15$ 
FIFTEENTH REPORT. 
Arenaria serpyllifolia. 
Antennaria mesochora. 
Taraxacum Taraxacum. 
June 2nd. 
Senecio Sp. 
June 9tli. 
Arenaria strieta. 
Ranunculus fascicularis. 
Arabis laevigatas. 
Houstonia longifolia. 
June 11th. 
Sisyrinchium albidum. 
Stellaria media. 
Potentilla argentea. 
Oxalis strieta. 
Lithosperaium arvense. 
Lithospermum canescens. 
Pentstemon hirsutus. 
June 30th. 
Danthonia spicata. 
Helianthemum majus. 
Cynoglossum officinale. 
Plantago lanceolata. 
Campanula intercedens. 
July 11th. 
Silene dichotoma. 
This is new to the state, at least it is not included in Beal’s Michigan 
Flora. Another species of Silene, not included in the work just men- 
tioned. and collected by me at Detroit, is S. Gallica. It was observed 
at Galesburg also, but not collected at that station. 
July 14th. 
Bromus seealinus. 
Erigeron ramosus. 
July 28th. 
Polygonum tenue. 
Anemone cylindrica. 
Verbascum Thapsus. 
Solidago juncea, Var. scabrella. 
Lactuca hirsuta. 
This species is common on the dry uplands and is also found but 
much less frequently in the lowland and on the flood plain. 
August 4th. 
Eragrostis multiflora. 
Carex alopecoidea. 
September 2nd. 
Solidago nemoralis. 
Aster azureus. 
Aster laevis. 
Aster lateriflorus. 
Aster lateriflorus, Var. glomerellns. 
Aster sagittnefolius. 
