Difference between revisions of "Packera layneae"
Phytologia 49: 47. 1981.
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|common_names=Layne’s ragwort | |common_names=Layne’s ragwort | ||
| − | |basionyms={{Treatment/ID/ | + | |basionyms={{Treatment/ID/Basionym |
|name=Senecio layneae | |name=Senecio layneae | ||
|authority=Greene | |authority=Greene | ||
| + | |publication_title=Bull. Torrey Bot. Club | ||
| + | |publication_place=10: 87. 1883 | ||
}} | }} | ||
|synonyms={{Treatment/ID/Synonym | |synonyms={{Treatment/ID/Synonym | ||
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|publication year=1981 | |publication year=1981 | ||
|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/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V19-20-21/V20_1318.xml |
|tribe=Asteraceae tribe Senecioneae | |tribe=Asteraceae tribe Senecioneae | ||
|genus=Packera | |genus=Packera | ||
Revision as of 18:41, 24 September 2019
Perennials, 40–70+ cm; taprooted (caudices erect to suberect, branched, stout). Stems 1 or 3–4+, clustered, sparsely tomentose to glabrescent. Basal leaves (and proximal cauline, relatively thick and turgid) petiolate; blades narrowly elliptic or lanceolate to oblanceolate, 40–70+ × 5–20+ mm, bases tapering, margins entire or subentire to weakly and irregularly dentate (especially at apices). Cauline leaves gradually reduced (distal sessile, bractlike). Heads 5–12+ in open, cymiform arrays. Peduncles bracteate (bractlets usually red-tipped), sparsely tomentose to glabrate. Calyculi conspicuous (bractlets red-tipped). Phyllaries 13 or 21, dark green proximally, becoming light green distally (tips red), 7–11+ mm, floccose-tomentose proximally. Ray florets 5 or 8; corolla laminae 12–16 mm. Disc florets 50–60+; corolla tubes 3.5–4.5 mm, limbs 4.5–5.5 mm. Cypselae 2.5–3.5 mm, glabrous; pappi 7–8 mm. 2n = 92.
Phenology: Flowering early May–early Jul.
Habitat: Openings, disturbed areas, in chaparral, serpentine soils
Elevation: 300–900 m
Discussion
Of conservation concern.
Packera layneae is known only from the foothills of the western slope of the Sierra Nevada.
Selected References
None.