IOWA ACADEMY OF SCIENCE 
59 
CRUCIFERAE. 
DR ABA (Dill) L. 
427. Draba caroliniana Walt. Smooth Carolina Whitlow Grass. Com- 
mon in sandy soils. 
428. Draba caroliniana Var. micrantha Nntt. Hairy Carolina Whit- 
low Grass. With the above. 
ALYSSUM (Tourn) L. 
429. Alyssum alyssoides L. Yellow or Small Alyssum. Rare; Iowa 
City. 
THLASPI (Tourn) L. 
430. Thlaspi arvense L. Field Penny Cress or Frenehweed. Becom- 
ing established especially along railways. 
LEPIDIUM (Tourn) L. 
431. Lepidium virginicum L. Wild Pepper Grass. Roadsides and 
waste places. 
432. Lepidium apetalum Willd. Apetalous Peppergrass. In similar 
places but more common. 
CAPSELLA Medic. 
433. Gapsella bursa-pastoris (L.) Medic. Shepherd’s Purse. A com- 
mon weed of fields and waste places. 
CAMELINA Crantz. 
435. Camelina saliva (L.) Crantz. - False Flax or Gold-of-pleasure. 
An introduced weed, not rare in fields. 
NESLIA Desv. 
436. Neslia paniculata (L.) Desv. Ball Mustard. Rare ; persistent in 
one locality near Iowa City. 
RAPHANUS (Tourn) L. 
437. Raphanus sativus L. Radish. Occasionally established in waste 
places. 
CONRINGIA (Heist) Link. 
438. Conrmgia orientalis (L) Dumort. Hare’s Ear Mustard. Scarce 
but becoming established. 
