NATURAL OKDEKS. 
251 
out stipules. Flowers in racemes or corymbs. Sepals 4, de- 
ciduous. Petals 4, alternating with the sepals,their spreading 
limbs forming a cross. Stamens 6, tetradynamous. Ovary 
superior, with parietal placentae meeting in the middle and 
forming a false dissepiment ; stigmas 2, opposite the placen- 
tae. Fruit a silique, or silicle. Seeds attached by a funiculus 
to each side of the placentae, generally pendulous, without 
albumen ; embryo with the cotyledons folded on the radicle. 
a. Properties : acrid, stimulant. 
Genera. — Siliculos^ — Cochlearia, Alyssum, Lunaria, Draba, Thlaspi, Ibens, 
Cakile, Isatis, Camelina, Subularia, Lepidium, Coronopus, Platyspetalum, Platy 
spermum, Crambe, Brassica, Vesicaria, Thysanocarpus. Siliquos^ — Cheiranthu^ 
Barbarea, Arabis, Cardamine, Dentaria, Nasturtium, Turritis, Phoenicaulis, Erysi- 
mum, Hesperis, Sysimbrium, Warea, Raphanus, Sinapis. 
Fig. 176, a, loD M!iTa.m hesperidoides ; b,SL 
{)etal enlarged ; c, stamens and pistil en- 
arged ; d, part of a silique enlarged with 
a portion of the valves cut away. 
412. Capparidace^, the Ca- 
per Trihe. — Herbs ^ and sometimes 
shrubs or trees. Leaves alternate, 
petioled, undivided or palmate. 
Sepals 4-Y, more or less cohering 
at the base. Petals 4-7, unequal, 
usually unguiculate. Stamens 
seldom tetradynamous, usually 
some high multiple of 4. Ovary 
stalked or sessile, 1-celled, with 
two or more parietal placentae; 
ovules numerous. Fruit a l-cell- 
ed pod. Seeds curved or reni^ 
form, destitute of albumen ; errh- 
bryo curved. 
a. Properties : the roots and herbage, or 
bark are bitter, nauseous, and sometimes 
poisonous. 
Genera. — Cleome, Gynandropsis, Poland 
sia, Isomeris. 
413. Eesedace^, the Mignonette Tribe.- — 'Herbaceous plants 
(rarely ^ shrubs), with a watery juice. Leaves alternate, with 
gland-like stipules. Flowers in terminal racemes, often fra- 
grant. Calyx 4-7-parted. Petals 2-7, unequal, lacerated, witli 
broad, nectariferous claws. Stamens definite, inserted into the 
disk. Ovary sessile, 3-lobed, with 3-6 parietal placentae ; sthg- 
V7.as 3. Fruit a 1-celled pod. Seeds several, exalbuminous ; 
embryo curved. 
Gknus. — Reseda, 
414. YioLACEJ5, the Violet Tribe. — Herbs^ sometimes shruh. 
