2a. Flowers in clusters of 2-4, about 3 cm. wide (spring) =Celandine Poppy, Stylophorum diphyllum.= 2b. Flowers in umbels of 3-8, about 1.5 cm. wide =Celandine, Chelidonium majus.= FUMARIACEAE, the Fumitory Family Herbs with watery juice, compound or dissected leaves, and irregular flowers; sepals 2, small; petals 4, in two pairs, and one or both of the outer pair spurred at the base; stamens 6. 1a. Both outer petals spurred or sack-like at the base --2. 1b. One outer petal spurred or sack-like at the base --4. 2a. A climbing vine with flowers in panicles (white or pinkish flowers in summer) =Climbing Fumitory, Adlumia fungosa.= 2b. Low herbs (2-4 cm.) with basal leaves and white or pinkish flowers in racemes (early spring) --3. 3a. Spurs of the corolla triangular, divergent =Dutchman's Breeches, Dicentra cucullaria.= 3b. Spurs of the corolla short and rounded =Squirrel Corn, Dicentra canadensis.= 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 (2-6 dm. high) (Corydalis) --5. 5a. Flowers yellow throughout (spring) =Corydalis, Corydalis aurea.= 5b. Flowers pink, tipped with yellow (summer). =Corydalis, Corydalis sempervirens.= CRUCIFERAE, 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. 1a. Petals yellow or yellowish --2. 1b. 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 summer) --7. 6b. Flowers 5 mm. wide or more (2-6 dm. high; flowers in summer) --8. 7a. Leaves about twice as long as broad, widest near or below the middle =Whitlow Grass, Draba nemorosa.=