4 ENGELMANN—THE GENUS ISOETES IN N. AMERICA. [361 
1875. G. D. Butler discovered in the Indian Territory the spe¬ 
cies named for him I. Butleri, and with it a new locality for 
I. melanopoda . 
1878. C. G. Pringle found in Lake Champlain the form of I. 
echinospora , which I have designated as var. robusta. 
1879. E. Jones met with /. Bolanderi in Utah. 
1880. A. Gattinger discovered near Nashville, Tennessee, a 
I. Butleri , var. immaculata. 
1881. I collected I. lacustris var. paupercula in Grand 
Lake, Middle Park, Colorado, and C. G. Pringle found the same 
in Northern California. 
2 . PUBLICATION. 
1753. ’ Linnaeus published in his Species Plantaruin, ed. i., his Isoetes- 
lacustris, the only species known to him. 
Neither Michaux nor any of the older writers on American 
plants knew of any North American Isoetes. 
1816. Pursh, FI. Am. Sept. ii. 671, mentions u I. lacustris ” 
from Oswego river, Western New York, which is most probably 
/. echinospora , var. Braunii , the only Species thus far known 
from that region. 
1818. Nuttall, Gen. ii. 253, has “I. lacustris” from the miry 
shores of the Delaware near Philadelphia, which cannot be any 
other than /. riparia ; he also gives Pursh’s habitat. 
In the same year Barton, FI. Philad. ii. 213, has li J. lacustris” 
from Philadelphia, which may include both I. riparia and I. 
Engelmanni. 
1824. Elliott knows no Isoetes . 
1826. Torrey (Comp. FI. North. & Middle States) gives as 
habitat of “615, I. lacustris ” bottoms of lakes, evidently without 
having himself seen it. 
In the Flora Cestrica of the same year Darlington does not 
mention the genus. 
1827. Sprengel, Syst. Plant, iv. 9, knows only I. lacustris with three 
varieties. . 
1833. Beck in his Botany repeats Pursh’s and Nuttall’s lo¬ 
calities, 
1840. Hooker, FI. Bor. Am. ii. 268, mentions “ I. lacustris” 
from the Saskatchawan. This may be the true lacustris ox a 
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