ORDER 13. CRUCIFERJE. 233 



Biliquc flat, linear or oblong, valves indistinctly veined ; seeds in a single 

 row, flattened, wing-margined ; embryo nearly straight, curving towards 

 an accumbent form. @ Low, smooth herbs with lyrate-pinnatifid Ivs. 

 Fls. yellowish. 



L. Michauxii Torr. (and L. aurea Torr.). On wet rocks S. E. Ky. to Texas. 

 Plant 2 6 high. Lvs. mostly radical, an inch or two in length, segm. 1 5, 

 angular. Fls. at first solitary, on slender scapes, finally racemed. Petals twico 

 longer than the sepals, yellow, at least its broad claws. Pod3 erect, 3 5-seeded. 

 Mar., Apr. (Cardamine uniflora. MX.) 



10. BARBAREA, R. Br. WINTER CRESS. (In honor of St. Bar- 

 bara who discovered [what are since unknown] its medicinal proper- 

 ties.) Sepals erect ; siliques columnar, 2 or 4-angled, valves carinate 

 with a mid-vein ; seeds in a single row (0 = ). Lvs. lyrate-pinnatifid. 

 Fls. yellow. 



1 B. vulgaris R. Br. Upper Ivs. toothed or pinnatifid at base ; siliqites obscurely 

 4-angled, pointed with the style. D Fields and brooksides, common, N. States. 

 Whole plant glabrous. St. furrowed, 1 2f high, branching above. Lower Ivs. 

 lyrate pinnatitid, with small, oblong pinnas, and a large, broad-ovate, terminal lobe, 

 dark green, shining, with clasping petioles ; upper Ivs. sessile, all very obtuse. Fls. 

 in dense racemes. Pods about 9" long, usually curved, ascending or erect. May, Jn, 



2 B. precox R. Br. BELLE ISLE CRESS. SCURVY GRASS. Upper Ivs. pinnati- 

 fid, with the lobes all linear-oblong; silique 2-edged. % Cultivated southward 

 for salad, and sparingly naturalized. St. slender, If high. Lower Ivs. with the 

 terminal lobe ovate. Siliques 2 or 3' long. Apr., Jn. 



11. ERYSIMUM, L. FALSE WALL FLOWER. (Gr. epwu, to cure ; from 

 its salutary medicinal properties.) Calyx closed ; siliques columnar, 

 3-sided, valves with a strong mid-vein ; stigma capitate ; seeds in a sin- 

 gle series ; cotyledons oblong, 0[|. Fls. yellow. 



1 B. cheiranthoidea L. Pubescence minute, appressed, branched; Ivs. lanceo- 

 late, denticulate, or entire; fls. small; siliques short (8 10"), on slender, spread- 

 ing pedicels ; stig. small, nearly sessile. CD By streams and in wet grounds, U. S. 

 and Can., not common. St. erect, 1 2f high, often branched, and, with the 

 leaves, scabrous. Lvs. acute at each end, 1 2' long, as wide. Fls. small, yel- 

 low, in long racemes. Siliques i to near 1' in length, linear, and somewhat 

 spreading. Jl. 



2 E. Arkansanum Nutt. YELLOW PHLOX. Scabrous, with an appressed pu- 

 bescence ; st. simple ; Ivs. linear-lanceolate, remotely dentate, sessile, lower ones 

 runcinate-toothed ; inflorescence racemous, corymbed at summit ; siliques long 

 ('), erect, on short, erect pedicels ; stig. capitate. A fine plant, with large, 

 showy flowers, resembling the wall-flower, on bluffs along rivers, Ohio to Ark. 

 St. 1 3f high, slender. Lvs. 2 3' by 3 6". Sep. straw-colored. Petals large, 

 bright-orange yellow. Siliques 3' long. Jn., Jl. 



12. SISYMBRIUM, Allioni. (An ancient Greek name.) Calyx half- 

 spreading, equal at base ; petals unguiculate, entire : silique subterete, 

 valves concave, marked lengthwise with 1 3 veins; style very short; 

 seeds in a single series, ovoid, 0||. Fls. (yellow) small. 



1 S. officinale Scop. HEDGE MUSTARD. Lvs. runcinate ; rac. slender, virgate ; 



siliques subulate, erect, closely appreased to the rachis. T) A common weed, in 



fields, roadsides, rubbish, etc., Can. and U. S. St. 1 3f high, with spreading 

 ' branches. Lower Ivs. 3 8 f by 1 3', the lower segments placed at right angles 



to the midvein, or pointing backwards, the terminal segment largest. Upper Ivs. 



in 3 lanceolate segments at right angles. Fls. small, yellow, terminating the ra- 



