MACLOSKIE I CRUCIFER^G. 423 



/3. Embryo with lateral radicle. Fruit dehiscent, its valves with the mid- 

 vein obsolete- Median honey-glands present or not. 



gi. Valves convex. Fruit globular to linear. Seeds minute, round, 

 2-seriate. Petals white or yellow, not cleft. 



11. Roripa (Nasturtium), p. 433. 

 g2. Valves flat (save impressions by seeds) ; finely reticulate ; elastically 



dehiscing. Seeds I -seriate, pendulous, mostly wingless. Stem 

 leafy, at least below. Petals white or pink (rarely none). 



12. Cardamine, p. 435. 



AA. Hairs all or some branched ; rarely unbranched or none. Sometimes also glandular hairs 



or gland-tubercles. 

 b\. Stigma equal all round, on the simple or prolonged or lobed style. 



ci. Silique linear, its values flat. Radicle dorsal. Petals pinnatifid, white or purple. 



13. Schizopetalum, p. 439. 



c 2. Silicle globular, septum as broad as the fruit Radicle lateral. Petals entire, yellow. 



14. Lesquerella(Vesicarid), p. 439. 

 b2. Stigmas stronger above the placentae ; style simple or more or less 2-lobed above the 



placentae. 



ci. Surface-cells of the septum not transversely divided. 

 d\. Surface-cells of septum without parallel partitions. 



ei. Fruit mostly short, a silicic; seeds several in its cells. Only lateral honey- 

 glands. Flowers small, white. 



/i. Valves carinate, with a strong mid-vein. Septum narrow. 

 g\. Silicle apically rounded or pointed. Radicle varying. 



15. Hutchinsia, p. 440. 



g2. Silicle distally broadened or indented and obcordate. Radicle lateral. 



1 6. Bursa (Capselld), p. 440. 



/2. Fruit oblong to linear, a rather flat silicic. Seeds 2-seriate, wingless. 

 Filaments winged or toothed. Petals white, sometimes yellow, entire 

 or cleft. 17. Draba, p. 441. 



e 2. Fruit mostly a long silicic or a silique ; style short, rarely depressed. Lat- 

 eral honey-glands uniting with a median into a ring (or no mid-gland), 

 /i. Fruit linear or lanceolate, with fibers in the septum. Seeds oblong, 

 wingless ; radicle dorsal. Leaves dissected. Petals yellow. 



1 8. Sophia (Descurainea), p. 447. 

 /2. Fruit linear, no fibers in the septum. Valves flat, with weak mid-vein, not 



elastically dehiscing. No gynophore. Seeds flat, winged or margin- 

 less. Radicle lateral. Petals white or yellow, entire. 



19. Arabis, p. 451. 



d2. Surface-cells of the septum with many parallel parti-walls, polygonally arranged 

 in special cells. Silicle pyriform to elliptic, or a I -seeded achene. Radicle 

 lateral. Honey glands lateral, or also with 2 mid-glands. Flowers racemose. 

 Petals yellow, entire. 



ei. Calyx open or erect, not saccate. Silicle more or less flat; its cells i -several 

 seeded, seeds wingless. 20. Alyssum, p. 451. 



