18. Cruciferae 73 



14. Descurainia Webb & Berth. — Tansy Mustard 

 1. Pods cla\ate, 7-10 mm lonj^; sandy soil or roadsides, common. 



Apr. -June D. brachycarpa (Ricliards.) O. E. Scluilz 



1. Pods linear, about 2 cm long; waste places, not common; adv. 



from Eur D. sophia (L.) Webb 



15. Draba L. — Whitlowcress 



1. Stem leafy-branched; pods narrowly oval, acute, 2-3 mm long, 1 

 nun wide, glabrous, 6- to 16-seeded, equalling or exceeding the 

 pedicels; petals entire, whitish, sometimes minute or none; diy 



soil, s. 111., extending northward to Coles Co. Apr. -May 



D. brachycarpa Nutt. 



1. Stem scapose, the leaves chiefly basal; pods 15- to 60-seeded. 

 2. Petals entire or emarginate, 3-5 mm long; pods mostly longer 

 than the pedicels. 

 3. Pods linear, 8-12 mm long, 1-2 nun wide, glabrous or hispidu- 

 lous; rachis and pedicels glabrous; leaves entire or nearly 



so; sandy soil, locally abundant; Apr. -May 



D. repians (Lam.) Fern. 



3. Pods oval to linear-elliptical, 6-15 mm long, 2 mm wide, 

 pubescent; rachis and pedicels pubescent; leaves dentate 

 above the middle; sandy soil, s. 111., Monroe and Randolph 

 counties. Mar.-May D. cuneijolia Nutt. 



2. Petals deeply 2-cleft; pods oval, glabrous, 4-10 mm long, shorter 

 than the pedicels; cultivated ground and waste places, occa- 

 sional; nat. from Eurasia. Mar.-May D. verna L. 



16. Dentaria L. — Toothwort 



D. laciniata Muhl. Woods, common throughout 111. Mar.-May. 

 [D. laciniata var. intcgra (O.E.Schul^:) Fern.]. 



17. lodanthus T. & G. 



/. pinnatifidus (Michx.) Steud. Woods, especially near streams, 

 local. May-July. 



18. Cardamine L. — Bittercress 

 1. Leaves toothed or entire; petals 7-12 mm long; plants perennial; 

 .stem with a tuberous base. 

 2. Petals white; stem 15-50 cm tall, puberulent at base, otherwise 

 glabrous; basal leaves oval; cauline leaves 4-8; wet ground. 

 May-June C. bulbosa (Schreb.) BSP. 



2. Petals pale lavender; stem 10-25 cm tall, sparsely hirsute, vary- 



ing to glabrous; basal leaves orbicular; cauline leaves 2-6; 



woods. Apr. -May C. douglassii (Torr.) Britt. 



1. Leaves pinnate or pinnatifid; petals white, 2-3 mm long; plants 

 annual. 



3. Leaves nearly all basal, more or less pubescent; stamens 4; an 



occasional weed in cultivated ground and greenhouses; nat. 

 from Eur. Apr.-May C. hirsuta L. 



