The Botany of Iceland - 01.12.1949, Qupperneq 51

THE FLORA OF REYKJANES PENINSULA
49
197. Loiseleuria procumbens L. (Desv.) (1813) 35.
8—430 m.
Scattered. Kúadalur (Grönlund); Seltjörn 8 m; fl. 15. VI. 37; Geitahlíð 296
m; W-Plateau 430 m; Kolviðarhóll 420 m; Almenningur 80 m; Háaleiti
35—55 m; Kerlingarskarð 300 m; Krísuvík 170 m.
Vacciniaceae.
198. Vaccinium Myrtillus L., Sp. pl. (1753) 349.
100—590 m.
Frequent, especially in the highland, in the community of Empetreto-Vac-
cinietum.
In snow-patches mostly in the f. pygmaea Ostf. It is sometimes difficult to
settle, whether such forms are genetically fixed or merely an accomodation to
the direct insolation or to an enormous transpiration. Such a form was
described by Otruba (Sbor. Klubu prír. v Brné za r. 1927, Brno 1928, pl. 70)
from Moravia as f. microphyllum Otruba: folia parvula vix 0.5—1.5 cm
longa. Rohlena (Véda prírodní 18:7:209) describes a form from Central
Bohemia with 4—9 mm long and 3—5 mm broad leaves; they are about as
large as the Icelandic p}'gmaeous forms.
Normal, broadleaved forms of V. Myrtillus may be found on Reykjanes only
in the shadow of the copses or in lava fissures. Both forms have numerous
transitional forms as e. g.: a form from Gullkistugjá 120 m, 21. VII. 37 in a
lava fissure, 5 m deep: leaves (7)—14.6 (20 mm) broad, (12)—27.3—(39.5)
mm long (average from 30 speciment); Grindaskarð 300 m, snow patch, SW
exposition, 23. VII. 37: transition to the microphyllous form: leaves (5)—7—
(10) mm broad, (7)—9.4—(13 mm) long (average from 20 samples).
Hafnarfjörður (Solander), Vogshús (Mörch), Geitahlíð 200—310 m; Gull-
kistugjá 120 m, fl. 21. VII. 37; Hólmshraun 115 m; Selfjall 240 m; Rjúpna-
dalshnukur 330 m; W-Plateau 580—590 m; Geitafjall 500 m; fr. 14. VIII. 36;
Kolviðarhóll 420 m; Kleifarvatn 160 m; Kaplatóur 155 m; Kaldársel 100 m;
Sveifluháls 100 m; Kerlingarskarð 300 m; fl. 23. VII. 37; Búrfell 120 m, fr.
22. VII. 37; Hvammahraun 140 m; Vatnshlíð 200 m; Breiðdalur 240 m.
199. Vaccinium uliginosum L., Sp. pl. (1753) 350.
10—574 m.
Frequent. Visited by humblebees (Hvammahraun 150 m, 17. VII. 37). Hafnar-
fjörður (Lyngbye), Kúadalur (Grönlund), Hólmshraun 115 m; Skálafell 574 m;
Vífilsfell 308 m; W-Plateau 460 m; Snorrastaðatjörn 12 m; Cape Reykjanes
20 m; Merkines 10 m; Geitafjall 500 m; Búrfell 130 m; Hvammahraun 140
m, fl. 19. VII. 37; Kerlingarskarð 300 m, etc.
Plumbaginaceae.
200. Armeria maritima (Miller 1768) Willd. 1809.
o—685 m.
Common. Flowers closed in rain. One average individual with a cushion
about 10—25 cm 'n diameter has ca. 20 scapes, each scape ca. (14)—29—-(38)
flowers (average from 15 samples), altogether ca. 560 flowers and diaspores.
The Botany of Iceland. Vol. V. Part I. 7