Spiraea alba var. latifolia

(Aiton) Dippel
Handb. Laubholzk. 3: 484. 1893.
Common names: Broad-leaved meadowsweet spirée à larges feuilles northern or alpine or mountain meadowsweet
EndemicWeedy
Basionym: Spiraea salicifolia var. latifolia Aiton Hort. Kew. 2: 198. 1789
Synonyms: S. alba var. septentrionalis (Fernald) Fosberg S. bethlehemensis Willdenow S. carpinifolia Rafinesque S. heterophylla (Aiton) Borkhausen S. latifolia Rafinesque S. latifolia var. septentrionalis Fernald S. obovata (Fernald) Á. Löve & D. Löve S. ovata S. septentrionalis
Treatment appears in FNA Volume 9. Treatment on page 402. Mentioned on page 401.

Leaves: petiole 2–4 mm, sparsely hairy; blade broadly oblanceolate to obovate, 2–8 × 1–3 cm, length 2–3 times width, membranous, base cuneate to rounded, margins coarsely serrate, apex acute to obtuse. Panicles open, pyramidal, 5–20 × 3–10 cm. Pedicels 2–3 mm. Flowers 3–5 mm diam.; hypanthia abaxial surface glabrous or glabrate; sepals 0.8–1.5 mm; petals 1.3–1.5(–3) mm; stamens 30–35, 2 times petal length. 2n = 36, 54.


Phenology: Flowering Jun–Sep; fruiting Jun–Nov.
Habitat: Moist or dry open sites, meadows, fields, forest margins
Elevation: 0–1500 m

Distribution

V9 670-distribution-map.jpg

St. Pierre and Miquelon, N.B., Nfld. and Labr., N.S., Ont., P.E.I., Que., Conn., Del., Maine, Md., Mass., Mich., N.H., N.J., N.Y., N.C., Pa., R.I., Vt., Va., W.Va.

Discussion

Variety septentrionalis was first described by Fernald, who found it occupying a number of unique boreal and subalpine areas of the northeastern United States and southeastern Canada; it was raised to specific rank by Á. Löve and D. Löve based upon its chromosome number (2n = 54). Populations of var. latifolia that have been ascribed to var. septentrionalis are cited as differing in being alpine, subalpine, and boreal. In New Hampshire, D. D. Sperduto (2005) characterized it as an alpine and subalpine obligate that occurs in ravines and snowbed communities. A. Haines (pers. comm.) could not find any unique floral morphological characteristic to distinguish populations of var. septentrionalis from var. latifolia. Additional work is needed to determine if the polyploid populations (identified as var. septentrionalis) have unique ecological tolerances and if other physiological or morphological characteristics will allow consistent distinction from var. latifolia.

Selected References

None.

Lower Taxa

None.

Richard Lis +
(Aiton) Dippel +
Spiraea salicifolia var. latifolia +
Broad-leaved meadowsweet +, spirée à larges feuilles +  and northern or alpine or mountain meadowsweet +
St. Pierre and Miquelon +, N.B. +, Nfld. and Labr. +, N.S. +, Ont. +, P.E.I. +, Que. +, Conn. +, Del. +, Maine +, Md. +, Mass. +, Mich. +, N.H. +, N.J. +, N.Y. +, N.C. +, Pa. +, R.I. +, Vt. +, Va. +  and W.Va. +
0–1500 m +
Moist or dry open sites, meadows, fields, forest margins +
Flowering Jun–Sep +  and fruiting Jun–Nov. +
Handb. Laubholzk. +
Endemic +  and Weedy +
S. alba var. septentrionalis +, S. bethlehemensis +, S. carpinifolia +, S. heterophylla +, S. latifolia +, S. latifolia var. septentrionalis +, S. obovata +, S. ovata +  and S. septentrionalis +
Spiraea alba var. latifolia +
Spiraea alba +
variety +