Order 13.— THE CRUCIFEES. 1 f»5 



1 A. Ludovicia''na. Loiiiaiana R. All the leaves fenther-cleft. Seeds nor- 



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



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



bordered. Plant 6-12^ high. Pods '[\-2' long. 

 S A. Thalia'na. Mouse-ear E. Stems erect. Leaves nearly entire. Petals twice 



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

 A. A. denta''ta. Toothed E. Stems diffuse. Leaves sharply toothed. Petals scarce 



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



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



with a distinct style, w. W. S. 



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



Leaves arrow-shaped. Fls. g. 



7 A. laeviga'ta. Smooth Siclcle-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'KIA. Tooth-root. Pepper-root. 



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

 valves opening elasticallj. 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. 



T[ Stem leaves almost opposite or whorled. . . 1, 2, 3 



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



1 D. diphyl'la, Ttvo-leaved P. Stem leaves 2 only, leaflets 8, tDvate, toothed. 



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



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



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



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



9. CAPwDAMrNE. 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 0. hirsu'ta. Pennsijlvanian 0. Smooth, about If. erect. Leaves 5-11-foliate, the 



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



2 C. praten''sis. Cuckoo-flower. Stem simple, ascendinsr. If. Leaves 7-lo-foliate, 



with Btalked, roundish k'iitlel5. Style present. Flowers large. Wet. % 



