Difference between revisions of "Layia pentachaeta"
in War Department [U.S.], Pacif. Railr. Rep. 4(5): 108. 1857.
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name=Layia pentachaeta | name=Layia pentachaeta | ||
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|authority=A. Gray in War Department [U.S.] | |authority=A. Gray in War Department [U.S.] | ||
|rank=species | |rank=species | ||
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|family=Asteraceae | |family=Asteraceae | ||
|illustrator=Barbara Alongi | |illustrator=Barbara Alongi | ||
| + | |illustration copyright=Flora of North America Association | ||
|distribution=Calif. | |distribution=Calif. | ||
|reference=None | |reference=None | ||
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|publication year=1857 | |publication year=1857 | ||
|special status= | |special status= | ||
| − | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/ | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/eaa6e58056e40c9ef614d8f47aea294977a1a5e9/coarse_grained_fna_xml/V19-20-21/V21_652.xml |
|tribe=Asteraceae tribe Heliantheae | |tribe=Asteraceae tribe Heliantheae | ||
|subtribe=Asteraceae (tribe Heliantheae) subtribe Madiinae | |subtribe=Asteraceae (tribe Heliantheae) subtribe Madiinae | ||
Revision as of 19:38, 16 December 2019
Plants 5–100 cm (self-incompatible); glandular, strongly lemon- or acrid-scented. Stems not purple-streaked. Leaf blades oblanceolate or lanceolate to linear, 6–110 mm, margins (basal leaves) 1–2-pinnatifid. Involucres ± hemispheric, 5–12 × 2–12+ mm. Phyllaries 4–14, apices shorter or longer than folded bases. Paleae in 1 series between ray and disc florets. Ray florets 3–14; laminae yellow or white, 3–26 mm. Disc florets 7–120+; corollas 3–6 mm; anthers yellow to brownish. Ray cypselae glabrous. Disc pappi 0 or of 1–22 whitish, ± equal, setiform scales 1.5–3.5 mm, each proximally plumose, seldom adaxially woolly.
Discussion
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).
Selected References
None.
Key
| 1 | Ray corollas yellow | Layia pentachaeta subsp. pentachaeta |
| 1 | Ray corollas white | Layia pentachaeta subsp. albida |