ce t emis ae T I C ee 
NEW PLANTS FROM NORTH DAKOTA 233 
GENUS UNIO RETZIUS, 1788. 
25. Unio ata Lamarck, 1819. 
urs rather sparingly in the Wapsipinicon at In- 
e sg Hitherto reported only from the Iowa 
and Mississippi rivers. 
26. Unio gibbosus Barnes, 1823. 
epresented by numerous specimens from the Wap- 
sipinicon. 
GENUS QUADRULA RAFINESQUE, 1820. 
27. Qu. coccinea (Conrad, 1836) Baker, 1898. 
Occurs sparingly in uc Turkey, Wapsipinicon, and 
Volga drainage syste 
28. Qu. lachrymosa (Lea, 1828) Baker: 1898. 
ipinicon: 
29. Qu. plicata (Say, 1816) Baka 1898. 
very abundant in the Wapsipinicon. It is found in 
the Volga, nor have we seen any specimens from 
the Turkey. 
: SEET prai (Lea, 1831) Med, 1898. 
Wapsipinicon: rathe 
. rubiginosa (Lea, 1829) Baker, 1898, 
Wapsipinicon: 2 nos int ; also found in the Tur- 
key and Volga ri 
32. Qu. undulata (Barnes, 1823) Baker, 1898. 
This species occurs not rarely in the Wapsipinicon. 
It is readily distinguished from the closely related 
Qu. plicata by the greater inflation of the shell and 
prominence of the beaks in that species. 
inb we shell is rather compressed and the 
beaks a 
Independence, leave: 
May 30, 1910 
30. Q 
31. Q 
= 
= 
New Plants from North Dakota. Il. 
J. LUNELL. 
Gutierrezia Greenei sp. nov. 
Radix ligneus longitudine variabilis, plerumque autem 
x rn caudice crasso ligneo (uno vel duobus) caules protinus 
emittente, vel ramis plerisque ligneis e.superficie superiore 
licis oriundis, qui caules singulos usque quaternos a 
E 13 dm. alti, herbacei, scabri, in caudice confertissimi 
