Syrenia A ndrz. Syrenia cana, (Piller & Mitterp.) Neilr.

19. Syrenia A ndrz. 1

Like Erysimum but the median nectaries absent; hairs on the siliqua usually medifixed, lying transversely across the siliqua; style at least | as long as the rest of the siliqua; seeds in 2 rows in each loculus.

1 Pedicels 3-5 mm in flower, up to 6 mm in fruit, about | as long as the calyx and siliqua 3. siliculosa

1 Pedicels 0-5—2(—2-5) mm in flower, up to 3(—5) mm in fruit, not more than f as long as the calyx and siliqua

2 Siliqua compressed laterally; valves narrowly winged on the back; style 6-12 mm, about as long as the siliqua

4. montana

2 Siliqua square in cross-section; valves keeled but not winged; style 3-7 mm, usually shorter than siliqua

3 Siliqua 5-20(-25) mm; pedicels not more than 2 mm; hairs medifixed 1. cana

3 Siliqua 15-40 mm; pedicels 2-5 mm; hairs medifixed and 3-fid 2. talijevii

1. S. cana (Piller & Mitterp.) Neilr. , Aufz. Nachtr. 73 (1870)

(5. angustifolia (Ehrh.) Reichenb. ).

Biennial 25-80 cm; hairs medifixed. Leaves linear, entire, grey or grey-green. Pedicels 0-5-2 mm. Sepals 6-10 mm, saccate at base; petals (10—)12— 22 x 3-6 mm, pale yellow, glabrous on back; anthers 2-3 mm. Siliqua 5-25(-30) x 1-5-4 mm, square in cross-section, white, with green angles; valves keeled; style 3-5-7 mm. Seeds 1- 1-8 mm. Sandy soils. E. & E.C. Europe, from Czechoslovakia and Jugoslavia to S. Russia.?Bu Cz Hu Ju Rm Rs (C, W, K, E).