THE NOMENCLATURE OF POTAMOGETONS. 151. 
are exceptions to this. Sometimes this is misnamed acutifolius, 
but these two plants are easily separated, even Dy single leaves. 
ANGUSTIFOLIUS Presl. (P. Zizi Fag hs r. Mersyensis mihi 
un, ite Methye Lake, north of Buffalo Lake, lat. 
Scaeaay to the shores of the Arctic Sea. D m any form 
of the type in America or Europe y he long narrow middle 
leaves; the upper leaves are oval, semi-coriaceous, with lon 
stipules, combining the habit of Prifalige Gay, and the lucens, 
No. 607 of the Herb. Fl. Ingrice; fruit smaller, and the embryo 
more evel 
be s L., var. ELoncatus mihi, Macoun’s Cat. of Canadian 
Plants, ae +. Pp. 871 (1890).—This differs from pusillus by the larger 
e of all its parts, very long internodes, leaves remarkably 
Sainte’ peduncles stout and long, spikes much longer, the leaves 
are often quite acute, flowers larger in all their parts. Habit of 
rutilus bist and so named in specimens from Hungary in 
Herb. Mus. Bri One can understand Dr. Richter’s having 
referred such a ‘Salt as this to rutilus (to include Friesii), as he 
does in his ‘ Plante Europex,’ 1890, p. 15. Spallumsheen River, 
at and above Enderby, British Columbia, 1889. J. M.Macoun! 
ACUMINATUS Sc. ee En. pl. Saell. p. 49 (1801).—This in our 
Floras is named P. lucens L. var. acuminatus Schum., sometimes 
within tik its ite first ~oe ge as a. ni ob e seems 
due to Fries, in the first edition of his Nov . Suec, 
references to the iy: I 
P. lucens var. acuminatus Fries, l. c. p. 46 (1816). 
Pe. ib ote Fl. Cech. p. 87 (1819 
ucens 8. macrophyllus Wallr. Sch. crit. i. 65 (1822), 
P. seats Besser, En. Pl. Volhy. p. er aaa 
ri oar Seidl. Opiz. Boh. Gew. p. 23 (1823). 
P. lucens L., var. diversifolius Mer. et Koch, Deut. Fl. p. 849, 
1823 a "Fieber): 
P. lucens B. cornutus Presl. Kosteletzky, Cl. Anal. Fl. Boh. p. 24, 
1824. 
P. lucens a. corniculatus Meyer, Chl. Hann. p. 522 (1836). 
P. corniculatus Schur. En. Pl. Trans. p. 683. (1868). 
P. covonatus Hornem. Fl. Danica, fase. 25, t. 1449 bp ey 
seems Oe te to point m3 that as Dr. quist, in the 1 
edition of Hartman’s Hand. i. Skan. Fl. (1890), uses the 4 ho 
tag jlantagjineic Du Croz (1818), he has evidently been misled by 
the date 1823 being printed on the first page o. “Font 25 he the 
‘Flora Danica.’ This is, however, a misprint, as can be s 'y 
referring to the other fascicles in the volume, ohare tis date 2 1818 
oceurs after the misprint 1823. Dr. Lange correctly gives the date 
in his Nomencl. Fl. Danice, yet has the same error as Dr. Almquist 
in his Hand. i. den Danske Flora. 
It is a curious fact that Hornemann did not know the plant he 
published ; specimens so named by him are polygonifolius!. -Hoff- 
