Layia hieracioides
Layia pentachaeta
hawkweed layia, tall tidytips
Sierra layia, Sierra tidy tips
purple-streaked.
not purple-streaked.
blades elliptic, lanceolate, linear, or oblanceolate, 7–150 mm, margins (basal leaves) lobed to toothed.
blades oblanceolate or lanceolate to linear, 6–110 mm, margins (basal leaves) 1–2-pinnatifid.
± ellipsoid to obconic, 4–9 × 4–9+ mm.
± hemispheric, 5–12 × 2–12+ mm.
6–16;
laminae yellow, 1–4 mm.
3–14;
laminae yellow or white, 3–26 mm.
9–80;
corollas 2.5–4.5 mm;
anthers ± dark purple.
7–120+;
corollas 3–6 mm;
anthers yellow to brownish.
6–16, apices shorter than folded bases.
4–14, apices shorter or longer than folded bases.
glabrous.
glabrous.
in 1 series between ray and disc florets.
in 1 series between ray and disc florets.
pappi of 10–16 white to rufous or purplish, ± equal bristles or setiform scales 2–4 mm, each proximally plumose, not adaxially woolly.
pappi 0 or of 1–22 whitish, ± equal, setiform scales 1.5–3.5 mm, each proximally plumose, seldom adaxially woolly.
= 16, 32.
Layia hieracioides
Layia pentachaeta
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.)
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.)
1. Ray corollas yellow | subsp. pentachaeta |
1. Ray corollas white | subsp. albida |
CA
WildflowerSearch
iNaturalist
USDA Plants Database
