3^2] TKANS. ST. LOUIS ACAD. SCIENCE. ‘ , 5 
form of echinospora , either of which may be expected in those 
regions. 
1843. Torrey, Flora of New York, ii. 514, lacustris? a 
mere repetition of Pursh’s statement. 
1844 Bory investigates the Genus, which until then had been very 
much neglected, and adds to the three then known species (/. lacustris, 
Coromandelina , and setacea ) three new ones discovered in Algeria by 
Durieu de Maissonneuve. 
1846. A. Braun, in Regensburg bot. Zeitung, No. 12, briefly 
characterizes I. riparia,Engelm., from Philadelphia; I. Engel- 
manni , A. Br., from Missouri, and I. jlaccida, Shuttlew., from 
Florida. 
1847. The Amer. Journ. Arts & Sciences, n. ser, iii. 52, pub¬ 
lishes a translation of the above notice. 
1848. A. Gray, in the first edition of the Manual Bot. North. 
States, p. 640, distinguishes the then known three northern spe¬ 
cies, /. lacustris , /. riparia, and I. Engelmanni. 
1853. Darlington, FI. Cest. ed. ii. p. 402, mentions lacus¬ 
tris” as growing in shallow ponds in his district. This must refer 
to I. Engelmanni , the only species growing there in such lo¬ 
calities. 
1856. A. Gray, Manual, ed; ii., gives an almost verbal reprint 
of the first edition. 
1860. Chapman, Fl. South. States, p. 602, describes I. Jlac - 
cida as growing in ‘‘lakes and clear streams” in Middle and West 
Florida. 
In the same year E. Tatnall, Cat. PI. Newcastle Co., Delaware, 
-enumerates I. riparia and /. Engelmanni , both of which names 
here probably stand for the latter. 
1861. Durieu de Maisonneuve, Prof, of Botany at Bordeaux, in Bull. 
Soc. Bot. France, viii. p. 164, distinguishes and characterizes the two 
North European species /. lacustris and /. echinospora, heretofore thrown 
together. 
1864. The same author, 1 . c. 101, 102, indicates four Ameri¬ 
can Isoetes: muricata from Massachusetts, Braunii from New 
Hampshire, macrospora from the Catskill Mountains, and mela- 
nopoda Gay (or Gay and Durieu) from Illinois. 
In the same year A. Braun published a most important treatise on the 
Genus in his account of the Isoetes of the Island of Sardinia, in which our 
-species are frequently referred to. 
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