Silybum Adanson (Q3046)
Silybum is a taxon with the rank genus within the tribe Cardueae
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| English |
Silybum Adanson
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Silybum is a taxon with the rank genus within the tribe Cardueae
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Statements
taxon/id/Silybum Adanson
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Silybum Adanson
Silybum
Adanson
FNA Editorial Committee. 2006. Flora of North America north of Mexico. Volume 19: Magnoliophyta: Asteridae, part 6: Asteraceae, part 1. Oxford University Press, New York.
accepted
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Annuals or biennials, taprooted, 15–300 cm, herbage glabrous, puberulent, or slightly tomentose, spiny.
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Stems erect, usually simple.
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petiolate (basal and proximal cauline) or sessile (distal cauline);
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blades adaxially variegated, margins dentate and often coarsely pinnately lobed, teeth and lobes spine-tipped, glabrous or puberulent.
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Heads discoid, borne singly, terminal and in distal axils.
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(Peduncles with reduced leaflike bracts.) Involucres ovoid to spheric, 15–60 mm diam.
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Phyllaries many in 4–6 series, unequal, outer and mid with appressed bases and spreading, lanceolate to ovate, spiny-fringed, terminal appendages, at least mid spine-tipped, innermost with erect, flat, entire, spineless apices.
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Receptacles flat, epaleate, covered with whitish bristles.
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corollas pink to purple, tubes slender, distally bent, abruptly expanded into short throats, lobes linear;
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stamen filaments connate, anther bases sharply short-tailed, anther appendages oblong;
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style-branches: fused portions with slightly swollen subterminal nodes, distally cylindric, distinct portions minute.
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Cypselae ovoid, slightly compressed, not ribbed, apices with smooth, entire rims, glabrous, basal attachment scars slightly angled;
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pappi falling in rings, outer of many minutely barbed, basally connate, subulate scales, inner of minute smooth bristles.
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