OKDER 13. THE CRUCIFERS. 1C? 



1 A Ludovicia'na. Louisiana R. All the leaves feather-cleft. Seeds bor- 



dered. Plant slender, 6-10' high. S. Mar., Apr. 



2 A. lyra'ta. Lyre-leaved R. Only the root leaves feather-cleft. Seeds not 



bordered. Plant 6-12' high. Pods 1J-2' long. 

 8 A. Thalia'na. Mouse-ear R. Steins erect. Leaves nearly entire. Petals twice 



longer than the sepals. Pods erect. Plant downy. May. 

 I A denta'ta. Toothed R. Steins diffuse. Leaves sharply toothed. Petals scarce 



Jonflier thtki sepals. Pods spreading. Rough. M. W. 



5 A. patens. Patent R. Downy. Pods spreading and curved upwards, beaked 



with a distinct style, w. W. S. 



6 A. hirsu'ta. Hairy R. Plant hairy. Siliques straight, erect. Style none. 



Leaves arrow-shaped. Fls. g. 



7 A. laeviga'ta. Smooth Sickle-pod. Stem leaves arrow-shaped, clasping, narrow. 



Pod spreading. Plant glabrous, 2f. high. 



8 A. Canaden'sis. True Sickle-pod. Stem leaves pointed at both ends, sessile. Pod 



curved, pendulous. Tall, downy. 



8. DENTA'EIA. Tooth-root. Pepper-root 



Sepals converging or closed. Silique lanceolate, with flat, veinless 

 valves opening elastically. Seeds in a single row in each cell, ovate, not 

 bordered. Plants U . Rhizoma prostrate, jointed. Stem leaves but 2 or 

 3. Flowers white or purplish. 



If Stem leaves almost opposite or whorled... ], 2, 8 



U Stem leaves alternate or scattered. Koot-stock moniliform. . . .4, 5 



1 D. diphyl'la. Two-leaved P. Stem leaves 2 only, leaflets 3, ovate, toothed. . 



2 D. lacinia'ta. Cut-leaved P. Stem leaves 3, leaflets 3-5, linear, cleft. 



3 D. multif'ida. Stem leaves 2-3, numerously divided into linear leaflets. S. 



4 D. max'ima. Leaflets 3, ovate, cut and cleft. Lvs. 3-7. Fls. purple. M. 



5 D. heterophyl'la. Lflts. 3, nearly entire ; of the rt. Ivs. round-ovate, toothed 



9. CARDAMI'NE. Bitter Cress. 



Calyx a little spreading. Silique linear, with flat, veinless valves which 

 are narrower than the partition. Stigma entire. Seeds not margined, 

 with a slender seed-stalk. Flowers white or purple. 



* Leaves pinnate with many leaflets. April-June....], 2 



* Leaves simple or partly ternate. Mostly perennials.... a 



a Style slender. In low, wet grounds. . . . 

 a Style none. In high mountains 



1 C. hirsu'ta. Pennsylvanian 0. Smooth, about If. erect. Leaves 5-11-foliato, th 



terminal lobe largest, 3-lobed. Stigma sessile. Wet. @ c. 



2 O. praten'sis. Cuckoo- flowtr. Stem simple, ascending, If. Leaves 7-15-foliate, 



with stalked, roundish leaflets Style present. Flowers large. Wet. V 



