Jepson Flora Project: Jepson Interchange    

 
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©Copyright 1993 by the Regents of the University of California

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

MACHAERANTHERA

David J. Keil and Gregory K. Brown

Annual to subshrubs
Stems from taproot or ± branched caudex
Leaves simple, alternate, entire to pinnately dissected; teeth or lobes often ± bristle-tipped
Inflorescence: heads radiate or discoid, solitary or cymosely clustered; involucre bell-shaped, hemispheric, or obconic; phyllaries in 2–several series of unequal length, basal portion straw-colored to purplish, tips green; receptacle convex, naked or with short, triangular scales (not chaff)
Ray flowers 8–many; corollas yellow, white, pink, blue, or purple
Disk flowers 10–many; corollas yellow; style tips triangular to linear, acute
Fruit linear to club-shaped or obovoid, smooth or several–many-ribbed, glabrous to densely hairy; pappus of many unequal bristles (ray pappus sometimes 0)
Species in genus: ± 35 species: temp w North America
Etymology: (Greek: sword-like anthers)
Reference: [Hartman 1990 Phytologia 68:439–465]

Native

M. carnosa (A. Gray) G.L. Nesom

SHRUBBY ALKALI ASTER

Subshrub 5–9 dm, much-branched, ± glabrous, glaucous
Leaves: lower 1–2 cm, linear, entire, fleshy; upper reduced to appressed, awl-shaped scales 1–4 mm
Inflorescence: heads discoid, solitary at branch tips; involucre 5.5–7 mm; phyllaries generally in 4–5 series, with tips acute or acuminate, appressed or outer spreading
Ray flowers 0
Disk flowers 12–18; corollas ± 6 mm
Fruit 2–3 mm, subcylindric, many-ribbed, appressed-hairy; pappus ± 6 mm
Ecology: Alkaline soils
Elevation: 100–1600 m.
Bioregional distribution: San Joaquin Valley, East of Sierra Nevada, Mojave Desert
Distribution outside California: s Nevada, w&s Arizona
Flowering time: Jun–Oct
Synonyms: Aster intricatus (A. Gray) S.F. Blake

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bioregional map for MACHAERANTHERA%20carnosa being generated
 


Retrieve Jepson Interchange Index to Plant Names entry for Machaeranthera carnosa
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