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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.

LAYIA

Bruce G. Baldwin and Susan J. Bainbridge

Annual, generally ascending to erect, often black-glandular, generally ± purplish or brownish
Leaves alternate, generally linear to (ob)lanceolate, sessile, generally pinnately lobed, reduced upward
Inflorescence: heads generally radiate; involucre obconic to urn-shaped; phyllaries generally folded completely around ray fruit, falling with fruit, generally ± hairy; receptacle flat to slightly convex, chaff scales free, in ring between ray and disk flowers or throughout
Ray flowers (0)3–27; ligules white (often aging pinkish) to yellow, tubes hairy
Disk flowers 5–many; corollas yellow, puberulent; anther tips acute, long-tapered; style branches long, bristly
Fruit generally 2–5 mm, generally club-shaped, black; ray fruit compressed back to front, generally ± glabrous, pappus 0; disk fruit ± straight, generally ± hairy, pappus various
Species in genus: 14 species: w North America
Etymology: (George T. Lay, early 19th century English plant collector)
Reference: [Kyhos et al. 1990 Ann Missouri Bot Gard 77:84–95]

Native

L. septentrionalis D.D. Keck

COLUSA LAYIA

Plant 6–35 cm, glandular, not scented
Leaves 4–70 mm, linear to (ob)lanceolate, thin; lower leaves generally lobed > 1/2 to midvein
Inflorescence: peduncles < 8 cm; involucre ± narrow elliptic to bell-shaped; phyllaries 5–12 mm, basal margins interlocked by cottony hairs; chaff scales between ray and disk flowers
Ray flowers 5–9; ligules 4–15 mm, yellow
Disk flowers 10–67; corollas 5–8 mm; anthers yellow
Fruit 3.5–7.5 mm; disk pappus of 16–22 bristles, 4–7 mm, white, densely plumose below, scabrous above, densely woolly on inner surface
Chromosomes: 2n=16
Ecology: UNCOMMON. Serpentine or sandy soils
Elevation: 100–800 m.
Bioregional distribution: c&s Inner North Coast Ranges, Sacramento Valley (Sutter Buttes)
Horticultural information: SUN: 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24.
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for LAYIA%20septentrionalis being generated
 


Retrieve Jepson Interchange Index to Plant Names entry for Layia septentrionalis
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