CRUCIFERAE 241 



I. Siliquosae*. 



Capsule several times longer than broad, opening with 

 valves from below upwards: Matthiola, Nasturtium, Sisym- 

 brium, Brassica, Sinapis, Carponema, Heliophila (partly). 



II. Siliculosae. 



Fruit short and broad, dehiscing, or 1 -seeded and 

 indehiscent. Alysswn, Heliophila (partly), Lepidium, 

 Capsella, Se?iebiera, Brachycarpaea, Cycloptychis, Palm- 

 struckia, Schlechteria. 



III. Nucamentaceae. 



Fruit indehiscent, separating into several 1 -seeded 

 segments. Rapha7tus. 



KEY TO THE GENERA. 



A. Cotyledons flat. 



a. Edges of the cotyledons directed towards the radicle (accumbent) 



= . See Plate 64, D. 



I. Fruit subterete. 



1 . Two of the sepals saccate at base. 



1 S. A. species. C, No. 



Flor. Cap. 1, 20. 1. Matthiola R. Br. 



1. Sepals equal at base. (Plate 64, D.) 



1 endemic species and 1 cosmopolitan (water cress). 

 Flor. Cap. 1, 21. 2. Nasturtium (L.) R. Br. 



II. Fruit linear, the valves flat. 



1. Capsule linear-elongate, narrow. Valves not elastic. 



2 species in S. A. 



Flor. Cap. 1, 22 (incl. Turritis). 3. Arabis L. 



2. Capsule acute at each end. Valves dehiscing elastically. 



2 widely spread species in S. A., one C. africana. 

 Flor. Cap. 1, 23. 4. Cardamine (Tourn.) L. 



III. Fruit oval. 



1. Sepals not petaloid. 



2 species in S. A. Flor. Cap. 1, 23. 5. Alyssum [Tourn.) L. 

 1. Sepals petaloid. 



1 endemic species. Ca. 6. Schlechteria Bolus 



IV. Fruit 2-edged or 4-angled, with keeled valves. 



1 species, a weed. Flor. Cap. 1, 22. 7. Barbarea R. Br. 

 * Siliqua, the capsule of Cruci ferae, if it is dehiscent and longer than broad. 



SilicAila> dehiscent or indehiscent, but always at least as broad as long. 



31—2 



