ORDER 13—THE CRUCIFERS. 165 
1 A. Ludovicia’na. Louisiana R. All the leaves feather-cleft. Seeds vor- 
dered. Plant slender, 6-10’ high. S. dfar., Apr. 
2 A. lyra’ta. Lyre-leaved R. Only the root leaves feather-cleft. Seeds not 
bordered. Plant 6-12’ Ligh. Pods 14-2’ long: 
8 A. Thalia’na. Mouse-ear A. Stems erect. Leaves nearly entire. Petals twice 
longer than the sepals. Podserect. Plant downy. May. 
4 A.denta’ta. Toothed R. Stems diffuse. Leaves sharply toothed. Petals scarce 
longer than sepals. Pods spreading. Rough. M. W. 
5 A.patens, Patent R. Downy. Pods spreading and curved upwards, beaked 
with a distinct style. w. W.38. 
6 A. hirsu’ta. Hairy R. Plant hairy. Siliques straight, erect. Style none. 
Leaves arrow-shaped. Fils. g. 
7 A. leviga’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’RIA. 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 2. Rhizoma prostrate, jointed. Stem leaves but 2 or 
8. Flowers white or purplish. 
{ Stem leaves almost opposite or whorled... 1, 2,8 
{ Stem leaves alternate or scattered. Root-stock moniliform....4, 5 
1D. diphyl/la. TZvwo-leaved P. Stem leaves 2 only, leaflets 3, ovate, toothed. 
2D. lacinia’ta. Cut-leaved P. Stem leaves 8, leaflets 3-5, linear, cleft. 
8 D. multif/ida. Stem leaves 2-3, numerously divided into linear leaflets. 5S. 
4D, max’ima. Leaflets 8, ovate, cut and cleft. Lvs. 3-7. Fls. purple. M. 
5 D. heterophyl/la. Lfits. 8, nearly entire; of the rt. lvs. 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....1, 2 
* Leaves simple or partly ternate. Mostly perennials....a 
a Style slender. In low, wet grounds.... 
a Style none. In high mountains.... 
1 Ghirsu’ta. Pennsylvanian C. Smooth, about if. erect. Leaves 5-11-foliate, the 
terminal lobe largest, 3-lobed. Stigmasessile. Wet. @ c. 
2 ©, peaten’sis. Cuckoo-flower. Stem simple, ascending, 1f. Leaves 7-15-foliate, 
with stalked, roundish leaflets. Style present. Flowers large. Wet. % 
