402 
FIFTEENTH REPORT. 
POTEXTILLA MOOR. 
June 23rd. 
Salix serissima. 
Potentilla fruticosa. 
Convolvulus Americanus. 
July 14th. 
Trichophyllum rostellatum. 
Scirpus Americanus. 
Triodon capillacea. 
Aster concinnus (?). 
July 28th. 
Equisetuin variegatum, Yar. Jesupi. 
Agropyron repens. 
Scirpus occidentalis. 
Triodon glomerata. 
Silene noctiflora. 
Mei bomia Can adensis. 
August 4th. 
Scirpus validus. 
Euphorbia maculata. 
Aster laevis, Yar. laevigatus. 
THE MUD OR REED SWAMPS. 
In many places on the flood plain and lowland, the overflow from 
springs, finding no outlet to the river, accumulates and converts the 
rich muck soil into reed or mud swamps. A characteristic flora ap- 
pears in these places. 
MUD AND REED SWAMPS. 
May 10th. 
Spathyema foetidus. 
Caltha palustris. 
Yiola cucullata. 
June 11th. 
Equisetnm fluviatile, Var. limosum. 
June 30th. 
Panicularia nervata. 
Radicula Nasturtium- Aquaticum. 
Galium tinctorium. 
July 4th. 
Sparganiuin eurycarpum. 
Panicularia grandis. 
Acorns Calamus. 
July 28th. 
Impatiens biflora. 
Heracleum lanatum. 
August 4th. 
Osmunda cinnamomea. 
Onoclea sensibilis. 
Sagittaria latifolia. 
Sagittaria latifolia, Yar. hastata. 
