Difference between revisions of "Chaenactis thompsonii"
in C. L. Hitchcock et al., Vasc. Pl. Pacif. N.W. 5: 123, fig. [p. 125]. 1955.
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name=Chaenactis thompsonii | name=Chaenactis thompsonii | ||
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|authority=Cronquist in C. L. Hitchcock et al. | |authority=Cronquist in C. L. Hitchcock et al. | ||
|rank=species | |rank=species | ||
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|publication year=1955 | |publication year=1955 | ||
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| − | |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_1023.xml |
|tribe=Asteraceae tribe Heliantheae | |tribe=Asteraceae tribe Heliantheae | ||
|subtribe=Asteraceae (tribe Heliantheae) subtribe Chaenactidinae | |subtribe=Asteraceae (tribe Heliantheae) subtribe Chaenactidinae | ||
Revision as of 19:32, 16 December 2019
Perennials, 10–30 cm (not or scarcely cespitose, not matted); proximal indument thinning with age, grayish, arachnoid-sericeous to thinly lanuginose. Stems mostly 5–15+, ascending to erect. Leaves mostly cauline, 2–5 cm; largest blades ± elliptic, ± plane, 1-pinnately lobed; lobes mostly 2–5 pairs, remote, ± plane. Heads mostly 1–3 per stem. Peduncles ascending to erect, 2–5 cm. Involucres ± obconic. Phyllaries: longest (10–)12–15 mm; outer closely lanuginose, not stipitate-glandular, apices erect, ± rigid. Corollas 7–9 mm. Cypselae 7–9 mm (eglandular); pappi: longest scales 3.5–5 mm.
Phenology: Flowering Jun–Aug.
Habitat: Rocky or gravelly serpentine slopes, scree, talus, openings in or above conifer forests
Elevation: (900–)1200–2200 m
Discussion
Of conservation concern.
Chaenactis thompsonii appears to be sister to C. evermannii; it is known from the mountains of central and northwestern Washington. The similar habits of C. thompsonii and C. ramosa (= C. douglasii var. douglasii) appear to result from convergent evolution in the distinctive habitat of their type localities (Wenatchee Mountains), not from a close genetic relationship as suggested by Cronquist.
Selected References
None.