The Botany of Iceland - 01.12.1942, Qupperneq 53

THE TARAXAC.UM-FLORA OF ICELAND
279
Localities: Flatey in Breiðifjörður, 10.VII.1935 (the plant much larger). W.—
Siglufjörður, 14.VII.1935, Varmahlíð, 18.VII.1937, plentiful, fr., phot. N.
36. Taraxacum pravicentrum M.P.Chr. n. sp.
Spec. orig.: Iceland, Blönduós, 14.VII.1937, leg. M. P. Christiansen. Plate III,
fig. 36. Plate XXIII, fig. 154.
Planta 15—30 cm alta. Folia sat obscure viridia, lutescentia, glabra—parce
araneosa, petiolis pallidis—roseo-marginatis, nervo mediano brunneo-purpureo. Folia
exteriora longa, lingulata, 2—3-loba, lobis e basi latissimis, apice patenti-incurvis,
acutis, superioribus integris, inferioribus dentatis, lobo terminali brevi, triangulari-
cordato—sagittato-hastato, mucronato. Folia intermedia + integra, c. 3-dentata, lobo
terminali longo, saepe obliquo, ovato-sagittato, saepe integro, breviter acuto.
Involucrum ovatum, basi truncatum, obscure viride, pruinosum. Squamae
exteriores erecto-patentes—laxe patentes, 2.0—3.5 X 10—12 mm, subtus olivaceo-
virides—brunneo-olivaceae, leviter claro-marginatae, apice sat obscuro, supra glau-
cescentes + purpurascentes.
Calathium c. 50 mm latum, sat radians—radians, sat obscure luteum. Ligulae
marginales planae, c. 2.5 X 20 mm, subtus stria cano- vel obscuro-purpurea notatae,
dentibus longis, planis.
Antherae luteae, polliniferae.
Stylus superne virescens. Stigmata virescentia, subtus fusco-virescentia.
Achenium c. 4.2 mm longum, 1.2—1.3 mm latum, superne parce, minute erecto-
spinulosum, ceterum laeve, in pyramidem late conicam, 0.3—0.4 mm longam sensim
abiens. Rostrum c. 9 mm longum.
T. pravicentrum is recognisable by its scalloped, somewhat dark-green leaves with
+ purple-coloured midnerve and about two high, short, entire—few-toothed lobes
and short—long, often distorted terminal lobe. As to the shape of the leaf it is
somewhat reminiscent of T. planifrons, but differs from that species by the darker
colour of the leaves, the more coloured midnerve, irregularly lobed leaf and often
long and very distorted, untoothed terminal lobe. The pyramid on the achene of the
latter is somewhat longer.
It is spontaneous.
Habitat: The banks of rivulet, ditches, wet meadows.
Localities: Þingvellir, 7.VII.1935. S.W.—Hreðavatn, 13.VII.1937, Flatey ! in
Breiðifjörður, 10.VII.1935. W.—Bílðudalur, 11.VII.1935, Isafjörður, 12.VII.1935,
Flateyri in Önundarfjörður l.VIII.1937. N.W.—Blönduós, 15.VII.1937, plentiful,
fr., phot., Varmahlíð, 19.VII.1937, Víðimýri !, 19.VII.1937, Siglufjörður, 14.VII.
1935 and 30.VII.1937, Bakkasel, 20.VII.1937, Reykjahlíð at Mývatn, 22.VII.1937.
N.—Hallormsstaður, 24.VII.1935. E.
Geogr. Distr. : Found, outside Iceland, in Norway.
37. Taraxacum acidotum M.P.Chr. n. sp.
Spec. orig.: Iceland, Siglufjörður, 14.VII.1935, leg. M. P. Christiansen. Plate III,
fig. 37. Plate XII, fig. 121.
Planta gracilis—mediocris, 12—30 cm alta. Folia lutescentia—sat laete cano-
viridia, lanceolata—sat late lanceolata, profunde 2—4-loba, petiolis pallidis, nervo
mediano pallido, lobis fol. exteriorum approximatis, latissimis, deltoideis, patentibus
vel leviter hamatis, acuminatis, antice subulato-dentatis, intermediorum et interiorum
sat distantibus, basin versus latis vel gradatim in interlobia transeuntibus et in
apicem angustum—linearem, patentem—parce hamatum, acuminatum attenuatis,
19*