10 FLTMARIACEAE. 



Dicextra. Corolla cordate or ^-spu^red at the base. 

 CORVDAiiis. Corolla 1-spurrfcd; flowers large, yellow. 



DICENTF^A Borkh. Low stemless perennials with ternately compound 

 and dissected leaves, and racemose nodding flowers. Pedicels 2-bracted 

 Petals slightly cohering-. Stigma 2-crested. 



D. cucullaria DC. Dutchman's Breeches. Plant from a scaly bulb of grain- 

 like tubers; leaf-lobes linear; flowers 5-8, white, on a scape, alternate, pedi- 

 celled; the 2 outer sepals with their divergent spurs longer than the pedicels. 

 Kich woods; April-May; common, ( Bicuculla curttllarin ( L.) Millsp.) 



D. canadensis DC. Squirrel Corn. Leaves similar to the preceding; roots 

 with yellow grain-like tubers resembling corn whence the name; flowers 4-7, 

 short pedicelled, greenish-white with a purplish tinge; spurs short, rounded. 

 Woods; May; rare; Winneshiek and Fayette counties. (B. canadensis (Goldie) 

 Millsp. ) 



COF^YDALIS Vent. Pale or glaucous leafy-stemmed biennials, with basal 

 and cauline decompound leaves, and racemose flowers, Petals erect-conni- 

 vent, deciduous, one of the outer pair spurred. Style dilated or lobed, per- 

 sistent. Pod linear or oblong, with many crested seeds. 



C. micrantha Gray. Much branched, diffuse or spreading; corolla pale 

 yellow; spur short, the crest entire or flowers very small and cleistogamous; 

 pods ascending, torulose, short pedicelled; seeds obtuse-margined, smooth. 

 Sandy soil; July; local; Muscatine, Lee, Linn, Winneshiek, Calhoun, and 

 Hardin counties. ( Capnoiclcs micrtmthum (Englm.) Britton.) 



C. curvisiliqua Englm. Stem 6-15 inches high, branched, more or less 

 rigid; flowers spicate, bright yellow, spur conspicuous; pods short-pedieelleL 

 curved upward, somewhat 4-sided. Sandy soil; April-June; frequent; Musca- 

 tine and Henry counties, reported from Page county. (C. curvislllqurn (Englm.) 

 Kuntze.) 



CRUCIFERAE B. .Thus. Mustard Family. 

 Herbs, with a pungent, watery juice, alternate exstipulate leaves, and 

 corymbose or racemose flowers. Sepals 4, decidubus, persistent in 

 Alyssum. Petals 4, hypogynous placed opposite in pairs, thus forming a 

 cross. Stamens 6, 2 in Lepidium, 2 shorter and inserted lower down. 

 Pods 2-celled, rarely 1-celled, linear, oblong, or short, dehiscent by 2 

 valves, except in Raphanus. Seeds in one or two rows, oblong, ovoid, or 

 globular, sometimes wing-margiued. The determinative characters of 

 this order depend largely upon the pods and seed. 



* Pod short, flattened contrary to the narrow partition; flowers white. 

 Capsella. Pod obeordate, triangular, wingless, several seeded. 

 L.EPIDIUM. Pod flat, oval, 2 seeded ; stamens 2. 

 Thlaspi. Pod obovate or obeordate, winged, several seeded. 



* * Pod linear, sometimes short, terete, turgid, or 4-angled; seed, winqlcss. 

 Nastdrtium. Pod oblong to short linear, valves strongly convex, nerveless; seeds in 2 



rows; flowers white or yellow, 

 Barbarea. Pod linear, terete, obscurely 4-angled; seeds in one row; flowers yellow. 

 Erysimum. Pod 4-angled, valves with prominent veins: stigma 2-lobed; flowers yellow. 

 Sisymbrium. Pod slender, short-pointed, teretish or angled, valves 1-3-nerved; flowers 



small, yellow or white. 

 Thelypodiuji. Pod terete, valves l-nerved; flowers large, purplish. 

 Brassica. Pod with a loDg stDut beak ; seeds globose. 

 Hespebis. Pod terete, long; flowers large, purple. 

 ***Pod compressed para'lel to Vic broad partition; seeds flat or flattish, or- 

 hLciilttr or oval, mixllii ivhngless. 



