Layia Hook. & Arn.

Last Addition: July 26, 2000.  Each "thumbnail" image below is linked to a larger photograph.

Layia includes 14 annual species ranging from central Washington and Idaho to Baja California and New Mexico.  Plants 2-130 cm high.  Heads radiate (except L. discoidea); phyllaries (0)3-27 each generally folded around a ray ovary; receptacular chaff scales free, marginal or scattered throughout disk; ray florets pistillate, corollas white to yellow, the tubes hairy; disk florets 4-125, perfect, corollas yellow; anthers yellow or dark purple; ray cypselae obcompressed, generally more or less glabrous, epappose; disk cypselae generally club-shaped, more or less hairy, pappus various.  On good years many populations provide a continuous blanket of spring color.  Diploid chromosome numbers include n = 7 (six species) and n = 8 (eight species).  Layia hieracioides includes both diploid (n = 8) and tetraploid (n = 16) populations.

L. carnosa, Humboldt Dunes, near Samoa, CA.
lay_pla_hds.jpg (10483 bytes)
L. chrysanthemoides, Bear Valley, Colusa Co., CA.
L. fremontii, near Merced, CA.
L. gaillardioides, Moraga Hills, CA.
lay_gla_g_hds.jpg (10389 bytes) lay_gla_l_hds.jpg (9341 bytes)
L. glandulosa, white layia.  The yellow-rayed form is sometimes recognized as subsp. lutea.
L. heterotricha, Fresno Co., CA.
L. hieracioides, 1. Santa Lucia Range, southern Monterey Co., CA.  2. Nipomo Mesa, San Luis Obispo Co., CA.
L. pentachaeta, 1, Sierra foothills E of Merced, CA.; 2, Temblor Range, E of Carrizo Plain, CA.; 3, near McKittrick, Kern Co., CA.
L. platyglossa, 1-3, Mt. Diablo, Contra Costa Co., CA.
L. septentrionalis,

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