316 



Rydberg: Phytogeographical notes 



of Colorado, and here we find most of the aquatic vegetation. 

 The majority of the phaneorgamic plants are found also in the 

 plains and prairie regions. To these belong a score of species of 

 Potamogeton which here are omitted. Besides these the following 

 species are found: 



i. Transcontinental and eastern 



Sparganhim angustijolium 

 Sparganium minimum 

 Triglochin palustris 

 Triglochin maritima 

 Alisma brevipes 

 Sagittaria latifolia 

 Phragmites Phragmites 

 Catabrosa aquatica 

 Panicularia grandis 

 Panicularia borealis 

 Panicularia septentrionalis 

 Eleocharis palustris 

 Scirpus validus 

 Lemna trisulca 

 Lemna gibba 

 Lemna minor 



Crunocallis Chamissonis 



Persicaria coccinea 

 Batrachium trichophyllum 

 Batrachium flaccidum 

 Batrachium Drouetii 

 Ranunculus Purshii 

 Sisymbrium Nasturtium- 



aquaticum 

 Callitriche palustris 

 Callitriche autumnalis 

 Hippuris vulgaris 

 Sium cicutifolium 

 Menyanthes trifoliata 

 Veronica americana 

 Utricularia vulgaris 

 Utricularia minor 



Western 



Nymphaea polysepala 



3. Endemic 

 Panicularia pauciflora Cardamine injausta\ 



Agrostis depressa\ Ranunculus intertextus\ 



Cardamine cordijolia\ 



B. SEDGE BOGS 

 The sedge bogs are found where the drainage is poor or in low 

 places around lakes, ponds, and streams. In most cases the most 

 numerous plants are species of Car ex, but many grasses also are 

 intermixed, and in some places they are predominant. Of these 

 Alopecurus aristulatus and Agrostis alba are the most frequent and, 

 in the lower part of the zone, species of Calamagrostis. The com- 

 position of the bog vegetation consists of the following plants:— 



