Acanthospermum Schrank (Q2716)
Acanthospermum is a taxon with the rank genus within the tribe Heliantheae
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Acanthospermum Schrank
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Acanthospermum is a taxon with the rank genus within the tribe Heliantheae
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Statements
taxon/id/Acanthospermum Schrank
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Acanthospermum Schrank
Acanthospermum
Schrank
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 to ± prostrate (repeatedly “forked”).
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petiolate or ± sessile;
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blades mostly elliptic to deltate, rhombic, or ovate, sometimes lyrate, ultimate margins entire or toothed, faces usually pilosulous to sericeous or scabrellous, sometimes glabrate or glabrescent, usually glanddotted.
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Heads radiate, 1 (–3) in “forks” of branches (terminal, appearing axillary by sympodial growth).
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(becoming ± rotate in fruit).
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Phyllaries persistent (outer) or falling, 10–13 in 2 series (outer 4–6 herbaceous, inner 5–8 each investing a ray ovary, enlarging in fruit to form a perigynium, shed with enclosed cypsela).
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Receptacles convex, paleate (paleae cuneate to spatulate, ± conduplicate or flattish, membranous).
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Ray-florets 5–8, pistillate, fertile;
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corollas yellowish (tubes shorter than to equaling laminae, laminae ovate to elliptic or linear).
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Disc-florets 3–8 (–12+), functionally staminate;
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corollas yellowish, tubes shorter than funnelform or campanulate throats, lobes 5, deltate.
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Cypselae each enclosed within and shed with an often hardened, ± prickly perigynium (the ultimate “fruits” plumply ellipsoid to fusiform, or ± compressed);
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more or less prostrate
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mostly elliptic
deltate rhombic or ovate
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mostly elliptic
deltate rhombic or ovate
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mostly elliptic
deltate rhombic or ovate
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