160 



Xm. CRUClFERiE. 



5f 4 



FIG 40 —1 A flower of Sinapia nigra. 2. The stamens (4 long and 2 short) and pistil. 3. Plan of the 

 nower —stamens in 2 rows, outer row half wanting. 4. A silique— 5, partly open, showing the septum 

 with seeds attached. e.Cross section ofa seed, cotyledons conduplicate (0>>). 7. Flower (enlarged) and leaf 

 of Capsella 8 A silicle,— 9, open, showing the narrow septum with seeds. 10. Cross section of a seed, 

 cotyledons incumbent (0 U). 11. Section of a winged seed of Arabia Canadensis, cotyledons accumbent II. 



Conspectus of the Genera. 



* Ornamental exotics not culinary.' 



(Silicle (Some of the stamens toothed. 

 < 2-celled . ( Stamens all toothless. 

 ( Petals equal. ( Silicic Icelled, 1-seeded. 

 Fruit siliculose ; { Petals unequal, the 2 outer ones larger. 



Fruit siliquose ; 



. Alijsntm. 8 



. Lunar ia. 9 



. Isatis. 1 1 



^_.. . , . Iberis. 10 



(Stigma capitate. ° Cheiranthus. 2i 



( Seeds flat(0=). {Stigmas comute Mat!Mo!a. 22 



j Seeds ovoid <on). Caiy.\ furrowed at base Ilesperis. 18 



** Plants native or naturalized, and culinary exotics. 



( Silicle 



Flowers 

 cyanic. 



( 4— OO-seeded. 

 (■ ovate and (emarginate, <2-seeded. 

 I compressed, {entire at the apex. 

 < ovoid or (Leaves caul ine. 



globose. c Leaves radical. 



{. triangular, cuneate at base. 



. < jointless. ---„-, 



siliculose. ( Silicle with 2 joir.ts, upper joint ovate or ensiform 



Sds. not (o=. 

 ^ bordered, lon . 

 ( Pods linear, f Seeds bordered. 

 i Pods lanceolate. Leaves few 



(■Seeds in a 

 1 single row. 

 ("Valves 1 Seeds in a ,...„^.^<,^. . 



1 veinless. . I double row, ( winged on the margin. 

 Fruit ) Valves with one central vein, flat, linear. 



Isiliquose. I Valves 0. Silique indehiscent, transversely celled. 



( Pods dehiscent. 

 ( globose. l Pods indehiscent. 

 f Seeds in a < oblong (0=). Leaves lyrale. 

 fCalyx erect < single row, ( oblong (oil ). Leaves undivided. 



J or closed. ( Seeds in a double row Tvrritis. 



I (Seeds ovoid or oblong (0 II ). . . Sisymirhmi. 19 



I Calyx spreading. ■ . (Seedsglobo.se (0»). . . . Slnapis. 23 



(oblnng or somewhat terete h'nsturtivm. 



(■Fruit 

 1 siliquose 

 Flowers ; 



Thlnspi. 1 



Lepidium. 3 



Draba. 4 



Cochfearia. 5 



Subvlaria. fi 



Capsella. 2 



Cakile. S.5 



Cardamine. 16 



f^isymbrium. 19 



Cheiranthiis. 21 



Dentaria. 17 



Nasturtium. 12 



Tvrritis. . 14 



Arabis. 15 



Raphanvs. £6 



Brassica. S4 



}!nphanus. 26 



liarbnrea. 13 



Erysimum. 20 



r n^wcia I 



jellow. I Fruit siliculose, 



\ obovoid or subglobose Camelina. 



Section I. SII.ICULOS'iE. (^ 80, note.) 



1. THLASPI. Dill. 



Gr, (9Xao), to compress ; on account of the compres.sed or flattened silicles. 



Calyx equal at base; petals equal ; silicle short, flat, emarginate 

 at the apex, Biany-seeded ; valves carinate, often winged on the 

 back; cotyledons accumbent (0 = ). — Lvs. undivided. Fls. tvhite. 



1. T. ARVENSE. Pctmy Cress. 



Lais, oblong, coarsely dentate, smooth; silicle roundish-obovate, shorter than 

 the pedicel ; stig. subsessile. — In cultivated, stony fields,Can. and Northern Stales. 

 The -whole plant smooth, 8 — 12' high, branched. Leaves 1 — 2' long, J as wide, 

 the cauline slightly arro-w-shaped with .small obtuse auricles, wavy and toothed 



