1909. No.8. VASCULAR PLANTS COLLECTED IN ARCTIC NORTH AMERICA. 47 
Papaveraceae. 
Papaver L. 
44. Papaver radicatum RoTTBÖLL, Skr. Kiöbenhavn Selsk. Lærd. & 
Vidensk., 10, 1770, P. 455, tab. 8, fig. 24; P. nudicaule Hooker, Fl. Bor. 
Am., I, p. 34, 1829. 
P. nudicaule, PurLen's list, Point Barrow to Mackenzie River. 
King Point. In full flower on July 3rd, 1906. 
The specimens collected are slender, with much divided leaves whose 
segments are narrow; the slender scape has more or less adpressed hairs; 
petals saffron; capsule short and broad. 
Herschell Isl. In full flower on July 13th, 1906. 
Differs much from the plant from King Point, but has more resem- 
blance to the form common in Arctic Europe, Iceland and Greenland. 
The specimens are coarse, leaves much divided with broader segments; 
scape ca. 20 cm. high and stout with more distant and more numerous 
hairs; petals yellow; capsule short and broad. 
None of the forms has anything to do with P. Macounii GREENE 
(Pittonia, III, p. 247) from the Pribiloff Islands; but H. G. Simmons (I. c.) 
is certainely right in saying that there may be several species at present 
named P. radicatum. On the other hand this question has been much 
more troublesome just now after the publishing of the many new forms 
created by F. FEDDE (Papaveraceæ, Das Pflanzenreich, 1910). 
Cruciferae. 
Thlaspi L. 
45. Thlaspi alpestre L., var. purpurascens (RYDB.) m.; 7. purpurascens 
RYDBERG, Bull. Torr. Botan. Club., 28, 1901, p. 281. (See pl. III, fig. 17.) 
King Point. Flowering specimens in the last week of June 1906 
(20th—28th). 
Herschell Isl. Flowering on July 18th, 1906, and with year- 
old pods. 
The North American forms of the polymorphous T. alpestre differ in 
some respects from the European one! and should perhaps bear special 
names, as P. A. RYDBERG (l. c.) has suggested; but at present it seems 
to me better to treat them as varieties until further researches have de- 
cided the question on the specific range. 
Our specimens agree in the main with RyDBEerG's 7. purpurascens 
described from Arizona and Colorado. 
1 Rypsere (I. c. p. 280) says: "T. alpestre which is not found in America”. 
