Xanthium Linnaeus (Q2807)
Xanthium is a taxon with the rank genus within the tribe Heliantheae
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Xanthium Linnaeus
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Xanthium is a taxon with the rank genus within the tribe Heliantheae
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Statements
taxon/id/Xanthium Linnaeus
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Xanthium Linnaeus
Xanthium
Linnaeus
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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Stems erect, branched.
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blades lanceolate, linear, ovate, rounded-deltate, or suborbiculate, often ± palmately or pinnately lobed, ultimate margins entire or ± toothed, faces hirtellous or ± strigose, usually glanddotted as well.
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Heads discoid, either pistillate (proximal) or functionally staminate (distal), in racemiform to spiciform arrays or borne singly (in axils).
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Pistillate heads: involucres ± ellipsoid, 2–5+ mm diam. at anthesis (6–20+ mm diam. at maturity);
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phyllaries 30–75+ in 6–12+ series, outer 5–8 distinct, the rest (sometimes interpreted as paleae) proximally connate, their distinct tips mostly ± hooked (the distal 1–3 usually longer, stouter, and not hooked), the whole becoming a hard, prickly perigynium (a bur);
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florets 2, corollas 0.
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Staminate heads: involucres ± saucer-shaped, 3–5 mm diam.;
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phyllaries 6–16+ in 1–2+ series, distinct to bases;
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receptacles conic to columnar;
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paleae spatulate to cuneiform or linear, membranous, distally ± villous or hirtellous;
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florets 20–50+, corollas whitish, ± funnelform, lobes 5, erect or reflexed (filaments connate, anthers distinct or weakly coherent).
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Cypselae (black) ± fusiform, enclosed in obovoid to ellipsoid, hard, prickly, 2-chambered burs;
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often more or less; more or less palmately; palmately; pinnately
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