Sisymbrella aspera, (L.) Spach

2. S. aspera (L.) Spach , /Zwt. Vég. (Phan.) 6: 426 (1838)

( Nasturtium asperum (L.) Boiss. ).

Stems smooth or scabrid with white tubercles. Leaves pectinate-pinnatisect. Petals yellow. Siliqua 15-40 mm; pedicels long or short. Seeds in 1 or 2 rows in each loculus. S. W. Europe. G a Hs Lu.

The various characters used to recognize this species appear in different combinations, but can be used to give a fairly good pattern of geographical subspecific differentiation.

1 Seeds in 1 row in each loculus (d) subsp. pseudoboissieri 1 Seeds in 2 rows in each loculus

2 Petals 7-12 mm; pedicels (8—)10—12(—15) mm; siliqua 25-

45 mm (c) subsp. boissieri 2 Petals 3-7 mm; pedicels 3—8(—10) mm; siliqua 15—25(—30) mm

3 Siliqua 15-20(-26) x 2-2-5 mm, relatively thick and short, narrowing from below the middle to the apex, + scabrid

as are the stems (a) subsp. aspera

3 Siliqua 25-30x 1-7 mm, ± linear, slightly attenuate at the apex, almost entirely smooth (b) subsp. praeterita