Xanthisma de Candolle in A. P. de Candolle and A. L. P. P. de Candolle (Q2528)
Xanthisma is a taxon with the rank genus within the tribe Astereae
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Xanthisma de Candolle in A. P. de Candolle and A. L. P. P. de Candolle
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Xanthisma is a taxon with the rank genus within the tribe Astereae
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Statements
taxon/id/Xanthisma de Candolle
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Xanthisma de Candolle
Xanthisma
de Candolle
FNA Editorial Committee. 2006. Flora of North America north of Mexico. Volume 20: Magnoliophyta: Asteridae, part 7: Asteraceae, part 2. Oxford University Press, New York.
accepted
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Annuals, biennials, perennials, or subshrubs, 3–100 cm (taprooted, caudices woody, much branched [rhizomes]).
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Stems erect, spreading, or sprawling, often much branched, glabrous or hispid to hispidulous, villous, or stipitate-glandular (especially distally).
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Leaves: basal (sometimes persistent) and cauline;
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short-petiolate or sessile;
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blades 1-nerved, lanceolate to oblanceolate or spatulate (bases tapering to clasping), margins entire, serrate, dentate, pinnatifid, or 2-pinnatifid (apices of blades, lobes, and teeth apiculate to bristle-tipped, bristles 1–4 mm), faces usually glabrous, hispid, hispidulous, or villous, sometimes also stipitate-glandular.
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Heads radiate or discoid, borne singly or in corymbiform arrays.
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Involucres turbinate, campanulate, or hemispheric, (4–10 ×) 6–25 mm.
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Phyllaries 26–80+ in 2–8 series, appressed, spreading, or reflexed, 1-nerved (flat to rounded), linear to narrowly oblong or lanceolate, or enlarged distally into ovate to orbiculate or depressed-elliptic laminae, unequal, stiff, leathery, bases indurate, margins sometimes scarious, (apices herbaceous or achlorophyllous) faces hispid to hispidulous, villous, and/or stipitate-glandular.
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Receptacles flat to convex, pitted (pit borders usually laciniate or irregularly bristly, the teeth or setae 0.1–2+ mm), epaleate.
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Ray-florets 0 (in X. grindelioides and 2 Mexican taxa) or 12–60+, pistillate, fertile;
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corollas white, pink, red-purple, purple, or yellow.
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Disc-florets 15–200+, bisexual, fertile;
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corollas yellow, tubes length 1/4–1/3 ± funnelform throats (usually glabrous), lobes 5, spreading, triangular (glabrous or sparsely puberulent, hairs fine, antrorse);
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style-branch appendages lanceolate.
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Cypselae distinctly dimorphic (tan to redbrown or purple), ellipsoid to obovoid, oblong, or obscurely cordate, those of rays (if present) ± 3-sided, rounded abaxially, of disc compressed (thin or thick walled), 6–18-ribbed, faces silky (hairs antrorsely ascending to appressed);
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pappi persistent, of 30–90+ usually whitish to brown or reddish-brown, basally flattened (wider at overlapping bases), coarsely barbellate, apically attenuate bristles in 2–4 series.
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hispidulous villous or stipitate-glandular
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hispidulous villous or stipitate-glandular
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hispidulous villous or stipitate-glandular
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lanceolate
oblanceolate or spatulate
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stipitate-glandular
sometimes
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orbiculate or depressed-elliptic
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hispidulous villous and/or stipitate-glandular
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hispidulous villous and/or stipitate-glandular
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hispidulous villous and/or stipitate-glandular
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usually whitish
brown or reddish-brown
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ellipsoid
obovoid oblong or obscurely cordate
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ellipsoid
obovoid oblong or obscurely cordate
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ellipsoid
obovoid oblong or obscurely cordate
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