Weigela japonica Thunb.

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Credits

Article from Bean's Trees and Shrubs Hardy in the British Isles

Recommended citation
'Weigela japonica' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/weigela/weigela-japonica/). Accessed 2020-01-27.

Genus

Synonyms

  • Diervilla japonica (Thunb.) DC.

Glossary

calyx
(pl. calyces) Outer whorl of the perianth. Composed of several sepals.
corolla
The inner whorl of the perianth. Composed of free or united petals often showy.
herbarium
A collection of preserved plant specimens; also the building in which such specimens are housed.
calyx
(pl. calyces) Outer whorl of the perianth. Composed of several sepals.
corolla
The inner whorl of the perianth. Composed of free or united petals often showy.
endemic
(of a plant or an animal) Found in a native state only within a defined region or country.
glabrous
Lacking hairs smooth. glabrescent Becoming hairless.
linear
Strap-shaped.
ovate
Egg-shaped; broadest towards the stem.
panicle
A much-branched inflorescence. paniculate Having the form of a panicle.

References

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Credits

Article from Bean's Trees and Shrubs Hardy in the British Isles

Recommended citation
'Weigela japonica' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/weigela/weigela-japonica/). Accessed 2020-01-27.

Shrub to 5 m, branches conspicuously hairy when young.Leaves ovate or oblong 4–12 x 2–5 cm, apex caudate or acuminate, base cuneate or rounded, margin shallowly serrate, both surfaces hairy, densely hairy on veins on lower surface, lateral veins 4–6 , petiole 0.5–1.2 cm, hairy. Cymes axillary or terminal on previous year’s growth,1 or 2–flowered. Peduncle < 0.5 cm, hairy or glabrous, bracts and, bracteoles lanceolate, 2–12 mm, caducous. Calyx tube 5–lobed, radially symmetric, linear or awl–shaped, free less than half of length, 0.5–1.2 x ca. 0.1 cm, hairy. Corolla funnel–shaped, 2.5–3.5 x 1.5–2.5 cm, abruptly widening from the base, pale yellow or pale brown purple in bud, red lavender outside, dark red inside, hairy outside. Corolla tube 2–2.7 cm, hairy or becoming glabrous inside, corolla 5–lobed, radially symmetric, ovate or rounded, 0.5–0.7 cm long (ca.  20–25% of length of corolla tube). Stamen almost as long as corolla, filaments 0.6–0.8 cm, glabrous; anthers, free, linear ca. 0.5 cm, yellow. Style longer than corolla, 3–4.5 cm long, glabrous, stigma disk–like, ca. 3 mm diameter. Fruit cylindrical, slightly curved, 1.7–2.7 cm long, dehiscing from apex, hairy. Seeds ellipsoid, 1.5 mm long, with narrow wings on three sides.

Based on Iwatsuki, K. (ed) (1993)

Flowers: April to June.

Fruits: September to November.

Distribution  Japan Kyushu

Habitat Open areas on hills and moutains. 100-1800 m

Taxonomic note This species is endemic to Japan. There is record from Korea, Moran 5169 in US National Herbarium, which is W. subsessilis.

A deciduous shrub, 6 to 9 ft high; young shoots nearly glabrous. Leaves oval or ovate, 2 to 4 in. long, about half as wide, toothed, long and taper-pointed, densely felted with pale down beneath, slightly hairy above; stalk 14 in. or less long, bristly on the edges. Flowers mostly in threes, terminal and in the leaf-axils of short side twigs, forming a leafy panicle 3 to 5 in. long. Corolla between funnel- and bell-shaped, 1 to 114 in. long, less in width, rather downy outside; pale rose at first, changing to carmine. Calyx-lobes linear, more or less downy.

Native of Japan; introduced to the USA in 1892 and to Britain soon afterwards. It is allied to W. floribunda, which it resembles in having the calyx divided to the base into linear lobes and in the often downy outer surface of the corolla, but the down on the undersurface of the leaves is more velvety and the flowers differ much in colour from the almost blood-red ones of W. floribunda.


var. sinica (Rehder) L. H. Bailey

Synonyms
Diervilla japonica var. sinica Rehder
Weigela sinica (Rehder) H. Hara

Shrub to 6 m, branches conspicuously hairy when young. Leaves ovate or ovate elliptic, 5–15 x 3–8 cm, apex caudate or acuminate, base cuneate or rounded, margin shallowly serrate, sparsely hair on upper surface, densely hairy on lower surface, lateral veins 5–6, petiole 0.8–1.2 cm, hairy. Cymes, axillary or terminal on previous year’s growth, 3–flowered. Peduncle < 0.5 cm, hairy or glabrous, bracts and, bracteoles lanceolate, 2–12 mm, caducous. Calyx tube 5–lobed, radially symmetric, linear or awl–shaped, free half of length or more, 1–1.2 x ca. 0.1 cm, hairy. Corolla funnel–shaped, 2.5–3.5 x 1.5–2.5 cm, abruptly widening above the caylx lobes, white or red in bud, becoming red outside, dark red inside, sparsely hairy outside. Corolla tube 2–2.7 cm, hairy or becoming glabrous inside, corolla 5–lobed, radially symmetric, ovate or rounded, 0.5–0.7 cm long (ca.  20–25% of length of corolla tube). Stamen almost as long as corolla, filaments 0.6–0.8 cm, glabrous; anthers, free, linear ca. 0.5 cm, yellow. Style longer than corolla, 3–4.5 cm long, glabrous, stigma disk–like, ca. 3 mm diameter. Fruit cylindrical, slightly curved, 1.7–2.5 cm long, dehiscing from apex, hairy. Seeds ellipsoid, 1.5 mm long, with narrow wings on three sides.

Based on Flora of China account.

Flowers: April to May.

Fruits: August to September.

Distribution

  • China – Anhui, Fujian, Guangdong, Guangxi, Guizhou, Hubei, Hunan, Jiangxi, Sichuan, Zhejiang

RHS Hardiness Rating: H5

Taller, to 20 ft. Leaves downy beneath all over the blade, longer-stalked. Corolla tubular at the base, pale pink. Ovary densely downy. Introduced by Wilson from W. Hupeh, China, in 1908, but uncommon in this country.

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