Aruncus dioicus var. vulgaris

(Maximowicz) H. Hara

J. Jap. Bot. 30: 68. 1955.

Introduced
Basionym: Aruncus sylvester var. vulgaris Maximowicz Trudy Imp. S.-Petersburgsk. Bot. Sada 6: 170. 1879
Synonyms: Spiraea aruncus Linnaeus
Treatment appears in FNA Volume 9. Treatment on page 424. Mentioned on page 423.

Leaf surfaces usually glabrous. Styles 0.3–0.5 mm. Follicles slender, 2.5–3 mm. Seeds 1.8–2.5 mm. 2n = 14, 18.


Phenology: Flowering summer.
Habitat: Rich woods
Elevation: 10–500 m

Distribution

V9 717-distribution-map.jpg

Introduced; N.S., Ont., Que., Conn., Del., Maine, Mich., N.J., N.Y., Wis., c Europe, Asia (Caucasus)

Discussion

Variety vulgaris seems to be introduced and locally naturalized in the North America. The variety differs very little from var. acuminatus and may prove to be identical. The longer follicles of var. acuminatus seem to be the only difference, though H. Hara (1955) said that the petals of var. vulgaris are larger than those of the other varieties. One may wonder whether this European-Asian taxon is a westward circum-Pacific extension of the American var. acuminatus, or whether the latter is an eastward extension of var. vulgaris. Aruncus dioicus in the broad sense displays the classic Arcto-Tertiary Mesoflora distribution pattern, and it is impossible to say where it originated, though the greatest diversity of varieties (ten) is in eastern Asia (Hara). The names A. aruncus (Linnaeus) H. Karsten and A. vulgaris Rafinesque are invalid and linked to this variety.

Selected References

None.

Lower Taxa

None.

"thick" is not a number.

T. Lawrence Mellichamp +
(Maximowicz) H. Hara +
compound +  and simple +
opposite +  and alternate +
subcordate +  and attenuate +
Aruncus sylvester var. vulgaris +
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 +
N.S. +, Ont. +, Que. +, Conn. +, Del. +, Maine +, Mich. +, N.J. +, N.Y. +, Wis. +, c Europe +  and Asia (Caucasus) +
not +  and aggregated +
10–500 m +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 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 +
Rich woods +
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 +
green +  and gray-green +
broadly ovate +  and narrowly lanceolate +
6 cm60 mm <br />0.06 m <br /> (15 cm150 mm <br />0.15 m <br />) +
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 +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Flowering summer. +
adnate +, free +, connate +  and distinct +
J. Jap. Bot. +
not arillate +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
caudate;elongate +
1.8mm +  and 2.5mm +
membranous +
persistent +
free +  and distinct +
spreading +  and appressed +
triangular +
1 cm10 mm <br />0.01 m <br /> (?) +
Introduced +
free +  and distinct +
rudimentary +
1.5mm +  and 2mm +
1 +  and 5 +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
persistent +
distinct +
basal +, lateral +, subterminal +  and terminal +
not elongate +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
Spiraea aruncus +
Aruncus dioicus var. vulgaris +
Aruncus dioicus +
variety +
inconspicuous +
pistillate +  and staminate +
herb +  and clump-forming +