Layia pentachaeta
Layia hieracioides
Sierra layia, Sierra tidy tips
hawkweed layia, tall tidytips
not purple-streaked.
purple-streaked.
blades oblanceolate or lanceolate to linear, 6–110 mm, margins (basal leaves) 1–2-pinnatifid.
blades elliptic, lanceolate, linear, or oblanceolate, 7–150 mm, margins (basal leaves) lobed to toothed.
± hemispheric, 5–12 × 2–12+ mm.
± ellipsoid to obconic, 4–9 × 4–9+ mm.
3–14;
laminae yellow or white, 3–26 mm.
6–16;
laminae yellow, 1–4 mm.
7–120+;
corollas 3–6 mm;
anthers yellow to brownish.
9–80;
corollas 2.5–4.5 mm;
anthers ± dark purple.
4–14, apices shorter or longer than folded bases.
6–16, apices shorter than folded bases.
glabrous.
glabrous.
in 1 series between ray and disc florets.
in 1 series between ray and disc florets.
pappi 0 or of 1–22 whitish, ± equal, setiform scales 1.5–3.5 mm, each proximally plumose, seldom adaxially woolly.
pappi of 10–16 white to rufous or purplish, ± equal bristles or setiform scales 2–4 mm, each proximally plumose, not adaxially woolly.
= 16, 32.
Layia pentachaeta
Layia hieracioides
Subspecies 2 (2 in the flora).
Molecular phylogenetic data have indicated that Layia pentachaeta is closely related to L. glandulosa and L. discoidea (B. G. Baldwin, unpubl.). Distributions of L. pentachaeta and L. glandulosa overlap broadly; the two species occur in different habitats and natural hybridization has been rarely detected (first-generation hybrids are of low to moderate fertility; J. Clausen 1951).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Layia hieracioides occurs in the southern San Francisco Bay area, South Coast Ranges, and Western Transverse Ranges. Diploids and tetraploids are morphologically similar and reportedly geographically distinct, with diploids documented from the San Francisco Bay area and tetraploids (= L. paniculata) documented to the south. Natural, ± sterile hybrids between tetraploid plants and L. glandulosa have been documented from the Central Coast (B. D. Tanowitz and J. W. Adams 1986; R. F. Hoover 8369, UC).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Ray corollas yellow | subsp. pentachaeta |
1. Ray corollas white | subsp. albida |
CA
WildflowerSearch
iNaturalist
USDA Plants Database
