STEVENS: NortH DAKOTA PLANTS 99 
PHLOX 
Following the treatment of the western forms by E Nelson 
(Ninth Rept. Wyoming Agr. College, 1899), our plants would 
seem to be separated more satisfactorily as follows: 
Leaves 5-10 mm. long; flowering stems one-flowered. P. Hoodii. 
Leaves 1-2 cm. long; flowering stems two-to several- flowered: more up- 
right, the bark peeling off in shreds. P. andicola. 
PHLOX ANDICOLA (Britton) E. Nelson. P. Douglasii of 
Bergman’s Flora, in part. This seems to be better separated 
from P. Hoodii Rich. by the above characters than by the size 
of the flowers. The Medora and Washburn specimens referred 
by Bergman to P. Douglasii Hook. are evidently P. Hoodii. 
+ LappuLA CENCHRUSOIDES A. Nels. Marmarth, July 4, 
1918, in sandy soil of river valley. Habit of growth similar to 
L. occidentalis (Wats.) Greene, nutlets similar to those of L. 
Lappula (L.) Karst. but larger, the spines longer, and with a row 
of elongated tubercles on the middle of the back of the nutlets. 
The following, previously referred to L. Lappula, also belong 
here: Medora, Bergman 1276; same locality, June 19, 1910; 
Williston, Bell 25. 
{+ LappuLA CUPULATA FOLIOSA (A. Nels.) Nels. & Macbr. 
Marmarth, same as preceding. Often three of the nutlets of 
a flower have the spines confluent, forming a spreading border, 
the fourth nutlet with simple spines. In the specimens col- 
lected, however, there seems a decided tendency for the spines 
to be simple on all nutlets of the lower flowers. There are also 
nutlets with spines of intermediate form, broadened but not 
united. Counts on three plants show nutlets as follows: 
Plant No. 1—8o united, 71 simple, 40 intermediate; 
Plant No. 2—61 united, 106 simple, 34 intermediate; 
Plant No. 3—47 united, 47 simple, 14 intermediate. 
The color of the corolla is an uncertain character, white 
flowers often appearing bluish in the dried specimens. 
7+ LAPPULA TEXANA HOMOSPERMA (A. Nels.) Nels. & Macbr. 
Marmarth, same as preceding, occasional plants in patches of 
L. occidentalis, all plants dried up and only fruits collected. 
From a planting of fruits the following season about twenty-five 
plants of L. occidentalis were obtained from fruits of that species. 
No plants were secured from the few fruits of the other two 
species. 
+ LAPPULA FLORIBUNDA (Lehm.) Greene. Lake Ibsen (Leeds) 
July 4 and 17, 1914, Lunell; Pleasant Lake, June 29, 1920. 
