Aruncus

Linnaeus

Opera Var., 259. 1758.

Common names: Goat’s-beard bride’s-feathers barbe-de-bouc
Etymology: Greek arunkos, goat’s beard, alluding to showy fingerlike clusters forming feathery flowers
Treatment appears in FNA Volume 9. Treatment on page 422. Mentioned on page 398, 416.

Herbs, perennial, clump-forming, 5–15 (–20) dm, herbage glabrous or sparsely to densely hairy, hairs simple, straight to curved, sometimes multicellular or glandular; rhizomatous, rhizomes thick, branching, woody; roots coarse, fibrous. Stems 1–5, erect, stout, simple, sometimes glaucous. Leaves deciduous, cauline, alternate, 2–3-irregularly ternate to odd-pinnate, equivalent to 2–3 pinnate; petiole present, relatively long, base 1/2 sheathing stems; 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. Inflorescences terminal, 500–2500-flowered, racemes forming panicles; bracts present; bracteoles present hairs simple, glandular. Pedicels present. Flowers unisexual (plants dioecious, rarely polygamous), 3–4 mm diam.; epicalyx bractlets 0; hypanthium shallowly bowl-shaped, 0.5–1 mm, nectary ring inside with simple, glandular-hairs; sepals persistent, 5, spreading, triangular, margins entire; petals 5, white, obovate to elliptic, base cuneate; staminate: stamens (15–) 20 (–30) in 1 series (between calyx and nectar ring), longer than petals; torus minute; pistillate: nectar ring scarcely developed, stamens rudimentary, carpels 3, free, glabrous, styles terminal; ovules 2–4. Fruits follicles, 3 (or 4), pedicels recurving, fruits inverted, retrorse, ovate-elongate, 1.5–5 mm, shining, glabrous, dehiscent along whole adaxial suture; hypanthium persistent; sepals persistent, spreading to appressed; styles persistent, forming a beak. Seeds 2–4, elongate, membranous, caudate at both ends, scalariform-reticulate, seed-coat loose. x = 7, 9.

Distribution

North America, Eurasia, temperate regions

Discussion

Species 1.

Selected References

None.

Lower Taxa

"thick" is not a number.

... more about "Aruncus"
T. Lawrence Mellichamp +
Linnaeus +
compound +  and simple +
opposite +  and alternate +
cuneate +
reduced +
15 cm150 mm <br />0.15 m <br /> (60 cm600 mm <br />0.6 m <br />) +
thick +  and thin +
2-3-irregularly ternate +  and odd-pinnate +
Goat’s-beard +, bride’s-feathers +  and barbe-de-bouc +
North America +, Eurasia +  and temperate regions +
not +  and aggregated +
Greek arunkos, goat’s beard, alluding to showy fingerlike clusters forming feathery flowers +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
retrorse +  and inverted +
ovate-elongate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
not +  and aggregated +
not +  and aggregated +
rhizomatous +, glandular +, multicellular +  and simple +
straight +  and curved +
glabrous or +  and sparsely densely hairy +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
500-2500-flowered +
crassinucellate +
compound +  and simple +
deciduous +
long-petiolulate +
broadly ovate +  and narrowly lanceolate +
entire +, pinnate +  and serrate +
toothed +, unlobed +  and lobed +
inferior +  and superior +
biseriate +  and clustered +
collateral +  and apical +
2 +  and 4 +
0 (?) +  and 4 (?) +
free +  and distinct +
adnate +, free +, connate +  and distinct +
Opera Var., +
not arillate +
caudate;elongate +
membranous +
persistent +
free +  and distinct +
spreading +  and appressed +
triangular +
free +  and distinct +
rudimentary +
1 +  and 5 +
persistent +
distinct +
basal +, lateral +, subterminal +  and terminal +
not elongate +
Aruncus +
Rosaceae tribe Spiraeeae +
inconspicuous +
pistillate +  and staminate +
herb +  and clump-forming +