278 



Araceae 



Peltandra 



5 !3 



Map 573 



Peltandra virgin ica (L ) Kunlh 



L 



Map 575 

 Arisaema pusillum (Peck) Nash 



by Nieuwland, who later told me that the St. Joseph County report was 

 an error. Peattie reported it on the authority of Nieuwland as found 

 at Tamarack Station in Porter County, but I have not seen a specimen. 

 There is no specimen from Porter County in the herbarium of the Uni- 

 versity of Notre Dame. 



N. S. to Hudson Bay and Minn., southw. to N. J., Pa., Wis., and Iowa; 

 also in Eurasia. 



747. PELTANDRA Raf. 



1. Peltandra virginica (L.) Kunth. Virginia Arrow-arum. Map 573. 

 In shallow water or in wet, mucky soil on the borders of lakes and ponds 

 and along streams. Rather frequent in the lake area but rare to absent 

 south of this area. The leaf blades of this species are highly variable, and 

 a wide variation can be noted between the inner and outer leaves of the 

 same plant. Besides the typical form, Blake (Rhodora 14: 102-106. 1 pi. 

 1912) adds six forms, one of which has been reported from Indiana. I 

 doubt that any of the extreme forms occur in the state although Peattie 

 has reported f. hastifolia Blake from the dune region. 



S. Maine to Ont. and Mich., southw. to Fla., La., and Mo. 



786. ARISAEMA Martius 



Leaves pedately divided into 7-13 segments; spathe straight, narrow; spadix elongated 



into a caudate tip much longer than the spathe 1. A. Dracontium. 



Leaves 3-foliolate; lateral leaflets rarely cleft or parted; spathe hooded, rarely straight; 

 spadix shorter than the spathe. 

 Leaves green beneath; spathes purplish brown within and without; flowering about 



the middle of June; growing in bogs 2. A. pusillum. 



Leaves usually glaucous beneath ; spathes greenish or more or less densely purplish 

 brown within, usually green or greenish without, rarely purplish; flowering 

 before the middle of June; not growing in bogs 3. A. triphyllum. 



1. Arisaema Dracontium (L.) Schott. DRAGONROOT. Map 574. More or 

 less frequent throughout the state, growing in the shade in moist, rich 

 soil. 



N. E. to Minn., southw. to Fla. and Tex. 



