Spiraea thunbergii Siebold ex Blume

Thunberg's meadowsweet (en), Spirée de Thunberg (fr)

Species

Angiosperms > Rosales > Rosaceae > Spiraea

Characteristics

Shrubs to 1.5 m. Branches spreading, arching, slender; branchlets brown to red-brown, angled, pubescent at fist, finally glabrous; buds ovoid, very small, with several scales, glabrous or puberulous. Petiole 1–2 mm, pubescent; leaf blade linear-lanceolate, 25–40 × 3–7 mm, glabrous on both surfaces, pinnately veined, base narrowly cuneate, margin sharply serrate above middle, apex long acuminate. Umbels sessile, with clustered leaves at base, 10–18 mm, 3–7-flowered; pedicels slender, 6–10 mm, glabrous. Flowers 6–8 mm in diam. Hypanthium campanulate, glabrous abaxially. Sepals triangular or ovate-triangular, 1.5–2 × 1–1.5 mm, erect or reflexed in fruit, apex acute. Petals white, obovate to suborbicular, 2–4 × 2–3.5 mm, glabrous, base shortly clawed, apex emarginate or obtuse. Stamens 18–20, to 1/3 as long as petals. Disk annular, 10-lobed. Carpels glabrous or puberulous; styles nearly equaling stamens. Follicles spreading, glabrous; styles subterminal, divergent. Fl. Apr–May, fr. Jul–Aug.
More
Shrubs, 10–20 dm. Stems spreading to arching, densely branched. Leaves ?sometimes tardily deciduous?; petiole 1–2 mm or indistinct; blade linear to lanceolate, 2.5–4 × 0.3–1 cm, membranous, base acute, margins irregularly, sharply serrulate, venation pinnate eucamptodromous, secondary veins not prominent, apex acuminate, surfaces glabrous. Inflorescences mostly axillary, hemispheric panicles, ?(2–)3–7-flowered, sessile on leafless stems in spring?, 2–6 × 2–6 cm; branches glabrous. Pedicels 5–8 mm, glabrous. Flowers 6–8 mm diam.; hypanthia crateriform, 2–4 mm, abaxial surface glabrous, adaxial glabrous or puberulent; sepals ovate-triangular, 1.3–2 mm; petals white, obovate to suborbiculate, 2–4 mm; staminodes 10–14; stamens 18–20, 0.3 times petal length. Follicles oblanceoloid, 1.5–2 mm, glabrous. 2n = 18.
Life form perennial
Growth form shrub
Growth support free-standing
Foliage retention deciduous
Sexuality hermaphrodite
Pollination entomogamy
Spread epizoochory
Mature width (meter) 1.0 - 1.5
Mature height (meter) 1.5
Root system -
Rooting depth (meter) -
Root diameter (meter) -
Flower color
Blooming months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Fruit color -
Fruiting months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Nitrogen fixer -
Photosynthetic pathway c3

Environment

Rocky hillsides.
Light 4-9
Soil humidity 3-6
Soil texture 2-5
Soil acidity 4-7
Soil nutriment -
Hardiness (USDA) 5-7

Usage

Uses environmental use medicinal
Edible -
Therapeutic use Cough (shoot), Cyanogenetic (unspecified), Anti-inflammatory agents (unspecified)
Human toxicity -
Animal toxicity -

Cultivation

Can be grown by cuttings or seedlings.
Mode cuttings seedlings
Germination duration (days) 30 - 40
Germination temperacture (C°) 12 - 18
Germination luminosity -
Germination treatment -
Minimum temperature (C°) -29
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Images

Leaf

Spiraea thunbergii leaf picture by Eric Walton (cc-by-sa)
Spiraea thunbergii leaf picture by Tim Daniel (cc-by-sa)

Flower

Spiraea thunbergii flower picture by ben vc (cc-by-sa)
Spiraea thunbergii flower picture by Anna Brammeier (cc-by-sa)
Spiraea thunbergii flower picture by David David (cc-by-sa)

Distribution

Spiraea thunbergii world distribution map, present in Canada, China, Japan, Korea (Democratic People's Republic of), Taiwan, Province of China, and United States of America

Identifiers

LSID urn:lsid:ipni.org:names:742569-1
WFO ID wfo-0000985820
COL ID 4Z6RR
BDTFX ID 75839
INPN ID 124671
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Spiraea japonica Awayus japonicus Spiraea thunbergii