1909. No. 8. VASCULAR PLANTS COLLECTED IN ARCTIC NORTH AMERICA. 9 
Polygonaceae. 
Oxyria Hi. 
24. Oxyria digyna (L.) Hu, Hort. Kew., 1768; Macoux, Catalogue 
Ill, 1886, p. 414; O. reniformis Hooker, Fl. Bor. Am. II, 1838, p. 129. 
Rar, Wollaston-Victoria Land. — WAaLker, Boothia Felix. 
In flower and with unripe fruits on July 31st 1904 and Aug. 3rd 1905. 
Polygonum L. 
25. Polygonum viviparum L., Sp. pl. 1753, p- 360; Hooker, Fl. Bor. 
Am. II, 1838, p. 130; Macoun, Catalogue III, 1886, p. 412. 
Wazxer, Boothia Felix. — Rar, Wollaston-Victoria Land. 
Specimens with bulbils only (no flower developed) in the spikes were 
collected on July 31st 1904 and Aug. 5th 1905; leaves hairy on the 
under side. 
Caryophyllaceae. 
Melandrium Rörı. 
26. Melandrium apetalum (L.) Fenzı, in Leves., Fl. Ross., I, p. 326, 
1842; Lychnis apetala L., Sp. pl, 1753, p. 626; Hooker, Fl. Bor. Am. I, 
p. 91, 1830 (a); Macoun, Catalogue I, 1883, p. 68. 
WALkER, Boothia Felix. 
The specimens have petals projecting above the calyx and may thus be 
identified with f. arctica Tu. Fries (Öfv. K. Sv. Vet. Akad., 1869, p. 133). 
They were near the end of flowering on Aug. 2nd, 1905. 
Silene L. 
27. Silene acaulis L., Sp. pl., ed. 2, 1762, p. 603; Hooker, Fl. Bor. 
Am., I, 1830, p. 87; Macoun, Catalogue I, 1883, p. 68. 
Wa ker, Boothia Felix. 
Flowering specimens were collected in July (17th— 31st) of 1904 and 
of 1905. The white-flowered form was also found. 
F. VIERHAPPER has shown that Silene acaulis L. in the Central- 
European mountains occurs in several geographical races and points out 
(Verhandl. zool. bot. Ges. Wien, vol. 50, 1901, p. 564) that even within 
its northern circumpolar area it can possibly be splitted into several races, 
but I do not lay much stress upon trying this, as I feel convinced that 
the so-called races will be very difficult to separate from each other. 
