Erysimum Erysimum, Jav., Jav.Erysimum Erysimum, Boiss. & Heldr.

12. E. rechingeri Jâv. , Ann. Naturh. Mus. (Wien) 43: 296 (1929).

Very like 11 (a) but the base of the stem thick, long, woody; petals 15-16 mm; siliqua 35-90 x 1-2-1-6 mm, patent. Cliffs. • Limnos. Gr. Possibly only a subspecies of 12.

13. E. mutabile Boiss. & Heldr. in Boiss., Diagn. Pl. Or. Nov. 2 (8): 24 (1849).

Caespitose perennial with usually procumbent stems not more than 12 cm; hairs mostly medifixed. Basal leaves up to 20 x 4 mm, with petiole up to 5 cm, oblong-spathulate, green. Pedicels 1-2 mm in flower, up to 3 mm in fruit. Sepals 4-6 mm, slightly saccate at base; petals 7-11 x 1-5-3-5 mm, yellow, buff or purplish and pubescent on the back; anthers c. 1-5 mm. Siliqua 10-20 mm; style (l-5-)2-4m m. Cliffs and rocks above 1000 m. • Kriti. Cr.

14. E. diffusum Ehrh. , Beitr. Naturk. 7: 157 (1792)

( E. canescens Roth ).

Biennial or short-lived perennial up to 120 cm; hairs medifixed. Basal leaves 1-8 mm wide, filiform to linearlanceolate, entire or denticulate, green or grey. Pedicels 1-6 mm in flower, up to 9 mm in fruit. Sepals 5-7-5(-9) mm, not or slightly saccate at base; petals 8—14(—17) x 2-5-4 mm, pubescent on the back; anthers 2-3 mm. Siliqua (2O-)35-8O x 0-6-1 mm, square in cross-section, erect or erecto-patent, green, or grey with green angles; style 0-5-1-5 mm. Seeds 1-1-5 mm. 2n = c. 32. Dry places. C. & S.E. Europe, extending to Italy. Al Au Bu Cz G r H u It Ju Po Rm Rs (C, W, K, E)?Si Tu. Sometimes confused with 19. (15-20). E. leptostylum group. Biennial or short-lived perennial; hairs medifixed or stellate, or both, always with at least some stellate hairs on the siliqua. Basal leaves oblong or oblonglanceolate, sinuate-dentate to -pinnatifid. Pedicels 1-6 mm in flower, up to 8(—10) mm in fruit. Sepals usually only slightly saccate at base; petal-limb 2-5 mm wide, pubescent on back; anthers 2-3-5 mm. Style of siliqua 0-5~2(-4-5) mm.

Taxonomically a very confused group. Within the group there is much variation in characters which have traditionally been used to delimit sections and other major divisions in the genus (e.g. hair-type, shape of the siliqua). With the material available it has not yet been possible to reassess critically the value of these characters, so that the treatment here is very tentative. In addition to the species included, 14 and 21 are also very like the group, and have often been confused with members of it.

1 Siliqua patent

2 Hairs on siliqua mostly medifixed 17. graecum 2 Hairs on siliqua mostly stellate 18. smyrnaeum 1 Siliqua erect or erecto-patent

3 Siliqua strongly dorsally compressed; seeds 1-3-2 mm

4Siliqua 60-100 mm 15. olympicum 4 Siliqua 30-60 mm 16. calycinum 3 Siliqua square or circular in cross-section; seeds 1-1-5 mm

5 Sepals 5—7-5(—9) mm; petal-limb oblong-ovate

19. crepidifolium 5 Sepals 7-9 mm; petal-limb orbicular-obovate 20. leptostylum