lu FCJMARIACEAE. 



Dicsstra. C(»n>lla cordate or 2-spu r red at the base. 

 UoRYDALis. Corolla I -spurred; flowers large, yellow. 



DICENTRA Borkh. Low stemless perennials with ternately compound 

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

 Petals slightly cohering. Stigma r.'-crested. 



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

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

 celled: the .1 outer sepals with their divergent spurs longer than the pedicels. 

 Rich woods: April-May: common. ( Bicuculkl cucullaria ( L.) Millsp. ) 



D. canadensis DC. Squirrel Corn. Leaves similar to the preceeding; 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. i 



CORYDALIS 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. (Cnpnoidc* micmntlium (Englm.) Britton.) 



C. curvisiliqua Englm. Stem <j-l"> inches high, branched, more or less 

 rigid: flowers spicate, bright yellow, spur conspicuous: pods short-pedicelle 1. 

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

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

 Kuntze.) 



CRUCIFERAE B. Juss. Mustard Family. 



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

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

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

 cross. Stamens 6, 2 io 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-margined. The determinative characters of 

 this order depend largely upon the pods and seed. 



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



i'atseli.a. Pod obcordate, triangular, wingless, several seeded. 



Lepidium. Pod flat. oval. 2 seeded: stamens 2. 



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



** Po.'i linear, sometimes short, terete, turgid, or 4-angled; seal wingless. 



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

 rows: flowers white or yellow. 



Barbarba. Pod linear, terete, obscurely 4-angled: seeds in one row: Mowers yellow. 



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



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

 small, yellow or white. 



THKLYPOOIUM. Pod terete, valves 1 -nerved; flowers large, purplish. 



Brasslca, 1'"<i with a Long st »u1 beak; seeds globose. 



Hksi-kkis. Pod terete, long; flowers large, purple. 



*** I'oti compressed parallel to the broad pnrtttlon; seeds flat or flattish, or- 

 bicular or oval, m >sihj wingless. 



