4a. Flowers about 5 mm. long, pink-purple tipped with red (3 8 

 dm. high; summer) Fumitory, Fumaria officinalis. 



4b. Flowers 10 mm. long or more, yellow, at least at the tip 

 (26 dm. high) (Corydalis) 5. 



5a. Flowers yellow throughout (spring) Corydalis, Corydalis aurea. 

 5b. Flowers pink, tipped with yellow (summer). 



Corydalis, Corydalis sempervirens. 



CRFCIFERAE, the Mustard Family 



Herbs, with alternate, frequently lobed or dissected leaves, and 

 regular flowers, usually in racemes; sepals and petals each 4, stamens 

 6, 4 long and 2 short (or rarely 2 only), ovary 1. 



la. Petals yellow or yellowish 2. 



Ib. Petals white, pink, or purple, never yellow 29. 



2a. Leaves simple, entire or dentate, never lobed 3. 

 2b. Leaves deeply lobed or compound (the bracteal leaves, at 

 or near the flower-clusters, may be simple and unlobed) 10. 



3a. Leaves clasping the -stem 4. 

 3b. Leaves not clasping at base 6. 



4a. Clasping base and apex of leaf obtuse or rounded; pod very 

 long and slender (3 8 dm. high; summer) 



Hare's Ear, Conringia orientalis, 



4b. Clasping base and apex of leaf acute; pod obovoid (3 7 dm. 

 high; early summer) (False Flax) 5. 



5a. Stem and leaves glabrous False Flax, Camelina sativa. 



5b. Leaves and usually the stem pubescent 



False Flax, Camelina microcarpa. 



6a. Flowers about 2 mm. wide (1 3 dm. high; flowers in sum- 

 mer) 7. 



6b. Flowers 5 mm. wide or more (2 6 dm. high; flowers in sum- 

 mer) 8. 



7a. Leaves about twice as long as broad, widest near or below the 

 middle Whitlow Grass, Draba nemorosa. 



7b. Leaves 3 5 times as long as broad, widest above the middle 



Yellow Alyssum, Alyssum alyssoides. 



8a. Leaves lanceolate, gradually tapering to the base; flowers 

 about 15 mm. wide Sand Rocket, Diplotaxis muralis. 



8b. ' Leaves ovate, acute at base; flowers about 15 mm. wide 



22a. 

 8c. Leaves entire or minutely toothed; flowers 5 10 mm. 



wide 9. 



