HITCHCOCK PLANTS OF AMES, IOWA. 52 I 



Hktkranthera graminea, (Michx.) Vahl. Enum. ii.—Lejitan- 



ikus gra7ttinea, Michx. Fl. 



Muddy banks of ponds and streams; scarce. 

 Lake 7 miles southeast of the College; Cairo lake. 

 COMMELINA CEJE. 



Tradescantia Virginiana, L. Spec. 



Low ground ; frequent. 

 A white-flowered form was found along the railroad, near the first bridge, going 

 towards Ames. 



JUNCA CE.E. 



JuNCUS TENUIS, Willd. Spec. ii. 

 Grassy places ; common. 



Qiiite variable in aspect. In dry soil it is low, with few- flowered panicles; in 

 wet places it becomes stouter, often two feet high, with more crowded inflorescence. 

 One form corresponds to "Forma major, floribus subsecundus" of specimens in the 

 Engelmann herbarium. It is not uncommon. Low or, usually, tall; flowers crowded 

 on the inner side of the ascending branches of the panicle, which tends to curve in- 

 ward at the top. 



J. NODOSUS', L., var. megacephalus, Torr. Fl. N. Y. ii. 



Wet places ; abundant. 



Tl'J'/rACE.E. 



Typha latifolia, L. Spec. 



Sloughs and ditches ; abundant. 

 Sparganium eurycarpum, Engel. in Gray, Mau. 2d ed. 



Marshes ; frequent. 

 S. SIMPLEX, Huds. Fl. Angl. 1762. 

 Marshes; scarce. 

 Four miles southwest of the College. 



AJiA CEjE. 



Aris.ema TRIPHYLLU3I, (L.) Torr. Fl. N. Y. ii. — Arum triphyllvm., 

 L. Spec. — A atrortibens^ Blume, in Rumphia, i. 1S35. (Engler, .i4rrt- 

 cecB in DC. Mon. Phan. ii.) 

 Rich woods ; not uncommon. 

 A. Dracontium, (L.) Schott, Melet. 1832. — .4/ M»i Dracontium, 

 L. Spec. 



Low woods ; infrequent. 

 AcoRus Calamus, L. Spec. 

 Marshes; scarce. 

 Two miles north of Ames, and elsewhere. 

 LEMXACE.E. 



Spirodela polyrrhiza, (L.) Schleid. iu Limi:ea xiii. 1839. — 

 Lemna polyrrhiza^ L. Spec. 



Bayous and slow-tlowing water; not uncommon. 



