156 
FIFTEENTH REPORT. 
June 23rd. 
Opulastei* opulifolius. 
June 30th. 
Carex vulpinoidea. 
Rumex crispus, 
T h a 1 i c t m m d a sy c a rpu m . 
Ba rbarea Ba rbarea . 
Barbarea Barbarea, Var. longisiliquosa. 
Geum Canadense. 
Geum strictum. 
The last two also in the tamarack swamp. 
Gen m Y i rg i n i an um . 
Lobelia leptostachys, Yar. hirtella. 
Erigeron animus. 
Erigeron Philadelphicns. 
The last two also in the tamarack swamp. 
Achillea occidental is. 
July 4th. 
Oxalis corniculata (O. cymosa). 
Leonurus Cardiaca. 
July 14 th. 
Ascelepias Svriaca. 
Prunella vulgaris. 
July 28th. 
A nem one Y i rgin i an a . 
Clematis Yirginiana. 
Spiraea alba. 
Agrimonia jiubescens. 
Trifolium hybridum. 
Trifolium pra tense. 
Trifolium repens. 
Oenothera muricata. 
Yerbena hastata. 
Stachys tenuifolia, Yar. aspera. 
Monarda mollis. 
Mentha Canadensis. 
Galium asprellum. 
Heliopsis scabra. 
Cirsium lanceolatum. 
August 4th. 
Set aria glauca. 
Poa annua. 
Trichophyllum palustris. 
Scirpus atrovireus. 
Kcirpus atrovireus, Yar. pycnocephalus. 
Juncus Dudleyi. 
Salix cordata. Yar. angustata. 
Salix longifolia. 
Rumex obtusifolius. 
Polygonum Persicaria. 
Saponaria officinalis. 
Ranunculus Pennsylvanicus. 
