PLANTS OF IOWA 163 



2101. A. liyhridus, L. Slender Pigweed. 



Introduced from tropical America. CommoD weed 



2102. A. hybridus paniculatv.s, (L.) Arline & Br. 

 Frequent in waste places. 



2103. A. grcBcizans, L. Tumble Weed. 

 Common. 



2104. A. torreyi, (A. Gray) Reuth. Torrey'a Amaranth. 

 Introduced from southwest. Frequent. 



Acnida, L. 



2105. A. tamariscina, (Nutt) Wood. Western Water Eemp. 



In wet places. 



2106. A. tamariscina Uibercidata, (Moq.) Uline & Bray. 

 River banks, frequent. 



Frcelichia, Moench. 



2107. F. floridana, (Nutt) Moq. Florida FrceUcha. 

 Dry sandy soil, frequent. 



PHYTOLACCACE.S. POKEWEED FAMILY. 



Phytolacca* L. 



2108. P. decandra, L. Pokeweed. 

 Introduced, from Europe. 



NYCTAGINACE^. FOUR O'CLOCK FAMILY. 



Allionia. 



2109. A. nyctaginea, Michx. Wild Four O'clock. 

 Common in dry places. 



2110. A. liirsuta, Pursh. Hairy Umbrella-wort. 

 In dry soil. Infrequent. 



AIZOACEJE. CARPETWEED FAMILY. 



llOLLUGO, L. 



2111. M. verticillata, L. Carpet Weed. 

 Common in sandy and waste grounds. 



PORTULACACE.E. PURSLANE FAMILY. 



Talintjm, Adams. 



2112. T. terctifolium, Flame Flower. 

 Not common. 



