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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|common_names=Thompson’s pincushion | |common_names=Thompson’s pincushion | ||
| + | |special_status={{Treatment/ID/Special_status | ||
| + | |code=E | ||
| + | |label=Endemic | ||
| + | }}{{Treatment/ID/Special_status | ||
| + | |code=C | ||
| + | |label=Conservation concern | ||
| + | }} | ||
|basionyms= | |basionyms= | ||
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|publication title=in C. L. Hitchcock et al., Vasc. Pl. Pacif. N.W. | |publication title=in C. L. Hitchcock et al., Vasc. Pl. Pacif. N.W. | ||
|publication year=1955 | |publication year=1955 | ||
| − | |special status= | + | |special status=Endemic;Conservation concern |
| − | |source xml=https:// | + | |source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/bb6b7e3a7de7d3b7888a1ad48c7fd8f5c722d8d6/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 20:53, 27 May 2020
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.