226 BOTANY 
ol 
Stem. Woody below and herbaceous above; erect, 
branched, ribbed; lower part covered with pale brown 
bark; upper portion coloured green, hairy. 
Leaves. Cauline, alternate (in five rows), sessile, 
lanceolate, acute, entire and reticulate-veined. Upper 
side dark green and slightly hairy; lower side pale 
green and more hairy; exstipulate. 
Inflorescence. Indefinite, raceme. 
Flowers. Complete, actinomorphic, cruciform, 
hypogynous. 
Calyx. Sepals four, in two whorls; aposepalous, 
inferior; lanceolate, hairy; two inner pouched at the 
base. (Notice glistening drop of nectar in pouch). 
Corolla. Petals four, apopetalous, hypogynous, 
clawed; usually reddish-brown in colour, scented. 
Andreecium, Stamens six, hypogynous, free, in two 
whorls, tetradynamous (%.e., In two sets—a single pair 
of opposite stamens, and two pairs opposite each other 
at right angles to these). The two short lateral stamens 
form the outer whorl; the four inner stamens are in two 
opposite pairs, anterior and posterior, each pair having 
arisen from the splitting of a single stamen. ‘The 
nectaries are small green glands situated on the 
receptacle at the bases of the short stamens; the 
nectar gathers in the pouches of the lateral sepals— 
filaments thick, anthers two lobed. 
Gynecium.—Carpels two, synearpous; style short; 
stigma two lobed; ovary superior, linear, spuriously 
two-celled, the septum or dividing wall being formed 
by ingrowths from the placentz; ovules numerous on 
two parietal placente. 
Fruit.—A siliqua (i.e., a two-eelled fruit formed 
from a superior ovary derived from two united earpels, 
and spuriously two celled by ingrowths from the 
the placentw). It dehisces by the earpels breaking 
away from the septum and leaving the ovules attached 
thereto. 
