STEVENS: NoRTH DAKOTA PLANTS 105 
the aie ee that ihe break away readily, with a rounded 
base), and with a strong transverse apis rte on mm 
above the base. Glumes from half as long to nearly equalling 
the spikelet, strongly nerved, with about a dozen short teet 
on the keel* near the apex x which i is acute or obtuse, often bearing 
n awn 2-10 mm. long; margins of the glumes thin and translu- 
cent except toward the base where they are indurated, rounded 
usually slightly separated exteriorly and quite widely interiorly. 
A. Smithit Rydb. Spikelets not articulated (breaking away 
with a rough base) and only slightly impressed. lum 
about one-half as long as the i indistinctly nerved and 
without distinct teeth on the back; margins thin on lower third 
sein meee, 6: abruptly narrowed to a long stiff, acumin- 
ate poi 
A. tenerum Vasey. Spikelets not articulated and only 
slightly impressed, Glumes about equalling the spikelets, acute, 
strongly nerved, the nerves all rough with small teeth, margins 
nearly straight. 
+ AGROPYRON DASysTACHUM (Hook.) Scribn. A specimen 
from Bottineau, July 7, 1920, is referred here (“form which has 
been called subvillosum”’) by Hitchcock. Bowman, June, 30 
- 1918, and Kenmare, July 15, 1913, are the same, and I think 
all the specimens previously referred to A. molle (excepting 
perhaps Bell 385) belong here. 
+ Dryopteris THELYPTERIS (L.) A. Gray. Anselm, R. A. 
Shunk 
+ DRYOPTERIS SPINULOSA (Retz.) Kuntze. Another speci- 
men of the same collection as the preceding seems to belong here, 
as does also Walhalla, Bergman 2000. 
Since the above was written I have received from Mr. F. P. 
Metcalf a reprint of an article (Jour. Washington Acad. Sci. 10: 
188-198. 1920) in which he reports eighteen additional species for 
the state. Several of the records suggest the probability of an 
error of indentification or of a difference in interpretation. In 
reply to my inquiry regarding a few of them Dr. Standley 
wrote that he has been able to find but one of the specimens, 
Rumex Britannica L. (McLean County), and that that seemed 
to be correctly determined. 
* This is not actually the central nerve, the broader part of the glume being 
exterior and only one or two nerves on the side next the rachis. 
