HITCHCOCK PLANTS OF AMES, IOWA. 521 



Hetekanthera gr amine a, (Michx.) Vahl. Enum. u—Leplan- 



thus gramirica, 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. 



J uncus tenuis, Willd. Spec. ii. 

 Grassy places ; common. 



Quite 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. Lowor, 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. X. Y. ii. 



Wet places; abundant. 



TTPHACEM. 



Typha latifolia, L. Spec. 



Sloughs and ditches ; abundant. 

 Sparganium eurycarpum, Eugel. in Gray, Man. 2d ed. 



Marshes; frequent. 

 B. simplex, Huds. Fl. Angl. 1762. 



Marshes; scarce. 



Four miles southwest of the College. 



aracej:. 



Aris.ema TRiPHYiiLUM, (L.) Torr. Fl. X. Y. ii.— Aram triphyllum^ 



L. Spec. — A atroritbe?is. Blume. in Rumphia. i. 1835. (Engler. Ara- 

 cece in DC. Mon. Phan. ii.) 

 Rich woods : not uncommon. 



A. DRACONTIUM, (L.) Schott, Melet. 1832. — Arum Dracontium, 

 L. Spec. 



Low woods : infrequent. 

 ACORU8 Calami-. L. Spec. 

 Marshes : scarce. 

 Two miles north of Ames, and elsewhere. 



lemnacej:. 



Spirodela polyrrhiza, 1 L.j Schleid. in Liiim$a xiii. 1839.— 

 Lemna folyrrhiza. L. Spec. 



»us and slow-flowing water; not uncommon. 



