Layia hieracioides
Layia heterotricha
hawkweed layia, tall tidytips
pale-yellow layia, paleyellow tidytips
purple-streaked.
not purple-streaked.
blades elliptic, lanceolate, linear, or oblanceolate, 7–150 mm, margins (basal leaves) lobed to toothed.
blades elliptic to ovate, 10–120 mm, margins (basal leaves) entire or shallowly toothed.
± ellipsoid to obconic, 4–9 × 4–9+ mm.
hemispheric, 7–12 × 6–13+ mm.
6–16;
laminae yellow, 1–4 mm.
7–13;
laminae white to cream, 5–24 mm.
9–80;
corollas 2.5–4.5 mm;
anthers ± dark purple.
40–90+;
corollas 4–7 mm;
anthers yellow to brownish.
6–16, apices shorter than folded bases.
7–13, apices usually shorter than folded bases.
glabrous.
usually glabrous, sometimes sparsely hairy.
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 (readily falling as units) of 14–20 white, ± equal bristles or setiform scales 3–6 mm, each proximally plumose, not adaxially woolly.
= 16, 32.
= 16.
Layia hieracioides
Layia heterotricha
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.)
Of conservation concern.
Layia heterotricha occurs in the South Coast Ranges, western Transverse Ranges, and Tehachapi Range. Molecular phylogenetic data have indicated that L. heterotricha is sister to all other members of Layia (B. G. Baldwin 1996). Weak, ± sterile artificial hybrids have been produced with other species of Layia (no natural hybrids have been reported; J. Clausen 1951).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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