884 RETORT OF STATE GEOLOGIST. 



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A. verticillata L. Whorled Milkweed. 



Easily recognized by its narrowly linear, sessile leaves, 

 which are usually arranged in whorls of from three to seven. A 

 dry soil form, ordinarily found on high ground in sandy soil. 

 More abundant in northern part of its range. 



Flowers from July until September. 



St. Joseph (Barnes); Clark (Baird and Taylor); Cass and Mar- 

 shall (Hessler); Yigo (Blatchley). 



ACERATES Ell. 



A. viridiflora (Raf.) Eaton. Green Milkweed. 



The species in our State is confined in its mass distribution 

 to dry, sandy soils of the northern counties. It is occasionally 

 found in rocky regions farther south. 



Flowers from June through September. 



St. Joseph (Barnes); Tippecanoe (Hussey); Clark (Baird and 



Taylor); Lake (Hill); Elkhart; Steuben (Bradner). 



A. Floridana (Lam.) Hitchc. 



(A. longifolia Ell.) 

 Found in moist, rich soils, usually the loams along streams or 

 about small inland lakes. More common in the northern coun- 

 ties, occasionally found, however, in the southern part of the 

 State. 



Flowers from June through September. 



Tippecanoe (Cunningham); Cass (Hessler); Jasper (Barnes); 

 Gibson and Posey (Schneck); Kosciusko (Coulter). 



AMPELANUS Raf. 



albidus (Nutt.) Brittou. 



(Enslenia alb Ida Nutt.) 



A trailing form that has entered our flora from the south. Con- 

 fined to the southern counties, its northern record being Yigo 

 County. It is found growing in wet soils usually on the banks of 

 streams or in bottom land thickets. Usually abundant in the 

 stations where it occurs. 



Flowers in June and July. 



Jefferson (Barnes); Gibson and Posey (Schneck); Clark (Baird 

 and Taylor); Franklin (Meyncke); Vigo (Blatchley). 



