100 REED: MEADOW VEGETATION IN NORTHERN COLORADO 
two seasonal aspects: (a) early summer aspect with Thermopsis 
divaricarpa and Castilleia sulphurea dominant; (b) late summer 
aspect with Campanula petiolata dominant. 
3. Campanula-Eriogonum Society—This society is rather 
typical of the drier portions of the meadow especially that border- 
ing on dry grassland. Campanula Parryi, Eriogonum subalpinum, 
Galium boreale, Achillea lanulosa, Erigeron macranthus, Artemisia 
gnaphaloides, Stipa Nelsonit. 
4. Pentstemon-A goseris Society—This society is common in 
glacial sinks where the soil is deep and only moderately wet. A 
few invasions from the surrounding dry grassland are sometimes 
found. Pentstemon procerus, Agoseris glauca, Valeriana furfuras- 
cens, Pedicularis Parryi, Achillea lanulosa, Potentilla pulcherrima, 
Mertensia Bakeri, Festuca pseudovina, Danthonia intermedia. 
5. Potentilla-Fragaria Mixed Society—This society is typical 
of meadows along streams. There are no species that dis- 
tinguish the society, but a number are present in almost equal 
abundance and the plants named are all well represented. Poten- 
tilla pulcherrima, P. Hippiana, Fragaria glauca, Galium boreale, 
Valeriana furfurascens, Achillea lanulosa, Sieversia ciliata, Pseudo- 
cymopterus tenutfolius, Erigeron eximius, Dasystephana Parryt, 
Tium alpinum, Thalictrum Fendleri, Trifolium repens, Danthonia 
Parryi, D. intermedia, Koeleria cristata, Festuca rubra, A grostis 
hiemalis, Stipa Nelsonii. 
6. Dasiphora-Valeriana-Delphinium Society.—A society seen on 
moist gravelly soil well supplied with water. Dasiphora fruticosa, 
Valeriana furfurascens, Delphinium robustum, Fragaria glauca, 
Erigeron eximius, Galium boreale, Iris missouriensis, Caltha lepto- 
sepala, Pedicularis Parryi, Agoseris glauca, Pentstemon procerus, 
Achillea lanulosa, Tium alpinum, Pseudocymopterus tenutfolius, 
Sieversia ciliata, Campanula petiolata, Aragallus deflexus, Dasy- 
stephana Parryi, Castilleia sulphurea, Bistorta bistortoides, Potentilla 
pulcherrima, P. Hippiana, Aragallus Richardsonu, Carex festiva, 
Deschampsia caespitosa, Stipa Nelsonit, Festuca Thurberi, Koeleria 
cristata. 
7. Deschampsia-Valeriana Society—A society of fine-grained 
moist soil bordering sedge moors. Deschampsia caespitosa, Valeri- 
ana furfurascens, Thermopsis divaricarpa, Thalictrum Fendleri, 
