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IOWA ACADEMY OF SCIENCES 
MORACEAE. 
Humulus. 
255. H. lupulus L. Abundant in thickets. 
Cannabis. 
256 . C. saliva. L. L. Abundant along roadsides and in waste places. 
URTICACEAE. 
Urtica. 
257. XJ. 'dioica L. Scarce. In waste places. 
258. U. gracilis Ait. Common. 
Urticastrum. 
259. V. divaricatum (L) Kuntze. Common in woods. 
Adicea. 
260. A. pumila (L.) Raf. Abundant in damp places. 
Boehmeria. 
261. B. cylindrica (L.) Willd. Common in damp places. 
Parietaria. 
262. P. pennsylvanica Muhl. Common in damp v/oods. 
SANTALACEAE. 
COMANDRA. 
263. C. umdellata (L.) Nutt. Abundant. Along railways, etc. 
ARISTOLOCHIACEAE. 
Asarum. 
264. A. acuminatum (Ashe) Bicknell. Common in rich woods. 
265. A. refiexum amhiguum Bicknell. Plenty in woods. 
polygonaceae. 
Rumex. 
266. R. acetosella L. Abundant in fields and meadows. 
267. R. verticillatus L. Plenty in swamps. 
268. R. altissimus Wood. Plenty in wet places. 
269. R. hritannica L. Plenty in swamps. 
270. R. occidentalis S. Wats. Rare in wet places. 
271. R. crispus L. Quite abundant. 
272. R. sanguineus L. Scarce. 
273. R. persicaroides L. Scarce in swampy places. 
Fagopyrum. 
274. F. fagopyrum (L.) Karst. Escaped from cultivation. 
Polygonum. 
275. P. ampJiiMum L, Scarce in ponds. 
276. P. hartiorightii A. Gray. Common in swamps and marshes. 
277. P. emersum (Michx.) Britton. Abundant at edges of swamps. 
278. P, incarnatum Ell. 
279. P. lapathifoUum L. Along streams. 
280. P. lapathifoUum, nodosum (Pers) Small. 
