

M 



EJ^GELMANX — THE GENUS ISOETES IN N.AMERICA. 35^ 



it his I. MACROSPORA. No date being indicated on the labels, the 

 above-mentioned year is a mere guess. 



1825 (?). Jens Vahl collected in Greenland a small Isoetes^ 

 referred to /. lacustris^ which proves to be one of the forms of 



I. ecJii7tospora. 



1831. J. W. Robbins gathered an Isoetes near Uxbridge, 



h I recognize as /. riparia. 



J. Moser, who collected for the German Unio itine- 

 raria^ obtained specimens on the Lehigh river near Bethlehem, 

 Pa., and near Philadelphia, both of which were distributed to the 

 subscribers as /. lactistris. One of these (in Herb, Bernhardi, 

 now in the Herb, Missouri Bot. Garden) represents 7. Engel- 

 manaz; another, which I have seen in Europe, is 7. riparia. 

 1834. Th. Nuttall discovered an Isoetes on the Columbia river 



I saw in E, Durand's Heib. with Nuttall's own 

 label, 7 opaca ; it was afterwards named I. Nuttallii, 



About the same year Drummond collected "7. lactistris^' on 



to Hooker's Fl. !6or. Am. ii- 268, 



which I have not been able to compare and to identify. 

 1840. J. W. Robbins found 7. lacustris near Uxbridge, 

 1843. Rugel discovered 7m Isoetes in Lakelmonia in Florida, 

 which was soon afterwards distributed in Europe by Shuttleworth 

 under the name of I. flaccida. None of his specimens are be- 

 lieved to exist in America. 



In the same year N. Riehl and myself found near St. Louis, 

 Missouri, the species which from my specimens was by A.Braun 



named I, Engelmanni. 



1843. Chas. Geyer found in Western Idaho 7 NuttalUi, ac- 

 cording to A. Braun, who examined the specimens in the Kew 



Herbarium. 



In the same year S. Tuckerman collected 7 lacustris in the 



Echo lake in New Hamp^ire. 



1S44. Wm. Zantzinger rediscovered the Isoetes on the banks 

 of the Delaware near Philadelphia. His specimens, sent to me, 

 are the type of my I. riparia. 



1845. T. W. Robbins found in Massachusetts 7 echinospora^ 



vatr. Braunii. 



184S. E. Tuckermann discovered near Boston the species 



which was by A. Braun named for him I. Tuckermaxi. 



I 



