Arctanthemum (Tzvelev) Tzvelev (Q2090)
Arctanthemum is a taxon with the rank genus within the subtribe Artemisiinae
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Arctanthemum (Tzvelev) Tzvelev
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Arctanthemum is a taxon with the rank genus within the subtribe Artemisiinae
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Statements
taxon/id/Arctanthemum (Tzvelev) Tzvelev
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Arctanthemum (Tzvelev) Tzvelev
Arctanthemum
(Tzvelev) Tzvelev
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 (per rosette), ascending, usually simple, sometimes branched distally, glabrous or ± woolly (hairs basifixed).
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petiolate or sessile (distal);
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blades (± fleshy) fan-shaped, cuneate, or spatulate to narrowly lanceolate (distally), usually pinnati-palmately lobed (lobes 3–7), ultimate margins coarsely crenate, dentate (at apices of lobes), or entire (distally), faces ± woolly, glabrescent.
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Heads radiate, borne singly or in 2s or 3s.
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Involucres patelliform to hemispheric, 13–29 mm diam.
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Phyllaries persistent, (22–) 25–34 (–44) in 3 (–4) series, distinct, lanceolate to oblong, unequal, margins and apices (hyaline and colorless or brownish) scarious.
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Receptacles dome-shaped (glabrous), epaleate.
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Ray-florets (9–) 14–25 (–30), pistillate, fertile;
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corollas white, laminae lance-elliptic or elliptic to oblong or oblong-lanceolate.
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Disc-florets 140–360+, bisexual, fertile;
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corollas yellow, tubes broadly cylindric, throats campanulate, lobes 5, deltate (without resin sacs).
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Cypselae cylindro-obconic, ribs 5–8 (–10), faces glabrous, usually gland-dotted (pericarps without myxogenic cells or resin sacs; embryo-sac development monosporic);
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spatulate
narrowly lanceolate
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spatulate
narrowly lanceolate
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usually pinnati-palmately
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elliptic to oblong or oblong-lanceolate
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