Pyrrocoma Hooker (Q2281)
Pyrrocoma is a taxon with the rank genus within the tribe Astereae
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Pyrrocoma Hooker
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Pyrrocoma is a taxon with the rank genus within the tribe Astereae
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Statements
taxon/id/Pyrrocoma Hooker
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Pyrrocoma Hooker
Pyrrocoma
Hooker
FNA Editorial Committee. 2006. Flora of North America north of Mexico. Volume 20: Magnoliophyta: Asteridae, part 7: Asteraceae, part 2. Oxford University Press, New York.
accepted
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Stems decumbent to ascending or erect (leafy or subscapiform, often red-tinged), mostly simple.
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basal usually short-petiolate, cauline sessile;
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basal blades 1-nerved, oblanceolate to elliptic or nearly linear (3–250 (–450) × 3–30 mm, bases usually attenuate), margins entire or spinulose-dentate or serrate or shallowly laciniate;
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cauline often lanceolate, reduced distally (bases sometimes clasping).
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Heads usually radiate or disciform, rarely discoid, borne singly or 2–5 (–15) in racemiform, spiciform, or loose, corymbiform arrays (subtended by leafy bracts in P. carthamoides and P. radiata).
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Involucres hemispheric to narrowly campanulate, 5–15 (–30) × 5–60 mm.
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Phyllaries 10–40 in 2–6 series, appressed to loosely spreading, 1-nerved, oblanceolate to oblong or linear, equal or unequal, usually herbaceous and yellow-green or with distinct, green apical patch, sometimes proximal 2/3 white-indurate (apices occasionally squarrose, obtuse or acute, occasionally mucronate), faces glabrous or densely villous to tomentose.
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Receptacles convex, pitted, epaleate.
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Ray-florets 10–80, pistillate, fertile;
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corollas yellow (usually 10–35 mm, sometimes reduced, not surpassing involucres).
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Disc-florets 20–100, bisexual, fertile;
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corollas yellow, tubes ± equaling tubular-funnelform throats, lobes 5, erect, deltate;
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style-branch appendages triangular.
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Cypselae subcylindro-fusiform, terete to ± flattened, 3–4-angled, faintly 10–12-nerved, faces sericeous to strigose or glabrous;
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pappi persistent, of 15–60 brownish, rigid, unequal, smooth, apically attenuate bristles in 1 series.
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decumbent
ascending or erect
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serrate or shallowly laciniate
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hemispheric
narrowly campanulate
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subcylindro-fusiform
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more or less flattened
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sericeous
strigose or glabrous
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