Geum L.

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 : 34-35

17. Geum L. 4

Perennial herbs. Leaves pinnate or lyrate. Flowers solitary or in cymose, bracteate inflorescences, usually 5-merous. Hypanthium saucer-shaped, sometimes with a central, davate carpophore; epicalyx present; petals more or less clawed, white, cream, yellow or red; stamens and carpels numerous; styles terminal. Fruit a head of achenes with long, persistent hairy styles, or with only the basal part of the style (rostrum) persistent.

Several hybrids are recorded. The most frequent and widespread is G. x intermedium Ehrh. , Beitr. Naturk. 6: 143 (1791) (5x9), which is fertile; segregates approaching one or other of the parents, as well as intermediates, are often found. G. x sudeticum Tausch , Hort. Canal. 1(1): t. [9] (1823) ( G. inclination Schleicher ex Gaudin & Monnard ) (2 x5) occurs in scattered localities, with the parents, in the Alps and the Carpathians and in Jugoslavia.

Literature: F. Bolle, Feddes Repert. (Beih.) 72: 1-119 (1933). W. Gajewski, Monogr. Bot. (Warszawa) 4: 1—416 (1957).

1 Style persistent in its entirety 2 Distal part of style covered with stiff, deflexed bristles; proximal part glabrous 4. heterocarpum 2 Whole of style covered with long, ascending, soft hairs 3 Plant with stolons; leaves pinnate 1. reptans 3 Plant without stolons; leaves lyrate 4 Flowers erect, golden yellow; inflorescence 1- to 3-flowered 2. montanum 4 Flowers nodding, pale yellow or whitish; inflorescence 3- to 7-flowered 3. bulgaricum 1 Distal part of style deciduous; proximal part (rostrum) persistent, hooked 5 Receptacle on a distinct carpophore 5-10 mm 6 Petals clawed, cream to pink 5. rivale 6 Petals not or scarcely clawed, yellow 6. sylvaticum 5 Receptacle ± sessile 7 Petals red 7. coccineum 7 Petals yellow 8 Petals usually not more than 8 mm 9 Stipules not more than 1 cm 13. hispidum 9 Stipules more than 1 cm 10 Achenes c. 250, forming an ovoid head 12. macrophyllum 10 Achenes c. 70, forming a globose head 9. urbanum 8 Petals usually more than 8 mm 11 Achenes 6-8 mm 8. pyrenaicum 11 Achenes less than 6 mm 12 Plant with a dense, soft pubescence 11. molle 12 Plant not densely hairy, or hairs stiff 10. aleppicum