Dicotyledones. 47 



II. CORYDALIS. 



(Ancient Greek name for the crested lark.) 



Only the upper outer petal spurred at the base. Pod with few to 

 many crested seeds. The interior petals narrow and keeled at the back. 

 Stamens 6 in 2 sets, opposite the outer petals. Placentae 2 ; style 

 persistent. Capsule linear or oblong, 2-valved. Flowers in racemes. 



1. Corydalis flavula, DC. (L., flavus, golden yellow.) PALE CORYDALIS. 

 Flowers k to J inch long; spur short; pods drooping or spreading. Pedicels 

 slender in the axils of conspicuous bracts; flowers pale yellow. Stems slender, 

 diffuse or ascending. Lower leaves petioled, the upper nearly sessile, finely 

 dissected. In woods or on rocky banks. 



2. Corydalis micrantha, Gray. (Gr., micros, small ; anthos, flower.) SMALL- 

 FLOWERED CORYDALIS. Similar to the above, but with pods ascending and 

 short-petioled. 



3. Corydalis aurea, Willd. (L., aureus, golden.) GOLDEN CORYDALIS. 

 Flowers from \ to f inch long, spur conspicuous, about half as long as the corolla. 

 Corolla golden yellow. Pods spreading or pendulous, becoming swollen at inter- 

 vals. Var. occidentalis , Englm., has the spur nearly as long as the body of the 

 corolla. On rocky banks. 



CRUCIFER^. MUSTARD FAMILY. 



Mostly herbs with acrid juice. Leaves alternate, and flowers in 

 racemes or corymbs. Flowers cruciform. Sepals 4 ; petals 4, spreading 

 in the form of a cross. Stamens 6 (sometimes fewer) and tetradyna- 

 mous, 2 being usually shorter than the other 4. Pistil superior, consist- 

 ing of 2 carpels united to form a compound pistil with a thin partition 

 connecting the 2 parietal placentae. Fruit a silique or silicic, usually 

 2-celled, rarely i -celled. 



FLOWERS, WHITE. 



I. SEEDS IN 2 ROWS IN EACH CELL. 



Pods more or less compressed parallel with the partition. 



(a) Low-tufted herbs, often with stellate pubescence. DRABA XII. 



(3) Leaves lanceolate or linear; pods at length orbicular. ALVSSUM XIV. 



(c) Pods linear; seeds often wing-margined. ARABIS XIII. 

 Pods more or less compressed at right angles to the partition. 



(a) Pods short, obcordate-triangular. CAPSELLA X. 

 Pods terete or turgid. 



(a") Pods elongated, often angled ; valves i-3-nerved. SISVMBRIUM II. 



(3) Pods globular to oblong-linear; valves nerveless. NASTURTIUM IV. 



II. SEEDS IN I ROW, OR SINGLE IN EACH CELL. 



Pods more or less compressed parallel with the partition. 



(a) Pods becoming orbicular; leaves oblong or linear; leafy throughout. 



ALYSSUM XIV. 



