REED: MEADOW VEGETATION IN NORTHERN COLORADO 103 
recurvatum, Arabis divaricarpa, A. hirsuta, Potentilla monspeliensis, 
Lappula floribunda. Of the annuals and biennials, Allium re- 
curvatum is the only one that appears in any great abundance; 
the others are infrequent. 
FREQUENCY OF OCCURRENCE OF DIFFERENT SPECIES 
The various species do not occur with the same frequency in 
each meadow. Some are found in great profusion either locally 
or widely distributed. Others, which likewise may be either local 
or widely distributed. are never found abundantly in any place. 
In the following list frequency is indicated by letters: (¢) abundant, 
(f) frequent, (0) occasional. 
SYSTEMATIC LIST OF MEADOW PLANTS IN BOULDER PARK WITH 
THEIR FREQUENCY AND WATER REQUIREMENTS 
OPHIOGLOSSACEAE 
Botrichium Lunaria (0) 6,7 
POACEAE 
ohh hiemalis (f) 6 Koeleria cristata (a) 5, 6 
Agropyron pseudorepens (a) 5, 6 Phleum alpinum (f) 5, 6, 7 
Daas caninum (a) 6 Phleum pratense (f) 5, 6 
Agropyron Richardsonii (f) 6 Poa epilis 
Avena americana (f) 5, 6 Poa interior (f) 5, 6 
Bromus lanatipes (f) 5, 6 Poa nevadensis (f) 6 
Bromus Porteri (a) 6 Poa rupicola (f) 6 
Calamagrostis canadensis (f) 7 Poa subpurpurea (a) 5, 6 
anthonia intermedia (f) 6 Savastana odorata (a) 6, 7 
Danthonia Parryi (e) 5, 6 Sitanion longifolium (f) 5 
Deschampsia caespitosa (a) 6, 7 Sitanion brevifolium (0) 5 
Elymus glaucus (f) 7 Sporobolus asperifolius (f) 6,7 
Festuca confinis (f) 6 Stipa Nelsonii (a) § 
Festuca ingrata (f) 6 Stipa Minor (f) 5, 6 
Festuca pseudovina (a) 5, 6 Stipa viridula (f) 6 
Festuca rubra (0) 6 Trisetum subspicatum (f) 5, 6 
Festuca Thurberi (a) 5, 6 
CYPERACEAE 
Carex festiva (a) 6, 7 Carex pennsylvanica (f) 6, 7 
Carex lanuginosa (f) 7 Carex utriculata (f) 7 
Carex occidentalis (f) 7 
MELANTHACEAE 
Anticlea elegans (f) 6 
JUNCACEAE 
Juncus balticus montanus (a) 5, 6 Juncus saximontanus (f) 7 
