Tripleurospermum Schultz-Bipontinus (Q2121)
Tripleurospermum is a taxon with the rank genus within the subtribe Anthemidinae
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Tripleurospermum Schultz-Bipontinus
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Tripleurospermum is a taxon with the rank genus within the subtribe Anthemidinae
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Statements
taxon/id/Tripleurospermum Schultz-Bipontinus
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Tripleurospermum Schultz-Bipontinus
Tripleurospermum
Schultz-Bipontinus
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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Stems 1–5+, usually erect or ascending, sometimes procumbent, branched or simple, glabrous or sparsely hairy (hairs basifixed).
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petiolate or sessile;
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blades oblong, 1–3-pinnately lobed, ultimate margins crenate or serrate, faces glabrous or sparsely hairy.
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Heads radiate [discoid or disciform], borne singly or in corymbiform arrays.
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Involucres hemispheric to patelliform, 8–12+ mm diam.
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Phyllaries persistent, 28–60+ in 2–5 series, distinct, broadly ovate, unequal to subequal, margins and apices (pale to dark-brown or black) narrowly to widely scarious (abaxial faces glabrous).
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Receptacles convex to conic (± solid), epaleate.
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Ray-florets [0] 10–34+, pistillate, fertile;
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corollas white [seldom pinkish], laminae mostly oblong.
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Disc-florets 300–500, bisexual, fertile;
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corollas yellow [greenish], tubes cylindric (sessile-glandular), throats narrowly campanulate (cylindric or compressed), lobes 5, deltate (with resin sacs).
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Cypselae trigonous, ± compressed (apices truncate), ribs 3–5 (0–2 abaxial, 2 lateral, 1 adaxial, usually whitish, relatively thick, smooth), faces often rugose or tuberculate abaxially and between ribs and glabrous (pericarps sometimes with myxogenic cells and usually 2–3, sometimes 1–5, abaxial-apical resin sacs; embryo-sac development tetrasporic);
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