The Botany of Iceland - 01.12.1942, Page 81

THE TARAXACUM-FLORA OF ICELAND
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Habitat: Home-fields, banks of rivulets.
Localities: Múlakot, 5.VII.1937, fr., phot, Vestmannaeyjar, 5.VII.1935. S.—
Hafnarfjörður, l.VII.1937. S.W.—-Hreðavatn, 13.VII.1937. W.
Geogr. Distr.: Only found in Iceland.
75. Taraxacum atroglaucum M.P.Chr. n. sp.
Spec. orig.: Iceland, Varmahlíð, 18.VII.1937, leg. M. P. Christiansen.—T.
pseudonaevosum Dahlst., in Medd. om Gronland, LXXVII, 23 (1930), nomen, per-
haps is identical.—M.P.Chr.: Plate VII, fig. 75. Plate XXXIII, fig. 183.
Planta robusta, 25—4-0 cm alta. Folia crassa, atroglauca, paulo lutescentia, sat
dense purpureo-maculata, + araneosa, obovato-lanceolata—lingulato-lanceolata, nunc
integra et breviter et late dentata, margine inter dentes concavo, + denticulato, nunc
parum profunde lobata, petiolis sat latis—angustis, pallidis— + purpureis, nervo
mediano + brunneo-purpureo, lobis c. 4 utrinque, approximatis, brevibus, patentibus
—parce incurvis, breviter acutis, + subulato-dentatis, lobo terminali sat magno,
ovato-sagittato vel hastato, obtuso—mucronato.
Involucrum basi truncatum. Squamae exteriores + recurvatae, 5—2 X 8—12
mm, subtus olivaceo-virides, supra albo-virides, pruinosae, incoloratae.
Calathium 50 mm latum, planum, valde radians, obscure luteum. Ligulae mar-
ginales 3 X 21 mm, subtus stria cana—cano-rosea notatae.
Antherae saepe croceo-purpureae, leviter polliniferae.
Stigmata lutea—leviter virescentia.
Achenium fusco-stramineum (153—154), c. 3.3 mm longum, c. 1.1—1.2 mm
latum, superne dense, longe, acute incurvo-spinulosum, ceterum tuberculatum—laeve,
in pyramidem cylindricam, 0.9—1.0 mm longam, inferne saepe spinulosam abiens.
Rostrum 7—8 mm longum.
T. atroglaucum has dark bluish-green, purple-spotted, entire and coarsely den-
tate—shallow-lobed and regularly lobed leaves, dark heads and fruit with long spines
at top. It seems to be closely relatcd to T. brevilobum and T. galeiþotens. The latter,
however, is easily distinguished by its multifid leaves with narrow points to the
lobes, whereas the former has + remotely placed lobes, especially on the inner
leaves. After flowering T. atroglaucum gets entire leaves with densely dentate
margins, T. brevilobum + lobed leaves.
Habitat: Grassy mountain-slopes, rock-ledges, etc.
Localities: Varmahlíð, 20.VII.1937, plentiful, fr., phot. N.—Brekka, 21.VII.
1935. E.
Geogr. Distr.: Found, outside Iceland, in Greenland (?) : T. þseudonaevosum
Dahlst. n. sp. (det. 1926, H. Dahlstedt), “Uiluvit”, Tasermiut bay, 60° 28' N.,
28.VII.1925 (A. E. Porsild and M. P. Porsild), Kangikitsoq qingua, Ilua Fiord,
60° 18' N., 27.VII.1925 (A. E. Porsild and M. P. Porsild).
76. Taraxacum galeipotens M.P.Chr. n. sp.
Spec. orig.: Iceland, Breiðabólsstaður, 9.VII.1937, leg. M. P. Christiansen. Plate
VII, fig. 76. Plate XXXIV, fig. 188.
Planta 25—40 cm alta. Folia obscure glauco- et sat intense lutescenti-viridia,
valde araneosa, dense purpureo-maculata, lanceolata, profunde lobata, petiolis sat
latis—angustis, roseis—obscure brunneo-purpureis, nervo mediano + purpureo-brun-
neo, lobis 4—8 utrinque, deltoideis, longis, sat reflexis—hamatis, breviter—-longe
acuminatis vel basin versus latis, et in apicem abruptum, angustum, incurvum
attenuatis, superioribus antice saepe lobo cum lobulis lateralibus parellelo instructis,