Potentina collina, Wibel

22. P. collina Wibel , Prim. FI. Werthem. 267 (1799).

Procumbent to erect perennial. Flowering stems up to 30(^40) cm, terminal or lateral, glabrous to white-tomentose. Leaves digitate; leaflets 5-7, oblong-obovate or oblanceolate, variously toothed or incised, sparsely pubescent to white-tomentose or sericeous beneath. Flowers few to numerous. Sepals ovate; epicalyxsegments linear or linear-lanceolate, usually as long as or shorter than sepals. Petals 4-7 mm, yellow, as long as or longer than sepals. Style conical at base, slightly davate at apex, but often somewhat distorted. 2/7 = 42. C. Europe, extending to N. Italy, C. France, S. Sweden and the S. & W. parts o f the U.S.S.R. Au?Be Bu Cz Da Ga Ge He Hu It?Ju Po Rm Rs (B, C, W, K, E) Su.

As defined here this species is composed of a wide range of plants which are intermediate between the P. argentea group and 40-51. Some are known to be apomictic and are probably of hybrid origin. It is sometimes very difficult to decide whether an individual should be referred to P. collina or to one of the putative parent species. 22 contains at least 12 taxa that have been described as species and are often recognized as such in Europe. Those most closely resembling the P. argentea group are:

P. johanniniana Goiran , Spec. Morph. Veg. 45 (1875). It.

P. sordida Fries ex Aspegren , Förs. Blek. FI. 38 (1823). Bu Cz Ga Ge.

P. collina sensu stricto ( P. wibeliana T. Wolf ). Au Cz Ga Ge Hu Rm Rs (C). Those most closely resembling 40-51 are:

P. alpicola De la Soie ex Fauconnet , Bull. Trav. Soc. Murith. 5: 18 (1876). He It.

P. opizii Domin , Sitz.-Ber. Böhm. Ges. Wiss. (Math.-Nat. Kl.) 1903(25): 21 (1904). Cz.

P. rhenana P. J. Mueller ex Zimmeter , Gatt. Potent. 12 (1884). Ge. The following are more or less intermediate:

P. argenteiformis Kauffm. , Mosk. FI. 159 (1866). Rs (E).

P. leucopolitana P. J. Mueller in Billot, Annot. 278 (1862). Au Cz Da Ga Ge Hu Po Rm Rs (C, W).

P. praecox F. W. Schultz , Pollichia 16-17: 5 (1859). Ge He.

P. silesiaca Uechtr. , Jahresb. Schles. Ges. Vaterl. Cult. 44: 82 (1867).?Ge Po.

P. thyrsiflora Zimmeter in A. Kerner, Sched. FI. Exsicc. Austro-Hung. 2: 21 (1882). Cz Ge Hu It Po Rm Rs (C, W).

P. wiemanniana Günther & Schummel , Sched. Cent. Siles. Exsicc. 5 (1813). Au Cz Da Ga Ge He Hu It Ju Rs (B, C, W, E) Su.