Helianthella Torrey & A. Gray (Q2746)
Helianthella is a taxon with the rank genus within the tribe Heliantheae
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Helianthella Torrey & A. Gray
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Helianthella is a taxon with the rank genus within the tribe Heliantheae
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Statements
taxon/id/Helianthella Torrey & A. Gray
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Helianthella Torrey & A. Gray
Helianthella
Torrey & A. Gray
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, usually branched.
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usually petiolate (at least proximal);
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blades (usually 3-nerved or 5-nerved from at or near bases) elliptic, lanceolate, lance-linear, linear, oblanceolate, ovate, ovatelanceolate, or spatulate, bases mostly cuneate, margins entire, faces glabrous or hairy.
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Heads radiate, borne singly or (2–15+) in corymbiform arrays.
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Involucres campanulate to hemispheric or broader, 10–50 mm diam.
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Phyllaries persistent, 22–32+ in ± 3 series (mostly deltate-ovate or ovate to lanceolate, linear, or oblong, subequal or unequal, outer sometimes foliaceous).
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Receptacles ± convex, paleate (paleae falling with cypselae, conduplicate, scarious or chartaceous).
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Ray-florets 8–21, neuter;
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corollas ± yellow.
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Disc-florets 30–200+, bisexual, fertile;
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corollas yellow or purple to brown, tubes shorter than or equaling throats, lobes 5, deltate (abaxially hairy).
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Cypselae (brownish) ± compressed, obovate to obcordate (margins usually ± winged, usually ± ciliate, faces glabrous or strigose);
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pappi 0, or persistent, of 2 ± subulate scales plus 0–4+ shorter, lacerate scales (sometimes all ± connate).
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