Chaenactis de Candolle in A. P. de Candolle and A. L. P. P. de Candolle (Q2549)
Chaenactis is a taxon with the rank genus within the tribe Chaenactideae
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Chaenactis de Candolle in A. P. de Candolle and A. L. P. P. de Candolle
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Chaenactis is a taxon with the rank genus within the tribe Chaenactideae
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Statements
taxon/id/Chaenactis de Candolle
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Chaenactis de Candolle
Chaenactis
de Candolle
FNA Editorial Committee. 2006. Flora of North America north of Mexico. Volume 21: Magnoliophyta: Asteridae, part 8: Asteraceae, part 3. Oxford University Press, New York.
accepted
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Annuals, biennials, perennials, or subshrubs, (2–) 5–70 (–200) cm (taprooted).
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Stems erect to prostrate, usually branched.
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usually petiolate;
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blades deltate, elliptic, linear, oblanceolate, or ovate (plane or ± 3-dimensional), (0–) 1–4-pinnately (rarely -subpalmately) lobed, ultimate margins entire, faces glabrous or hairy, often stipitate-glandular or glanddotted.
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Heads discoid or ± radiant, borne singly or in (terminal) ± cymiform arrays (erect in bud except C. macrantha).
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Involucres hemispheric to obconic or broadly cylindric, (3–) 5–15 [–25] mm diam.
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Phyllaries 5–21+ in 1–2 (–3) series (subequal to unequal).
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Receptacles convex to ± flat, pitted and/or knobby, usually epaleate (paleae 3–10+ in C. carphoclinia).
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Ray-florets 0 (sometimes simulated by enlarged peripheral disc corollas).
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Disc-florets 8–70+, bisexual, fertile (diurnal with anthers exserted except in C. macrantha);
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corollas white, pinkish, cream, or yellow, tubes shorter than cylindric or funnelform throats, lobes 5, deltate to ± lanceolate (sometimes enlarged, unequal; style-branch appendages blunt, obscure).
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Cypselae clavate to ± cylindric or compressed, obscurely 8–20-angled, faces scabrous and strigose to densely sericeous (usually eglandular);
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pappi usually persistent, of (1–) 4–20, distinct, ± erose scales in 1–4 series (equal or unequal, outer then shorter, scales usually fewer and/or shorter on peripheral cypselae, midnerves obscure), sometimes 0 or coroniform.
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(n = 6, 8, plus polyploids and dysploid numbers).
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hemispheric
obconic or broadly cylindric
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in more or less cymiform arrays
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clavate
more or less cylindric or compressed
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