Difference between revisions of "Chamaechaenactis"
Bull. Torrey Bot. Club 33: 155. 1906.
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|distribution=w North America. | |distribution=w North America. | ||
|discussion=<p>Species 1.</p><!-- | |discussion=<p>Species 1.</p><!-- | ||
| − | --><p>Chamaechaenactis has been considered a close relative of Chaenactis, which has superficially similar heads. Nuclear rDNA evidence (B. G. Baldwin et al. 2002) suggests closer relationship to Bartlettia, Hymenopappus, and other members of Bahiinae sensu Baldwin. Such a placement was also suggested by Rydberg when he segregated Chamaechaenactis from Chaenactis.</p> | + | --><p><i>Chamaechaenactis</i> has been considered a close relative of <i>Chaenactis</i>, which has superficially similar heads. Nuclear rDNA evidence (B. G. Baldwin et al. 2002) suggests closer relationship to <i>Bartlettia</i>, <i>Hymenopappus</i>, and other members of Bahiinae sensu Baldwin. Such a placement was also suggested by Rydberg when he segregated <i>Chamaechaenactis</i> from <i>Chaenactis</i>.</p> |
|tables= | |tables= | ||
|references={{Treatment/Reference | |references={{Treatment/Reference | ||
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|family=Asteraceae | |family=Asteraceae | ||
|illustrator=Linny Heagy | |illustrator=Linny Heagy | ||
| + | |illustration copyright=Flora of North America Association | ||
|distribution=w North America. | |distribution=w North America. | ||
|reference=preece1953a | |reference=preece1953a | ||
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|publication year=1906 | |publication year=1906 | ||
|special status= | |special status= | ||
| − | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V19-20-21/V21_993.xml |
|tribe=Asteraceae tribe Heliantheae | |tribe=Asteraceae tribe Heliantheae | ||
|subtribe=Asteraceae (tribe Heliantheae) subtribe Chaenactidinae | |subtribe=Asteraceae (tribe Heliantheae) subtribe Chaenactidinae | ||
Latest revision as of 20:15, 5 November 2020
Perennials, 2–7(–9) cm (to 10–20+ cm across). Stems mostly subterranean (caudices relatively thick, branched; aerial stems essentially peduncles). Leaves mostly basal; alternate; petiolate; blades (1- or 3-nerved) cordate, elliptic, ovate, or rounded, margins entire or distally ± crenate, revolute to ± plane, faces ± strigose and gland-dotted, adaxial sometimes glabrescent. Heads discoid, borne singly. Involucres ± obconic, 6–15 (10–23 pressed) mm diam. Phyllaries 11–15 in 2 series (± erect, sometimes spreading in senescence, oblong to oblanceolate, ± unequal, herbaceous, abaxially densely villous, obscurely glandular). Receptacles convex, knobby, epaleate. Ray florets 0. Disc florets 10–30+, bisexual, fertile; corollas white to pinkish, tubes shorter than ± cylindric throats, lobes 5, ± deltate (style branches stigmatic in 2 lines, appendages linear-oblong, blunt). Cypselae clavate, ± quadrangular with 8–12 obscure nerves, densely piloso-strigose, eglandular; pappi persistent, of 7–11, (distinct) oblanceolate to narrowly spatulate, erose scales in 2 series (midnerves prominent). x = 16.
Distribution
w North America.
Discussion
Species 1.
Chamaechaenactis has been considered a close relative of Chaenactis, which has superficially similar heads. Nuclear rDNA evidence (B. G. Baldwin et al. 2002) suggests closer relationship to Bartlettia, Hymenopappus, and other members of Bahiinae sensu Baldwin. Such a placement was also suggested by Rydberg when he segregated Chamaechaenactis from Chaenactis.