HITCHCOCK — PLANTS OF AMES, IOWA. 523 



Zanniciiklua palustris, L. Spec. 



Ponds and slow streams; not uncommon. 

 Nai v- flexilis, Rostk. & Schimi. Fl. Sedin. 1824. 



Ponds; becoming scarce. 



cyperacej:. 



Cvperus DIANDRUS, Torr. Cat. PI. X. Y. 1819. 



Wet sandy places; scarce. 

 Var. castaneus, (Pursh) Torr. 1. c— C. ftavcsccns, var. casta- 



?ie us. Pursh j Fl. 



Wet sands : abundant. 

 C. ARISTATTJS, Bottb. Gram. 



Wet sand: not nncommon. 

 ('. Schweinitzii, Torr. Cyp. 



Sandy soil; frequent. 

 C. filiculmis, Vahl, Enum. ii. 



Sandy hills; frequent. 

 C. erythrorhizos, Muhl. Gram. 



River banks; abundant. 

 G\ esculextus, L. Spec. 



Low ground ; abundant. 

 C. strigostjs, L. Spec. 



Low or sandy ground; abundant. 

 Var. robustior, Kunth, Enum. ii. 



Low ground ; common. 

 Eleochaeis palfstris, (L.) R. Br. Prod. Fl. Nov. Hoi. 1810 (by 

 implication^ . — Scirpus palustris, L. Spec. 



Wet places ; common. 



E. acicularis iL.) R. Br. 1. c— Scirpus acicularis, L. Spec. 



Muddy banks of ponds and streams; common. 

 Scirpus pfxgexs. Vahl, Enum. ii. 



Wet clay : scarce. 

 S. LACUSTRIS, L. Spec. 

 £hs, common. 

 S. fleviatilis, (Torr.) Gray, Man. 1st ed.— S. maritimus, L.,var.? 



/tuviatiiis, Torr. Cyp. 

 Marshes ; infrequent. 

 S. atbovirens, Muhl. Gram. 



^hs : common. 



Ertophorum lineatum, (Michx.) Benth. & Hook. Gen. PI. iii. 2, 



$. — Scirpus tinea turn, Michx. Fl. 

 Wet places; scarce. 



Bentham and H , "Hie includimus ....£". lineatus, Mich." 



xmibinatioo. 



