Layia hieracioides
Layia leucopappa
hawkweed layia, tall tidytips
Comanche point layia, Comanche point tidytips
purple-streaked.
not purple-streaked.
blades elliptic, lanceolate, linear, or oblanceolate, 7–150 mm, margins (basal leaves) lobed to toothed.
blades oblong to oblanceolate, 6–50(–80) mm, margins (basal leaves) toothed to lobed.
± ellipsoid to obconic, 4–9 × 4–9+ mm.
hemispheric to depressed-hemispheric, 3.5–8(–11) × 4–10(–13) mm.
6–16;
laminae yellow, 1–4 mm.
6–15;
laminae white, 3–12(–19) mm.
9–80;
corollas 2.5–4.5 mm;
anthers ± dark purple.
20–100+;
corollas 2.5–5 mm;
anthers yellow to brownish.
6–16, apices shorter than folded bases.
6–15, apices longer or shorter than folded bases.
glabrous.
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 10–13 white, lanceolate, acuminate, ± equal scales 2–3.5 mm, not plumose, not adaxially woolly (bases sparsely setose).
= 16, 32.
= 14.
Layia hieracioides
Layia leucopappa
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 leucopappa occurs in the Comanche and Tejon hills (western Tehachapi Range). Populations of the southern San Joaquin Valley (south and east of Bakersfield) have been extirpated.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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