Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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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.


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]


L. glandulosa (Hook.) Hook. & Arn.


Plant 4–60 cm, glandular, sometimes spicy-scented
Leaves < 10 cm, linear to obovate, thin, generally ± irregularly lobed below
Inflorescence: peduncles 0–7 cm; phyllaries 4–11 mm, basal margins interlocked by cobwebby hairs; chaff scales between ray and disk flowers
Ray flowers 3–14; ligules 3–22 mm, white to yellow
Disk flowers 17–105; corollas 3.5–6.5 mm; anthers yellow
Fruit generally ± hairy; disk pappus of 10–15 awns, 2–5 mm, linear, flat, white, plumose below, often woolly on inner surface, scabrous above
Chromosomes: 2n=16
Ecology: Open, sandy soils,
Elevation: < 2700 m.
Bioregional distribution: High Cascade Range, High Sierra Nevada, s Sierra Nevada Foothills (rare), Tehachapi Mountain Area, San Joaquin Valley, Central Western California, Southwestern California (except Channel Islands), Great Basin Floristic Province, Desert
Distribution outside California: to Washington, Idaho, Utah, New Mexico
Flowering time: Mar–Jun
Synonyms: subsp. lutea D.D. Keck
Horticultural information: DRN, SUN: 1, 2, 3, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24.

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bioregional map for LAYIA%20glandulosa being generated
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Layia glandulosa
Retrieve dichotomous key for Layia
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Overlay Consortium of California Herbaria specimen data by county on this map
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