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|Jepson eFlora: Taxon page
Key to families | Table of families and genera
Index to accepted names and synonyms:
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|Family: Asteraceae (Compositae)||View Description||Dichotomous Key|
|Genus:||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Habit: Annual [perennial herb] 1--12 dm. Stem: prostrate to +- erect. Leaf: simple, basal and cauline, opposite proximally, often withered before flower, most alternate, +- sessile, oblanceolate to linear or lance-linear, proximal generally 1--2 pinnately lobed, lobes toothed or entire, sometimes bristly-ciliate, distal entire, generally spine-tipped, faces glabrous or scabrous and/or coarse- to soft-hairy or puberulent, often also glandular. Inflorescence: heads radiate, congested or in spike- to panicle- or umbel-like clusters; peduncle bracts generally spine-tipped; involucre +- obconic or urn-shaped, 3--8+ mm diam; phyllaries 5--75+, lanceolate or oblanceolate, each +- 1/2-enclosing ray ovary, falling with fruit or both persistent and head or flower branch dispersing as unit, scabrous and/or coarse- to soft-hairy or puberulent, often also glandular; receptacle flat to convex, minutely bristly; paleae subtending all or most disk flowers, free. Ray Flower: 5--75+; corolla yellow, ray 2--6 mm. Disk Flower: ; Fruit: ray fruit 2--3 mm, +- compressed, bulging abaxially, glabrous, beaked or elevated adaxially; pappus 0; disk pappus 0 or of 3--12 linear, awl-shaped or oblanceolate scales.
Species In Genus: 4 species: California, southern Oregon, northern Baja California (alien elsewhere in western United States, New York). Etymology: (Latin: prickly Madia) Note: Self-sterile.
eFlora Treatment Author: Bruce G. Baldwin
Jepson Online Interchange
Key to CentromadiaPrevious taxon: Centaurea virgata subsp. squarrosa
Next taxon: Centromadia fitchii
Citation for this treatment: Bruce G. Baldwin 2016. Centromadia, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=77573, accessed on October 23, 2016.
Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on October 23, 2016.