IOWA ACADEMY OF SCIENCES. 
221 
CHENOPODIACE^E. 
Chenopodium L. 
229. C. album L. Lamb’s-quarters, Pigweed. A com- 
mon weed, naturalized from Europe. 
280. C. boscianum Moq. Goosefoot. Common in 
woods. 
281. C. hybridum L. Maple-leaved Goosefoot. Woods, 
Iowa lake, and probably elsewhere in the 
country. 
Salsola L. 
282. S. tragus L. (8. kali var. tragus Moq.) Russian 
Thistle. A noxious European weed, very com- 
mon and troublesome in dry years. 
AMARANTHACEA5. 
Amaranthus L. 
288. A. retroflexus L. Pig- weed. A very common weed, 
naturalized from tropical America. 
284. A. blitoides S. Watson. A common weed around 
dwellings, naturalized from the western plains. 
285. A. grcecizans L. (A. albus L.) Our commonest 
tumble-weed, introduced from tropical America. 
Acnida L. 
286. A. tamariscina (Nutt.) Wood. Frequent along 
streams, and in low cultivated ground — occa- 
sionally in marshes; on muskrat houses. 
NYCTAGINAOEiE. 
Allionia Loefl. 
287. A nyctaginea Michx. * ( Oxybaphus nyctagineus 
Sweet.) Frequent on knolls and in cultivated 
fields. 
288. A. hirsuta Pursh. (Oxybaphus hirsutus Sweet.) Rare; 
dry ground along road south of Iowa Lake. 
