Difference between revisions of "Poteridium Spach (Q4187)"
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Latest revision as of 13:33, 24 June 2022
Poteridium is a taxon with the rank genus within the tribe Sanguisorbeae
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Poteridium Spach
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Poteridium is a taxon with the rank genus within the tribe Sanguisorbeae
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Statements
taxon/id/Poteridium Spach
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Poteridium Spach
Poteridium
Spach
FNA Editorial Committee. 2014. Flora of North America north of Mexico. Volume 9: Magnoliophyta: Picramniaceae to Rosaceae. Oxford University Press, New York.
accepted
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Stems 1–10+, ascending to erect, freely branched, glabrous or sparsely pubescent.
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Leaves deciduous, basal and cauline (basal usually withering before or at flowering);
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stipules persistent, adnate to petiole, those of basal leaves simple, lanceolate, entire, of cauline pectinately divided;
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blade oblanceolate to obovate, 2–7 cm, herbaceous, leaflets 3–8 pairs, proximally alternate, subopposite, or opposite, distally subopposite or opposite, broadly elliptic to obovate, margins flat, pectinately pinnatisect (segment margins nearly parallel), faces glabrous.
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Inflorescences terminal, also often axillary to distal leaves, 12–100+-flowered, headlike spikes, cylindric, or subglobose when poorly developed, glabrous or nearly so;
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peduncles present, sometimes absent;
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bracteoles present.
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Flowers 1–3 mm diam.;
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hypanthium urceolate, compressed at mouth, 1–3 mm, glabrous;
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sepals 4, ascending to spreading, ovate, margins scarious;
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stamens 2 (and opposite inner sepals) or 4, equal to sepals;
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carpel 1, glabrous, styles repeatedly branched, brushlike.
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Fruits achenes, 1, globose, 1.5–2 mm diam., glabrous;
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hypanthium persistent, enclosing achenes;
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cylindric
when poorly developed
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subglobose
when poorly developed
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