IOWA ACADEMY OF SCIENCES 
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P. 
pennslvanicum L. 
persicaria L. Plenty. 
persicaroides H. B. K. 
opelousanum Riddell. Scarce. 
hydropiperoides Michx. Abundant in swampy places. 
Tiydropiper L. Plenty in swampy places. 
punctatum Ell. Plenty. 
orientale L. Escaped from gardens. 
virginianum L. Scarce. 
aviculare L. Common. 
littorale Link. 
rayi Babingt. 
exsertum Small. 
ramoissimum Michx, 
camphorum Meisn. Rare; on sandy hills. 
tenue Michx. 
convolvulus L. 
scandens L. 
CHENOPODIACEAE. 
Chenopodium. 
299. C. album L. Abundant everywhere. Very variable in form. 
300. C. glaucum L. Rare in waste places. 
301. C. hoscianum Moq. Plenty in woods. 
302. C. hybridum L. Plenty in waste places. 
303. (7. bonus-henricus L. Scarce. In wet places. 
Cycloloma. 
304. C. atriplici folium (Spreng.) Coult. Scarce in sandy soil. 
Atriplex. 
305. A. patula L. Scarce, In waste places. 
306. A. hastata L. Scarce in waste places. 
Salsola. 
307. S. tragus L. Scarce; hardly holds its own. 
AMARANTHACEAE. 
Amaranthus. 
308. A. retrofiexus L. Abundant everywhere. 
309. A. hybridus L. Rather scarce. 
310. A. hybridus, paniculatus (L.) Uline & Bray. Scarce. 
311. A. blitoides S. Wats. Common everywhere. 
312. A. graecizans L. Scarce; formerly abundant. 
Acnida. 
313. A. tamariscina (Nutt.) Wood. 
NYCTAGINACEAE. 
Allionia. 
314. A. nyetaginea Michx. Abundant. 
• 315. A. hirsuta Pursh. Rather scarce in dry fields. 
