173] FLORA OF COLUMBIA AND VICINITY 3 I 



A. vulgaris Glyceria nervata 



Eatonia Pennsylvanica Festuca elatior 



With these grow many marsh herbs, species of Lycopus, 

 Mentha, Mimulus, Lobelia, and Aster. Certain sedges, notably 

 Carex tribuloides, C. cristatella, C. scoparia, and C. straminea, 

 and the true rushes (Juiicus spp.) are frequent. 



b. Uliginosae caricoides. The sedge association occu- 

 pies usually the wettest portion of a marsh, and its vegetation 

 is marked by a deeper green than that of the grasses. 



It has two sub-associations according as the species of Ca- 



re.v or of Cyperns are dominant : 



i. Uliginosae caricoides caricinae. 



Eriophorum lineatum C. tribuloides 



Scirpus atrovirens C. cristatella 



Heleocharis tenuis C. scoparia 



H. intermedia C. straminea 



Carex Sartwellii C. tenera 



C. vulpinoidea C. Davisii 



C. interior C. Frankii 



ii. Uliginosae caricoides cyperinae. 



Cyperus inflexus C. erythrorhizos 



C. acuminatus C. speciosus parvus 



C. Hallii (rare) C. strigosus 



C. esculentus 



c. Uliginosae juncoides. The true rushes occupy the 

 zone of cold barren soil. Here the vegetation is much thinner 

 than elsewhere. Ordinarily the spike-rushes {Heleocharis spp.) 

 are frequent also. The lists of species of /uncus and Heleo- 

 charis already given ' will do also for this association, which 

 is found everywhere in springy soil. 



d. Uliginosae polygonioides. The smartweed com- 



' Supra, pp. 21, 22, 30. 



