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FOC | Family List | FOC Vol. 9 | Rosaceae | Spiraea

2. Spiraea japonica Linnaeus f., Suppl. Pl. 262. 1782.

粉花绣线菊 fen hua xiu xian ju

Shrubs erect, to 1.5 m tall. Branchlets brownish to purple-brown, slender, subterete, glabrous or pubescent when young; buds ovoid, 3–5 mm, with several scales, puberulous, apex acute. Petiole 1–3 mm, pubescent; leaf blade abaxially paler or glaucous pruinose, adaxially dark green, ovate or ovate-elliptic to lanceolate or oblong-lanceolate, 2–16 × 1–4 cm, abaxially usually pubescent on veins, adaxially glabrous or puberulous on veins, base cuneate to rounded, margin crenate to doubly serrate, rarely singly serrate, apex obtuse or acute to acuminate. Corymbs terminal on erect, long, leafy shoots of current year, compound, 6–14 × 2.5–14 cm, many flowered; rachis and pedicels densely pubescent; pedicels 4–6 mm; bracts lanceolate to linear-lanceolate, sometimes to 1 cm, abaxially puberulous. Flowers 4–7 mm. Hypanthium campanulate, sparsely pubescent abaxially. Sepals triangular, 1.5–2 mm, erect in fruit, apex acute. Petals usually pink, sometimes white, ovate to orbicular, 2.5–3.5 × 2–3 mm, apex obtuse. Stamens 25–30, much longer than petals. Disk annular, irregularly crenulate. Follicles divergent, glabrous or pilose on adaxial suture; styles ascending. Fl. Jun–Jul, fr. Aug–Sep.

Forests, forested slopes, forest clearings, thickets, grassy slopes, mountain valleys, gullies, river banks, alpine steppes, rocky and stony places also commonly cultivated; 700--4000 m. Anhui, Fujian, Gansu, Guangdong, Guangxi, Guizhou, Henan, Hubei, Hunan, Jiangsu, Jiangxi, Shaanxi, Shandong, Sichuan, Xizang, Yunnan, Zhejiang [Japan, Korea].

Eight varieties may be recognized in China. In addition, Spiraea japonica var. stellaris Rehder (in Sargent, Pl. Wilson. 1: 452. 1913) was described on the basis of a fruiting specimen (A. Henry 9280) from SE Yunnan (Mengzi Xian).


1 Leaf blades glabrous on both surfaces.   (2)
+ Leaf blades pubescent abaxially.   (4)
       
2 (1) Inflorescences glabrous.   2h var. glabra
+ Inflorescences pubescent.   (3)
       
3 (2) Leaf blades elliptic or broadly ovate, 2–4 cm, margin crenulate to doubly serrate, apex obtuse or subacute; inflorescences 7–12 cm in diam.; flowers white.   2f var. ovalifolia
+ Leaf blades oblong-lanceolate, 5–10 cm, margin sharply doubly serrate, apex shortly acuminate; i nflorescences 4–8 cm in diam.; flowers pink.   2g var. fortunei
       
4 (1) Leaf blade apex acute.   (5)
+ Leaf blade apex acuminate.   (6)
       
5 (4) Leaf blades ovate to ovate-elliptic, base cuneate, margin incised doubly serrate, rarely singly serrate; inflorescences 4–14 cm in diam.   2a var. japonica
+ Leaf blades ovate to elliptic, base broadly cuneate to rounded, margin distantly doubly serrate; inflorescences 2.5–4 cm in diam.   2b var. acuta
       
6 (4) Leaf blade margin not pinnatifid, sharply doubly serrate.   2c var. acuminata
+ Leaf blade margin incised pinnatifid and doubly serrate.   (7)
       
7 (6) Leaf blades ovate-oblong to oblong-lanceolate, 6–9 × 1–3 cm, base broadly cuneate to rounded; inflorescences 5–7 cm in diam.   2d var. incisa
+ Leaf blades oblong-lanceolate, 13–16 × 3–4 cm, base cuneate; inflorescences 7–14 cm in diam.   2e var. pinnatifida

Lower Taxa


 

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