Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
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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.

ADENOPHYLLUM

Annual, perennial herb, subshrubs
Stems erect
Leaves simple or pinnate, opposite or alternate, dotted with embedded oil glands
Inflorescence: heads radiate or discoid, solitary or in few-headed, often leafy-bracted, often open cymes; peduncles slender, with leaf-like or scale-like bracts; involucre bell-shaped to cylindric; phyllaries in 3 series, outer << others, free, 2 inner ± equal, fused or free, gland-dotted; receptacle flat, bearing short, fringed scales
Ray flowers 0–few; corollas yellow to red
Disk flowers few–many; corollas yellow to orange; style tips tapered
Fruit obconic, ribbed; pappus of scales dissected into slender bristles
Species in genus: 10 species: sw US, n Mex
Etymology: (Greek: gland-leaf)
Reference: [Strother 1986 Sida 11:371–378]

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