sphagnum bogs
Elevation: 1000–2000 m.
Bioregional distribution: Outer North Coast Ranges (Bald Mtn, Humboldt Co.)
Distribution outside California: to Alaska
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for MICROSERIS%20borealis being generated
 
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Retrieve Jepson Interchange Index to Plant Names entry for Microseris borealis
Retrieve dichotomous key for Microseris
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Overlay Consortium of California Herbaria specimen data by county on this map
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