Ambrosia Linnaeus (Q2718)
Ambrosia is a taxon with the rank genus within the tribe Heliantheae
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Ambrosia Linnaeus
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Ambrosia is a taxon with the rank genus within the tribe Heliantheae
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Statements
taxon/id/Ambrosia Linnaeus
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Ambrosia Linnaeus
Ambrosia
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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Annuals, perennials, or shrubs, 10–400+ cm (usually rhizomatous).
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Stems erect, decumbent, or prostrate, branched.
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Leaves usually cauline;
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sessile or petiolate;
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blades (or lobes) deltate, elliptic, filiform, lanceolate, linear, obovate, ovate, or rhombic (and most intermediate shapes), usually pinnately, sometimes palmately lobed, ultimate margins entire or toothed, faces hairy or glabrate, usually glanddotted or stipitate-glandular.
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Heads discoid (unisexual, pistillate proximal to or intermixed with staminates, staminates usually in racemiform to spiciform arrays; rarely, single plants all or mostly staminate or pistillate).
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Pistillate heads: phyllaries 12–30 (–80+) in 1–8+ series, outer (1–) 5–8 distinct or ± connate, herbaceous, the rest (sometimes interpreted as paleae) ± connate, usually with free tips forming tubercles, spines, or wings (the whole becoming a hard perigynium or “bur”);
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florets 1 (–5+), corollas 0.
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Staminate heads: involucres cupshaped to saucer-shaped, 1.5–6+ mm diam.;
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phyllaries 5–16+ in ± 1 series, ± connate;
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receptacles ± flat or convex;
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paleae spatulate to linear, membranous, sometimes villous, hirtellous, and/or glanddotted or stipitate-glandular, sometimes none;
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corollas whitish or purplish, ± funnelform, lobes 5, erect or incurved;
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staminal filaments connate, anthers distinct or weakly coherent.
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Cypselae (black) ± ovoid or fusiform, enclosed within globose to obovoid, pyramidal, pyriform, obconic, or fusiform, hard, smooth, tuberculate, spiny, or winged “burs”;
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opposite
more or less throughout; throughout
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usually pinnately; pinnately; sometimes palmately
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globose
obovoid pyramidal pyriform obconic or fusiform
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globose
obovoid pyramidal pyriform obconic or fusiform
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globose
obovoid pyramidal pyriform obconic or fusiform
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globose
obovoid pyramidal pyriform obconic or fusiform
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globose
obovoid pyramidal pyriform obconic or fusiform
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