Flora of North America species comparison

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Kerria japonica

corête du japon, Japanese- or Easter-rose, Japanese-rose
Stems

moderately flexuous.
Leaves

stipules 1.5–2.5 mm;

petiole channeled, 3–6(–9) mm;

blade bicolored, (2–)3–6(–8.5) × (1–)1.5–3(–3.7) cm, base broadly cuneate to subcordate, proximal margins finely gland-tipped serrulate, ± plicate between impressed veins, apex long-acuminate, hairs 0.3–0.5 mm.
Pedicels

5–22 mm, glabrous.
Flowers

sepal margins entire, scarious, sometimes serrulate or glandular-fimbriate, apex acuminate, surfaces glabrous;

petals (9–)17–25 × (2–)12–15 mm, claws 1–2 mm (innermost in multi-petaled cultivars showing transition toward stamens, 10 × 2–3 mm);

filaments erect-ascending, straight, yellow, slender, 4–5 mm, anthers yellow, 0.2–0.3 mm.
Nutlets

4–5 × 3.5–4 mm.
2n

= 18.

Kerria japonica
Phenology Flowering Mar–Jun; fruiting Jun–Aug.
Habitat Moist suburban forests and woodlands, roadsides
Elevation 0–700 m (0–2300 ft)
Distribution
from FNA
AL; CT; IL; MI; NC; NH; NY; OH; PA; RI; SC; TN; UT; VA; NS; ON; e Asia (China, Japan) [Introduced in North America; introduced also in Europe]
[WildflowerSearch map]
[BONAP county map]
Discussion

Kerria japonica is cultivated in central Europe and North America, particularly in the east, as a shade-tolerant ornamental shrub. The species persists long after cultivation and spreads mostly vegetatively, apparently only rarely spreading by seed. It is expected elsewhere. The cultivar 'Pleniflora' has multiple petals appearing as a yellow-orange rose.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 9, p. 390.
Parent taxa Rosaceae > subfam. Amygdaloideae > tribe Kerrieae > Kerria
Synonyms Rubus japonicus, Corchorus japonicus
Name authority (Linnaeus) de Candolle: Trans. Linn. Soc. London 12: 157. (1818)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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