Iva Linnaeus (Q2774)
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Iva is a taxon with the rank genus within the tribe Heliantheae
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Iva Linnaeus
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Iva is a taxon with the rank genus within the tribe Heliantheae
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Statements
taxon/id/Iva Linnaeus
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Iva Linnaeus
Iva
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, subshrubs, or shrubs, 10–350 cm.
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Stems usually erect, sometimes decumbent to sprawling, often freely branched.
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petiolate or sessile;
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blades (1-nerved or 3-nerved) deltate, elliptic, filiform, lanceolate, linear, obovate, ovate, spatulate, or trullate, margins entire or toothed, faces glabrous or ± scabrellous, often glanddotted.
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Heads discoid or ± disciform, in (± bracteate) racemiform or spiciform arrays (heads 1–2 in axil of each bract, bracts sometimes leaflike).
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Involucres ± hemispheric or turbinate to campanulate or urceolate, 2–10+ mm diam.
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Phyllaries persistent, 3–15+ in 1–3+ series, distinct or ± connate, all ± herbaceous or inner scarious to membranous.
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Receptacles flat or convex to hemispheric;
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paleae cuneiform or spatulate to linear or setiform, ± membranous, sometimes all or partially wanting.
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Pistillate florets usually 1–8+, rarely 0;
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corollas whitish (inconspicuous), ± tubular.
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Functionally staminate florets 3–20+;
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corollas whitish to pinkish, funnelform, lobes 5, soon reflexed (filaments ± connate, anthers coherent or distinct).
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Cypselae plumply obovoid to pyriform, often ± obcompressed, sometimes scabrellous or hispidulous distally, usually ± glanddotted;
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less hemispheric or turbinate
campanulate or urceolate
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obcompressed
often more or less
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