Spiraea tomentosa, L. Spiraea decumbens, Koch Spiraea decumbens subsp. tomentosa, (Poech) Dostal Spiraea media, Franz Schmidt

4. S. tomentosa L. View in CoL , Sp. Pl. 489 (1753) View Cited Treatment .

Like 3 but leaves ovate to ovate-oblong, acute, unequally and often doubly serrate, yellowish or greyish tomentose beneath; panicle narrow; follicles pubescent, usually diverging. Locally naturalized from gardens in N. & C. Europe. [Cz Da Ge.] (£. North America.)

5. S. decumbens Koch View in CoL in Rohling, Deutschl. FI. ed. 3, 3: 433 (1831).

Stems c. 0-25 m, procumbent and ascending. Leaves up to 4 cm, oblong-obovate, cuneate and entire at the base, serrate or dentate towards theapex. Inflorescence corymbose; corymbs 3-5 cm wide, wider than long, many-flowered. Incompletely dioecious; flowers 5-7 mm in diameter; petals white, as long as or rarely shorter than stamens. Follicles glabrous. Calcareous rocks and screes. • S. E. Alps. Au It Ju.

(a) Subsp. decumbens :

Leaves acutely serrate, pale green and glabrous beneath. Pedicels and rhachis of inflorescence glabrous. 460-800 m. Mainly in the eastern part of the range.

(b) Subsp. tomentosa (Poech) Dostâl View in CoL , Feddes Repert. 79: 34 (1968)

(5. decumbens var. tomentosa Poech , S. hacquetii Fenzl & C. Koch ):

Leaves finely dentate, grey-tomentose beneath. Pedicels and rhachis of inflorescence tomentose. 600-1600 m. In the western part of the range.

6. S. japonica L. fil. View in CoL , Suppl. 262 (1781).

Up to 15 m., erect. Leaves up to 10 x 4 cm, ovate to oblong-lanceolate, cuneate at the base, acute, irregularly serrate, glaucous beneath and usually pubescent on the veins. Inflorescence corymbose; corymbs up to 12 cm wide; pedicels pubescent. Sepals deflexed; petals pink, shorter than stamens. Follicles glabrous. Locally naturalizedfrom gardens in C. Europe. [Au Cz Ge Hu It.] (Japan.)

7. S. corymbosa Rafin. View in CoL , Précis Découv. Somiol. 36 (1814).

Up to 1 m; branches erect or ascending, terete. Leaves c. 5 x 3 cm, ovate, rounded and entire at the base, obtuse or rounded and sharply serrate at the apex, glabrous. Inflorescence corymbose; corymbs 3-10 cm wide, somewhat convex. Sepals not deflexed; petals white or yellowish-white; stamens 3 times as long as petals. Follicles glabrous. Locally naturalized from gardens. [Cz.] (Eastern U.S.A.)

Subgen. Nothospiraea Zabel . Inflorescence a simple umbel or corymb, terminating a short shoot.

8. S. chamaedryfolia L. View in CoL , Sp. Pl. 489 (1753) View Cited Treatment

(S. ulmifolia Scop.). Up to 2 m, denselybranched; stems angular, brown, glabrous. Leaves up to 7 x 4 cm, ovate, ovate-lanceolate or rhombicelliptical, acute, entire at thebase, irregularly or doubly serrate towards the apex, glabrous. Inflorescence c. 4 cm, pedunculate, hemispherical, many-flowered; pedicels c. 10 mm. Sepals triangular-ovate, revolute; petals c. 6 mm, orbicular, shorter than stamens. Follicles glabrous, shining, with remains of style at apex. Low woodland and scrub. Carpathians, S.E. Alps, mountains ofBalkan peninsula. Au Bu Cz It Ju Rm Rs (W) [Ga Ge He].

9. S. media Franz Schmidt View in CoL , Östr. Allgem. Baumz. 1: 53 (1792)

( S' , oblongifolia Waldst. & Kit., S. chamaedryfolia L. pro parte).

Up to 1 -5 m, erect; stems terete. Leaves up to 5 x 2 cm, broadly elliptical, rounded at apex, glabrous when mature, sparsely hairy or grey-tomentose beneath when young; those of the nonflowering shoots with 6-8 teeth near apex, those of the flowering shoots entire. Inflorescence up to 4 cm, pedunculate, almost spherical, many-flowered. Sepals c. 1 mm, half as long as hypanthium, revolute; petals c. 3 mm, orbicular, white or pale yellow, as long as stamens or shorter. Follicles glabrous or thinly hairy, with remains of style on dorsal side. 2n = 10. Scrub on rocks. N. part of Balkan peninsula and S. C. Europe, extending eastwards to W. Ukraine; also in N. & E. Russia. Au Bu Cz Hu Ju Po Rm Rs (N, C, W, E).

(a) Subsp. media :

Inflorescence glabrous. Petals white, entire. Throughout the range ofthe species.

(b) Subsp. polonica (Blocki) Pawl. View in CoL , Feddes Repert. 79: 34 (1968)

(5. polonica Blocki ):

Inflorescence softly pubescent. Petals pale yellow, fimbriate. Poland.

The main area of distribution of this species is in E. Asia and Siberia, extending into the north and east parts of European Russia. It is separated by over 1300 km from the secondary area in C. Europe.