Filipendula ulmaria, (L.) Maxim.

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1981, Flora Europaea. Volume 2. Rosaceae to Umbelliferae, Cambridge University Press : 6

2. F. ulmaria (L.) Maxim. , Acta Horti Petrop. 6(1): 251 (1879)

( Spiraea ulmaria L. ).

Pubescent to tomentose; stems 50-200 cm, simple or branched, leafy; roots not tuberous. Basal leaves with up to 5 pairs of large leaflets; large leaflets 2-8 cm, ovate-oblong to ovate-suborbicular, variously toothed or shallowly lobed. Inflorescence 5-25 cm, usually longer than wide. Petals 5(-6), 2-5 mm; stamens exceeding petals. Achenes c. 2 mm, spirally twisted. 2n=14, 16, 24. Throughout Europe except some o f the islands and much o f the Mediterranean region. All except Az BI Co Cr Rs (K) Sa Sb Si Tu.

Variable in the indumentum and toothing of the leaflets. The following subspecies appear to be reasonably distinct.

1 Leaflets green with sparse, long, straight hairs beneath (c) Subsp. denudata

1 Leaflets with crispate hairs and usually white-tomentose beneath

2 Leaflets crenate-serrulate to shallowly biserrate; achenes glabrous (a) Subsp. ulmaria

2 Leaflets deeply biserrate or shallowly lobed with serrate lobes; achenes pubescent (b) Subsp. picbaueri