Ratibida Rafinesque (Q2779)
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Ratibida is a taxon with the rank genus within the tribe Heliantheae
| Language | Label | Description | Also known as |
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Ratibida Rafinesque
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Ratibida is a taxon with the rank genus within the tribe Heliantheae
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Statements
taxon/id/Ratibida Rafinesque
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Ratibida Rafinesque
Ratibida
Rafinesque
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 1–12+, erect, branched from bases, throughout, or only among heads, strigoso-hirsute, glanddotted.
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petiolate (petioles relatively shorter distally);
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blades lanceolate to ovate or oblanceolate to obovate or oblong, pinnately lobed to 1–2-pinnatifid (lobes usually rounded), ultimate margins entire or serrate, faces usually strigoso-hirsute, usually glanddotted.
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Heads radiate, borne singly or in loose, corymbiform arrays.
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Involucres ± rotate, 8–16 mm diam.
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Phyllaries persistent, 5–15 in 2 series (usually reflexed in fruit, unequal, outer longer).
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Receptacles subspheric to columnar, paleate (paleae conduplicate, linear to oblong-oblique, chartaceous proximally, herbaceous distally, apices truncate, usually densely strigose and glanddotted, each margin usually with an adaxial resin-gland; receptacles plus paleae and florets = discs, 5–70 × 5–18 mm).
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Ray-florets 3–15+, neuter;
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corollas yellow, bicolor (maroon/yellow), or wholly maroon.
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Disc-florets 50–400+, bisexual, fertile;
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corollas yellowish green, often purplish distally, tubes shorter than cylindric throats, lobes 5, obovate to triangular (glanddotted and, sometimes, hairy abaxially).
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Cypselae (black) strongly compressed, linear-oblanceolate to oblong-oblique, margins (at least abaxial) usually ciliate or pectinate-fimbriate, apices truncate and, often, ciliate, faces glabrous or sparsely hairy;
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pappi of 1–2 toothlike projections, or coroniform, or 0.
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lanceolate
ovate or oblanceolate
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lanceolate
ovate or oblanceolate
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in loose , corymbiform arrays
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linear-oblanceolate
oblong-oblique
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