RYDBERG: PYTHOGEOGRAPHICAL NOTES 301 
Sagina saginoides (Eur.) Mimulus moschatus 
Thalictrum alpinum (Eur.)t Limosella aquatica (Eur.) 
Batrachium flaccidum (Eur.) Limosella tenutfolia (Eur.) 
Ranunculus reptans Veronica Wormskjoldit{ 
Cardamine pennsylvanica Elephantella groenlandica 
Subularia aquatica (Eur.) Senecio pauciflorus 
Epilobium alpinum (Eur.)t Lycopodium annotinum (Eur.) 
Epilobium Hornemannii (Eur.)+ 
c. Various mesophytes 
A few plants which are neither aquatics nor forest species have 
invaded the Rockies from the north. These are species that grow 
among bushes, among rocks, or on hillsides. 
Torresia odorata (Eur.) Juncoides parviflorum (Eur.) 
Calamagrostis purpurascens Juncoides intermedium 
Poa crocata Juncoides spicatum (Eur.)t 
Festuca rubra (Eur.) Blitum capitatum (Eur.) 
Bromus ciliatus Moehringia latifolia (Eur.) 
Carex praticola Moehringia macrophylla 
Carex concinna Viola adunca 
Carex Halleri (Eur.) 
2. PLANTS WITH RIPARIAN OR CAMPESTRIAN DISTRIBUTION 
These plants have crossed the continent over the plains, 
following mostly the watercourses. All of them are found in the 
foothills also and most of them attain their best development on 
the plains and _ prairies. 
a. Aquatic plants 
Sparganium angustifoliumt Panicularia grandist 
Potamogeton natans (Eur.)t Eleocharis palustris (Eur.)f 
Potamogeton alpinus (Eur.)t Eleocharis acicularis (Eur.){¢ 
Potamogeton lucens (Eur.)t Eriophorum gracile (Eur.)t 
Potamogeton foliosust Scirpus validust 
Triglochin maritima (Eur.) Lemna trisulca (Eur.)t 
Alisma brevipes Lemna minor (Eur.)t 
Sagittaria latifoliat Persicaria coccineat 
Phragmites Phragmites (Eur.)t Batrachium trichophyllum (Eur.)t 
