160 



• 1 



XIII. CRUCIFERiE. 





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

 flower— stamens in 2 rows, outer row half wanting. 4. A silinue,— 5, partly open, showing the septuni 

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

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

 cotyledons incumbent (0 D). U. Section ofa winged seed of Arabis Canadensis, cotyledons accumbent il. 



Conspectus of the Gericra. 

 * Ornamental exotics not culinary.' 



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

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

 k Stigma capitate. 



i Seeds flat(0= ). I Stigmas cornute. 

 Fruit siliquose ; ( Seeds ovoid <0'i). Caiy.x furrowed at base. 



( Silicle S Some of the stamens toothed. 



< 2-celled . ( Stamens all toothless Lunaria. 



Alysstmu 



Isatis. 



Iberia. 10 



Cheiranthua. 21 



Matthiola. 22 



Hesperis. 18 



** Plants native or naturalized, and culinary exotics. 



< 4— co-seeded 

 f ovate and ^ emarginate, ( 2-seeded. 

 I compressed, (entire at the apex. 

 < ovoid or ^ Leaves cauline. 



(Silicle globose. ^Leaves 



^Fruit <jointles8, L triangular, cuneate at base. .. 

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



Thlarpi. 

 Lepidium. 

 Draba. 

 Cochlearia. 

 i Leaves radical. .... Suhularia. 



Capsella. 

 Cakile. 

 Cardamine. 

 Fisyynbriv/m. 



< bordered, ?on. 

 ^ Pods linear. ( Seeds bordered. 



1 

 3 

 4 

 5 

 6 

 2 

 25 

 16 

 19 

 Cheiranthus. 21 

 17 

 12 

 14 

 15 



("Seeds in a 



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



(Valves 1 Seeds in a ^ wingless Nasturtium. 



veinless. . I double row, ^ winged on the margin. . . . Turritis. 



Valves with one central vein, flat, linear Arabis. 



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



^ Pods dehiscent. . Brassica. 



( globose. I Pods indehiscent. . Baphanus. 



(Seeds in a < oblong (0=). Leaves lyrate. . Barbarea. 



{Caly.x erect -j single row, ( oblong (on ). Leaves undivided. Erysimum. 



or closed. ( Seeds in a double row Turritis. 



^ Seeds ovoid or oblong (on). . . Sisymbrium. 



Calyx spreading. • . ( Seeds globose (0>>). . . . Sinapis. 



Flowers"! ^ oblong or somewhat terete Nasturtium. 



yellow. I Fruit siliculose, . . ; obovoid or subglobo.se Camelina. 



Section I. SIL.lCUI.OSiE. (§ 80, note.) 



1. THLASPI. Dill. 

 Gr. i^Xacj, 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 ; valyes carinate, often winged on the 

 back; cotyledons accumbent (o=). — Lvs. undivided. Fls. vjhite. 



1. T. ARVEN'.sE. Penny Cress. 



Lvs. oblong, coarsely dentate, smooth; silicle round ish-obovate, shorter than 

 the pedicel ; stig. subscssile. — 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 



