Henderson : New Plants from the Northwest 



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as well as to /. cchinospora Braunii. To the latter it bears very- 

 little resemblance, since the leaves are rigid, not giving way in the 

 slightest when taken from the water, and the macrospores have 

 never the spinules of that species. 



To Isoetes lacnstris it is certainly very near, perhaps too near 

 for specific delimitation, but it differs from either the European or 



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American forms of that species in the more numerous and taper- 

 ing leaves, apparently thicker than any forms of /. lacnstris, in the 

 macrospores smaller and less conspicuously crested, but especially 

 in the smaller and very rough microspores. Perhaps including 

 Engelmann's var. paupcratla as a small form. In other forms of 

 apparently the same species the leaves are thicker, not so tapering, 

 and merely acute. Such a form I collected many years ago in 

 Lost Lake, near Mt. Hood. 



