The Botany of Iceland - 01.12.1942, Side 77

THE TARAXACUM-FLORA OF ICELAND
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from the other species in the group by its thin, almost smooth leaves, and it seems
to form a transition to the Crocea-species with strongly coloured midnerve. However,
it seems to me more nearly allied to T. skutustadirense, see the latter.
It is no doubt spontaneous.
Habitat: Birch-copses, lava-fields, mountain-slopes.
Localities: Skútustaðir, 28.VII.1935, Reykjahlíð at Mývatn, 25.VII.1937, Laugar
at Breiðamýri, 27.VII.1937, Vaglaskógur in Fnjóskadalur, 16.VII.1935 and 23.VII.
1937, plentiful, fr., phot. N.
Geogr. Distr.: Only found in Iceland.
f. Naevosa M.P.Chr. n. sect.
(,Spectabilia Dahlst. p. p.).
Plantae mediocres—sat magnae, saepe robustae. Folia compacta, crassa, laete
canescenti-viridia, atro-viridia vel glauco-viridia, saepe purpureo-maculata, vulgo
valde araneosa, raro fere glabra, saepe profunde. lobata; petioli lati—angusti,
pallidi— + colorati. Squamae involucri exteriores saepe longae, patentes—diver-
gentes, raro erecto-patentes, + olivaceo-virides, laeves (vel haud callosae). Calathium
mediocre, laete—-obscure luteum, sat planum, + radians; ligulae marginales subtus
stria cana—cano-violacea, raro roseo-purpurea notatae. Antherae polliniferae, raro
polline carentes. Achenia 3.5—5.0 mm, saepe 4.3 mm longa (pyramide inclusa),
brunnescentia—brunnea, raro rubro-lateritia, superne saepe valde spinulosa ; pyramide
longa et saepe cylindrica, rostro 7—11 (raro 12—14) mm longo.
Key.
Eu-Naevosa.
a. Maculata. Upper surface of leaves + blotched with purple.
b. Fruits greyish-brown—brown, sometimes with a reddish tint.
c. Petioles pale. Midnerve pale—slightly brownish.
d. Leaves with 4—7 side-lobes .
e. Leaves yellowish-green, narrowly lanceolatae—lanceolate. Lobes closely placed
with + abrupt, patent—slightly reflexed point and a single coarse tooth at
the upper edge.
72. T. pardinum M.P.Chr.
ee. Leaves greyish-green—bluish-green.
(See 79. T. asperum and 80. T. mucroniferum).
dd. Leaves entire or with 2—4 side-lobes.
e. Terminal lobe of leaves short, hastate. Fruit at the summit with small, stubby
warts. Leaves pale-green—greyish-green, obovoid-lanceolate, entire—lobed.
73. T. brevihastatum M.P.Chr.
ee. Terminal lobe of leaves + long, ovoid with short, somewhat patent, obtuse
basal-lobes and obtuse—rounded middle lobe. Above the basal-lobes entire—
slightly dentate. Outer bracts numerous.
74. T. subpardinum M.P.Chr.
cc. Petioles and midnerve + purple-coloured.
d. Leaves entire and dentate—shallow-lobed, obovoid-lanceolate—lingulate-lan-
ceolate, dark bluish-green, strongly blotched with purple.
75. T. atroglaucum M.P.Chr.
dd. Leaves + deeply lobed.
e. Leaves with 4—7 side-lobes.