Aruncus Linnaeus (Q4439)
Aruncus is a taxon with the rank genus within the tribe Spiraeeae
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Aruncus Linnaeus
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Aruncus is a taxon with the rank genus within the tribe Spiraeeae
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Statements
taxon/id/Aruncus Linnaeus
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Aruncus Linnaeus
Aruncus
Linnaeus
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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Herbs, perennial, clump-forming, 5–15 (–20) dm, herbage glabrous or sparsely to densely hairy, hairs simple, straight to curved, sometimes multicellular or glandular;
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rhizomatous, rhizomes thick, branching, woody;
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roots coarse, fibrous.
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Stems 1–5, erect, stout, simple, sometimes glaucous.
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Leaves deciduous, cauline, alternate, 2–3-irregularly ternate to odd-pinnate, equivalent to 2–3 pinnate;
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petiole present, relatively long, base 1/2 sheathing stems;
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blade broadly ovate, cauline reduced in size and complexity distally, 15–60 cm, thick to thin, leaflets 9–45, long-petiolulate, broadly ovate to narrowly lanceolate, margins flat, [serrate to] doubly serrate, venation pinnate.
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Inflorescences terminal, 500–2500-flowered, racemes forming panicles;
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bracteoles present hairs simple, glandular.
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Pedicels present.
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Flowers unisexual (plants dioecious, rarely polygamous), 3–4 mm diam.;
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epicalyx bractlets 0;
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hypanthium shallowly bowl-shaped, 0.5–1 mm, nectary ring inside with simple, glandular-hairs;
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sepals persistent, 5, spreading, triangular, margins entire;
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petals 5, white, obovate to elliptic, base cuneate;
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staminate: stamens (15–) 20 (–30) in 1 series (between calyx and nectar ring), longer than petals;
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pistillate: nectar ring scarcely developed, stamens rudimentary, carpels 3, free, glabrous, styles terminal;
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Fruits follicles, 3 (or 4), pedicels recurving, fruits inverted, retrorse, ovate-elongate, 1.5–5 mm, shining, glabrous, dehiscent along whole adaxial suture;
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hypanthium persistent;
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sepals persistent, spreading to appressed;
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styles persistent, forming a beak.
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Seeds 2–4, elongate, membranous, caudate at both ends, scalariform-reticulate, seed-coat loose.
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2-3-irregularly ternate
odd-pinnate
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glabrous or
sparsely densely hairy
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broadly ovate
narrowly lanceolate
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