DICOTYLEDONOUS PLANTS 93 



Vn. CORYDALIS, Vent. 



Leafy-stemmed biennial herbs (the American species). 

 Leaves much divided, alternate or nearly opposite. Bacemes 

 terminal or opposite the leaves. Sepals 2, small. Petals 4 ; 

 corolla with a single spur at the base, on the upper side. 

 Capsule many-seeded. 



1. C. glauca, Pursh. Pale Corydalis. Plant erect, covered 

 witli a bloom. Flowers pink-purple with yellow tips. Spur of the 

 corolla very short and rounded. Rocky woods. 



2. C. aurea, Willd. Golden Corydalis. A low, spreading plant, 

 finally ascending. Corolla bright yellow, 1-2 in. long; the spur 

 shorter than the pedicel, somewhat bent. Shaded, rocky banks. 



39. CRUCIFER^. Mustard Family. 



Herbs with pungent, watery juice and alternate leaves with- 

 out stipules. Sepals 4, often falling off early. Petals usually 

 4, arranged in the form of a cross. Stamens 6, the 2 outer 

 ones shorter than the 4 inner ones. Fruit generally a pod, 

 divided into two cells by a thin partition which stretches 

 across from one to the other of the two placentae. The 

 flowers throughout the family are so much alike that the gen- 

 era and species cannot usually be determined without examin- 

 ing the tolerably mature fruit. 



A. 



Pods short and flattened, contrary to the partition, splitting open when ripe. 

 Pod roundish. Lepidium, I. 



Pod triangular, inversely heart-shaped. Capsella, IX. 



B. 



Pods globular or cylindrical, splitting open ichen ripe. 



(a) Pods globular. Flowers w^hite. Petals much longer 

 than the calyx. Cochlearia, II. 



(&) Pods cylindrical; seeds ellipsoid. Flowers very small, 

 yellow. Sisymbrium, III. 



