NATUEAL ORDERS. 



251 



Fig. 176. 



ont stipules. Floiuers in racemes or corymbs. Sepals 4, de- 

 ciduous. Petals 4, alternating with tlie 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 silicic. Seeds attached by a funiculus 

 to each side of the placentae, generally j^endulous, without 

 albumen ; emhryo with the cotyledons folded on the radicle. 



a. Properties : acrid, stimulant. 



Genera. — SiliculosvE — Cochlearia, Alyssum, Lunaria, Draba, Thlaspi, Iberis, 

 Cakile, Isatis, Camelina, Subularia, Lepidium, Coronopus, Platyspetalum, Platy- 

 spermum, Crambe, Brassica, Vesicaria, Thysanocarpus. SiliquoSuE — Cheiranthus, 

 Barbarea, Arabis, Cardamine, Dentaria, Nasturtium, Turrit is, Phoenicaulis, Erysi- 

 mum, Hesperis, Sysimbrium, Warea, Raphanus, Sinapis. 



Fig. 176, a, loDASTiivs Jicsperidoides ; b,a. 

 petal enlarged ; c, stamens and pistil en- 

 larged ; d, part of a silique enlarged with 

 a portion of the valves cut away. 



412. Capparidace^, t7ie Ca- 

 pcrTrihe. — Ilerhs^ and sometimes 

 shrubs or trees. Leaves alternate, 

 petioled, undivided or palmate. • 

 Sepals 4-7, more or less cohering 

 at the base. Petals 4r-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 1-cell- 

 ed pod. Seeds curved or reni- 

 form, destitute of albumen ; em- 

 bryo curved. 



a. Properties : the roots and herbage, or 

 bark are bitter, nauseous, and sometimes 

 poisonous. 



Genera. — Cleonie, Gynandropsis, Polani- 

 sia, Isomeris. 



413. KESEDACEiE, the Mignonette Tribe. — Herbaceous plants 

 (rarely ^ shrubs), with a watery juice. Leaves alternate, with 

 gland-like stipules. Flowers in terminal racemes, often fra- 

 gTant. Calyx l-T-parted. Petals 2-7, unequal, lacerated, with 

 broad, nectariferous claws. Stamens definite, inserted into the 

 disk. Ovary sessile, 3-lobed, with 3-G parietal placenta ; stig- 

 mas 3. Fruit a 1-celled pod. Seeds several, exalbuminous ; 

 embryo curved. 



Genus. — Reseda. 



414. VioLACE/E, the Violet T?-ibe.— Herbs, sometimes slrtfbs. 



