pia = 
VASCULAR PLANTS OF NORTH DAKOTA 163 
Alisma arcuatum lanceolatum (Buchenau) Lnell, Bot. Gaz. 
aa. 24a, (1907))s 
Alisma Plantago (aquatica) arcuatum lanceolatum Buch. in 
Engler, Pflanzenreich IV. 15, p. 14, (1903). 
Leeds, Butte. 
37. Alisma Geyeri pumilum (Prahl) Lunell. 
Alisma arcuatum pumilum Prahl in Kritische Flora 2: 204, 
(1890). 
Alisma Plantago (aquatica) var. pumilum Nolte in Sched.; 
Sonder, Flor. Hamb. 210, (1851). 
Rare. Bottineau along Oak Creek, Leeds. 
38. Alisma Geyeri angustissimum (Aschers. et Graebn.) 
Lunell, Bull. Leeds Herb, 2: p..5, (1908). 
Alisma arcuatum angustissimum (Aschers. et Graebn,) Lunell, 
Bates GaZtAa, op) 2 Wl.) (G07), 
Alisma Plantago (aquatica) arcuatum angustissimum. Aschers, 
et Graebn. Synops, Mitteleur, Flora 384, (1898). 
Leeds, York. 
39. Alisma Geyeri giganteum Junell, var. nov. 
Phyllodia 5-7 mm. lata, linearia, phyllodiis varietatis praece- 
dentis duplo longiora. Ubi superficiem rivuli attingunt, extremi- 
tates in folia lanceolata, 6-10 cm. longa, 1 cm. lata transmutantur. 
Phyllodia 5-7 mm. wide, linear, twice as long as in the pre- 
ceding variety. There exists in the phyllodia a strong tendency, 
a tendency to get to the surface of the water, to reach 
“a place in the sun,’ and if they succeed, their ends become 
leaves, lanceolate, 6-10 cm. long and 1 cm. wide. 
A large plant, rare. Collected by the writer on July 18, 1906 
in running water at Leeds. Extinct in the type locality. 
40. Alisma subcordatum Rafinesque, in the Medical Repos- 
Mony, exade 2, -vol.5:)'p.362,- (1808): 
Alisma Plantago (aquatica) Linn., var. Michaletii Aschers, 
et Graebn., f. latefolium Aschers. et Graebn. Synops. Mitteleur. 
Biora, 1,383) (1898);, aud Bot; Gaz. 43, p:.27o (1907), in part. 
* We quote from the description of Rafinesque: ‘‘—radical 
leaves petioled, semi-cordate, very obtuse, flowers in a very loose 
panicle, verticillated by threes. Common almost all over the 
United States of America, where it is mistaken for the Alisma 
plantago of Europe, which is widely different, having quite lan- 
ceolated leaves, very acute.” 
