STEVENS: NORTH DAKOTA PLANTS 103 
Lactuca virosA L. Many European authors describe this 
as having horizontal leaves and black, broadly margined akenes. 
This does not apply to our plants. The pinnatifid-leaved form 
is only occasional in the state (Kulm, Brenckle 782; Bottineau, 
July 23, 1918; Fargo, Aug. 17,1920). Pammel’s notes (Rhodora 
20: 180-181. 1918) on the replacement of the entire-leaved form 
by the pinnatifid in Iowa suggest that it will be interesting to 
watch for a similar case here. 
7 CREPIS OCCIDENTALIS: Nutt. Bowman, June 23, 1918. 
Quite common on Twin Buttes. 
+ CREPIS CAPILLARIS Roth. Fargo, Aug. 26, 1920; Willow 
City, F. M. Rich. 
} SPIRODELA POLYRHIZA (L). Schleid. Fargo, Aug. 30, 1919, 
a few plants among masses of Lemna. 
+ CYPERUS DIANDRUS Torr. Anselm, Aug. 1916, R. A. Shunk. 
{+ CYPERUS ESCULENTUS L. Fargo, Oct. 2, 1920. 
ScIRPUS VALIDUS Vahl. I cannot support Bergman’s separa- 
tion of most of our material as S. occidentalis (Wats.) Chase. 
There do seem to be two forms present, one with spikelets as 
figured in Gray’s Manual (ed. 7, f. 290), the other with more 
rigid panicles and longer spikelets. The specimens, however, do 
not match Bergman’s separation. Both of these forms were 
found in a small patch at Oakes on July 18, 1919, the first 
occupying a definite part of the patch. Specimens of each were 
identified by Agnes Chase as S. validus. 
CAREX OBTUSATA Liljebe. Verified by Standley. Fargo, 
June 24, 1920. Quite abundant, at least in one place in low 
prairie. Kensal, Bergman, 1744, is alsothis in stead of C. 
_ stenophylla Wahlenb. 
The following additional species of Carex were recorded by 
Lunell (Am. Mid. Nat. 3: 234-237. 1916) from specimens deter- 
mined by Mackenzie: C. Hookeriana Dewey, C. athrostachya 
Olney, C. tenera Dewey, C. praticola Rydb., C. Emoryi esis 
C. scirpiformis Mackenzie, C. Parryana Dewey, C. laevic 
Dewey and C. atherodes Spreng. 
+ SYNTHERISMA SANGUINALE (L.) Dulac. Fargo, Oct. 2, 
1920. 
+ PANICUM PERLONGUM Nash. Verified by Hitchcock. 
Fargo, June 24, 1920. Very abundant in one place in low 
prairie. 
