160 



XIII. CRUCIFERiE. 



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

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

 with seeds attached. e.Cross section of a seed, cotyledons conduplicate (0»). 7. Flower (enlarged)^and leaf 

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

 cotyledons incumbenKO H). 11. Section of a winged seed of Arabis Canadensis, cotyledons accumbentoll. 



Conspectus of the Genera. 

 * Ornamental exotics not culinary.' 



W 



fSilicle 5 Some of the stamens toothed. . . Alysnim. 8 



< 2-celled . \ Stamens all toothless Lunaria. 9 



^ Petals equal. ( Silicle 1-celled, l-.seeded Isatis. 11 



Fruit siliculose ; i Petals unequal, the 2 outer ones larger Iberis. 10 



^ Stisma capitate Cheiranthus. 21 



< Seeds flat(0=). ^Stigmas cornute Matthiola. 22 



^ Seeds ovoid (Oil). Caly.\ furrowed at base Hesperis. 18 



Fruit siliquose ; 



Plants native or naturalized, and culinary exotics. 



( Silicle 



Flowers 

 cyanic. 



^ 4— co-seeded- 

 f ovate and ^emarginate, ^2-seeded 

 I compressed, I entire at the apex. 

 ^ Gvoid or ^Leaves cauline. 

 j globose. I Leaves radical, 



triangular, cuneate at base 



< jointless. 



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



C Valves 

 J A'einless. 



Sds. not <0=. 

 bordered, ^Ofl. 

 <v Pods linear. ( Seeds bordered. 

 I Pods lanceolate. Leaves few 



^ wingless 



winged on the margin. . 



Thlaspi. 



Lepidium. 



Draba. 



Cochlearia. 



Subularia. 



Capsella. 



Cakile. 



Cardamine. 



Sisymbrivm. 



Cheiranthus. 21 

 17 

 12 

 14 

 15 

 26 

 C4 



("Seeds in a 



1 single row. \ Pods lanceolate. Leaves few. . Dentaria 



\ Seeds in a S wingless Nasturtium. 



Idoublerow, ( winged on the margin. . . . Turritis. 



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



.siliquose. (.Valves 0. Silique indehiscent, transversely celled. . . . Raphanus. 



{ Pods dehiscent. . Brassica. 



( fflobose. I Pods indehiscent. . Raphanus. 26 



ff Seeds in a -^ oblong (0=). Leaves lyrate. . Barbarea. 13 



Calyx erect < single row, (oblong (Oil). Leaves undivided. Erysimum. 20 



or closed. ( Seeds in a double row Turritis. 14 



4 Seeds ovoid or oblong (on). . . Sisymbrium. 19 



Calyx spreading. • . ^ Seeds globose (0»). . . . Binapis. 23 



Flowers'^, ^ oblong or somewhat terete Nastttrtium. 12 



yellow, l Fruit siliculose, . . ?. obovoid or subglobose Camelina. 7 



Section I. SILICULOSJE. ((i 80, note.) 



1. THLASPI. Dill. 



Gr. Q\ao}, to compress ; on account of the compressed or flattened silicles. 



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

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

 back; cotyledons accumbent (o=). — Lvs. undivided. F Is. white. 

 1, T. ARVENSK. Pcnm/ Cress. 



I/vs. oblong, coarsely dentate, smooth; sz'Zicferoundish-obovate, shorter than 

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

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

 the cauline slightly arrow-shaped with small obtuse auricles, wavy and toothed 



