Aruncus dioicus var. vulgaris

(Maximowicz) H. Hara

J. Jap. Bot. 30: 68. 1955

Introduced
Basionyms: 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

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 </i>var.<i> acuminatus and may prove to be identical. The longer follicles of </i>var.<i> acuminatus seem to be the only difference, though H. Hara (1955) said that the petals of </i>var.<i> 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 </i>var.<i> acuminatus, or whether the latter is an eastward extension of </i>var.<i> 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.

References

None.

Lower Taxa

No lower taxa listed.