The Botany of Iceland - 01.12.1949, Qupperneq 18

ENUMERATION OFVASCULAR PLANTS
AND THEIR DISTRIBUTION
Pteridophyta.
Equisetaceae.
1. Equisetum arvense L. Sp. pl. (1753) 1061 var. boreale (Bongard)
Rupr. (1845) 19.
1— 600 m.
Common in the area investigatcd. Fertile in June.
Krísuvík (Steenstrup); Seltjörn, 7 m, fertile 15. VI. 37; Stóri Ny'ibær, 135 m,
fert. 21. VI. 37; Sveifluháls, 270 m; Kleifarvatn, ijj m; Stakkavík, 120 m;
Hvaleyarvatn, 40 m; Cape Reykjanes, 35 m; Ncs, 15 m; Vogsósar, 2 m;
Leirdalur, 180 m; Logberg, 145 m; Vogavík, 1 m; (Hengill, 600 m).
2. Equisetum fluviatile L. (1753) ampl. Ehrhart 1787.
i3í—137 m.
In shallow standing water; rare.
Geitháls (S. O. F. Omang); Krísuvíkurdalur, 135—137 m.
3. Equisetum hyemale L. Sp. pl. (1753) 1062.
150—222 m.
Rare; in the Empctrcto-Vaccinictum, Callunetum or other heath communities.
Hafnarfjörður (Solander); at Grindavík (Thoroddscn); Syðri Stapi, 180 m;
Hvammahraun, 150 m; Hclgafell, 160—180 m; on the eastern slope near Sand-
fell at Vífilsfell, 222 m.
4. Equisetum palustre L., Sp. pl. (1753) 1061.
99—310 m.
In bogs of the lowland; frequent.
Krísuvík, 135 m; Krokamýri, 200 m; fcrtilc 30. VI. 37; Sveifluháls, 240 m; etc.
j. Equisetum pratense Ehrh., Hannov. Magaz. (1784) 138. f. nana
Milde.
2— 320 m.
In coppiccs and hcath communities; frequcnt. A lowland plant, rarc in moun-
tains. The form from thc area investigated has smooth, 7—9angular stems
(cf. Hadaé 1938).
Kúadalur( Grönlund); Kolviðarhóll, 380 m; Djúpavatn, 290 m; Sveifluháls,
235 m; Krókamýri, 200 m; Búrfcll, 143 m; Kaldárscl, 100 m; Seljahlíð, 100 m;