92 
FLORA OF ADEN. 
II. CRUCIFER/E. 
Herbs, sometimes shrubby, with colourless often pungent juice, 
glabrous, glaucous, or with simple mediofixed or stellate hairs. Leaves 
simple, alternate, exstipulate. 
Mowers racemose or corymbose at first, rarely bracteate. Sepals 4, 
deciduous, imbricate or valvate in the bud. Petals 4, stalked, arranged 
in the form of a cross, alternating with the sepals. Stamens tetradyna- 
mous. Ovary solitary, 2-locular by a spurious dissepiment extending 
across from the middle line of the two parietal placentas ; stigmas 2, 
sessile, opposite the placentas. 
Fruit a siliqua or silicula., usually 2-locular by the replum, from 
which the valves separate in dehiscence, leaving the placentas on a frame. 
Seeds generally pendulous in a single row on each placental margin ; 
embryo with the radicle variously folded on the cotyledons, without 
perisperm. 
Genera about 170; species about 1,200. 
Distribution : — All temperate and cold regions. A few genera are 
peculiar to the southern hemisphere 
Leaves linear, entire, with appressed mediofixed hair9 ... 1. Farsetia. 
Radical leaves lyrate or pinnatifid 2. Diplotaxis. 
1.— Farsetia Rosy. 
Branched herbs or undershrubs, often hoary with appressed hairs. 
Leaves linear or narrow, entire. 
Flowers spikate or racemose. Sepals erect, the lateral slightly saccate. 
Petals with long claws. 
Siliqua various in outline, from linear to orbicular, flat-compressed or 
turgid, with plane or convex, nerved or nerveless valves ; septum mem- 
branous, veined. Seeds compressed, often winged, in 1 or 2 series. 
Cotyledons accumbent. 
Species about 20. 
Distribution : — Southern Europe, North Africa, Asia Minor, Persia, 
Arabia, Socotra. 
1. Farsetia longisiliqua Bene. Ann. Sc. Nat. Ser. II. IV, 69 ; 
Walp. Repert. I, 139 ; Journ. Bull. Soc. Bot. Fr. XI, 56 ; Coss, Comp. 
FI. Atlant. II, 227 ; Oliv. FI. Trop. Afr. I, 62. 
Farsetia stylosa Anders. Journ. Linn. Soc. V, Suppl. p. }. 
