Oedbk 13.— the CEUCIFEES. ]65 



1 A. Lndovicia'na. Louisiana B. All the leaves feather-cleft.- Seeds hor- 



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



2 A. lyra'ta. I/yre-leawd B. Only the root leaves feather-cleft. Seeds not 



bordered. Plant 6-12' high. Pods U-2' long. 



3 A. Thalia'na. Mouse-ear B. Stems erect. Leaves nearly entire. Petals twice 



longer than the sepals. Pods erect. Plant downy. Maf/. 

 i A. denta'ta. Toothed B. Stems diffuse. Leaves shai-ply toothed. Petals scarce 

 longer than sepals. Pods spreading. Eough. M. W. 



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



with a distinct style, w. W. S. 



6 A. hirsu'ta. Sairy B. Plant hairy. ' Siliques straight, erect. Style none. 



Leaves arrow-shaped. Hs. g. 



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



Pod spreading. Plant glabrous, 2f high. 



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



curved, pendulous. Tall, dovrny. 



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 eacli cell, ovate, not 

 bordered. — Plants It. Ehizoma prostrate, jointed. Stem leaves but 2 or 

 3. Flowers white or purplish. 



If Stem leaves almost opposite or whorled ...1,2,3 



IT Stem leaves alternate or scattered. Eoot-stock moniliform. . . .4, 5 



1 D. diphyl'la. _ Two-leaved P. Stem leaves 2 only, leaflets 8, ovate, toothed.' ■ 



2 P. lacinia'ta. Out-leaved P. Stem leaves 3, leaflets 8-5, linear, cleft. 



8 i). multif'ida. Stem leaves 2-3, ntunerously divided into linear leaflets. S. 



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



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



9. OAKDAMI'NE. Bitter Cress. 



Oalyx a little sprestding. Silique linear, with flat, veinless valves which 

 are narrower th.an the partition. Stigma entire. Seeds not margined, 

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



* Leaves pinnate with many leaflets. Apnl-Jime 1, 2 



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



a Style slender. In low, wet groimds 



a Style none. In high mountains .... 



1 O. hirsu'ta. Pernisylvardan 0. Smooth, about If. erect. Leaves 5-11-foliate, the 



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



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



with stalked, roundish leaflets. Style present. Flowers large.- Wet. % 



