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Jepson Interchange (more information)
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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.

PERITYLE

Annual, perennial herb, subshrubs, shrubs
Leaves opposite or alternate, simple to deeply divided or compound, sessile or petioled
Inflorescence: heads radiate, discoid or disciform, solitary or in cymes; peduncles short or long; involucre cylindric, hemispheric, or bell-shaped; phyllaries in 2–3 ± equal series, linear to ovate; receptacle flat to conic, naked
Ray flowers: ligules yellow or white
Disk flowers many; corollas yellow or white, 4-lobed; anther tips triangular; style tips tapered
Fruit linear to oblanceolate, very flat, sometimes weakly 3–4-angled; surface dark brown or black, glabrous or puberulent; margins generally ± thick, puberulent to strongly ciliate; pappus 0 or a crown of fringed scales and 0–2 slender bristles
Species in genus: ± 75 species: sw North America
Etymology: (Greek: around the margin, from thick fruit margin)
Reference: [Powell 1974 Rhodora 76:229–306]
Horticultural information: STBL.

Native

P. megalocephala (S. Watson) J.F. Macbr.

Subshrub 15–55 cm, short-rough-hairy
Stems many, much-branched
Leaves generally alternate; petiole 1–6 mm; blade 7–15 mm, 1–10 mm wide, linear to widely ovate, tip acute to obtuse, margin generally entire, rarely serrate or lobed
Inflorescence: heads discoid, 1–few, loosely clustered; peduncles generally 1–5 cm, bracts leaf-like; involucre 3.5–7.5 mm diam, bell-shaped; phyllaries 14–19, 5–6 mm, lanceolate or oblong
Ray flowers 0
Disk flowers: corollas 3.5–4.2 mm
Fruit 2.5–3 mm; 1 or both surfaces rounded or ± angled, puberulent; margin hairy; pappus 0 or a crown of vestigial scales, rarely with 1 bristle
Ecology: Rocky places
Elevation: 1300–2800 m.
Bioregional distribution: White and Inyo Mountains, Desert Mountains
Distribution outside California: Nevada

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