The Botany of Iceland - 01.12.1942, Qupperneq 95

THE TARAXACUM-FLORA OF ICELAND
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Stigmata lutea—sat obscura.
Achenium c. 2.8 mm longum, c. 1.2 mm latum, supeme latius, longe, robuste
spinulosum, ceterum tuberculatum—laeve, in pyramidem anguste cylindricam, 0.8—
0.9 mm longam abiens. Rostrum c. 10 mm longum.
T. latifrons has broad, dark greyish-green, purple-spotted leaves; densely placed,
+ long, hamate lobes; short, galeate terminal lobes, dense heads and short and
thick fruits with a narrow pyramid.—The species cannot be mistaken for other
Icelandic species. It is, for the present, placed in the group Macrodonta, but it
seems rather isolated.
No doubt introduced.
Habitat: Road-sides.
Localities: Akureyri, l.VIII.1937, plentiful, fr., phot. N.
Geogr. Distr.: Only found in Iceland.
91. Taraxacum latihastatum M.P.Chr. n. sp.
Spec. orig. : Iceland, Húsadalur in Þórsmörk, 8.VII.1937, leg. M. P. Christiansen.
Plate VIII, fig. 91. Plate XXXX, fig. 205.
Planta mediocris, 20—30 cm alta. Folia saturate viridia, lutescentia, valde pur-
pureo-maculata et sat dense araneosa, obovato lanceolata—lanceolata, non profunde
lobata, petiolis latis, pallidis, nervo mediano pallido, lobis 3—4 utrinque, latis,
deltoideis, sensim in apicem patentem vel sat hamatum, angustum, subulato-acumina-
tum abeuntibus, antice valde subulato-dentatis, interlobiis brevibus, latis, + subulato-
dentatis, lobo terminali brevi, regulariter triangulari—sagittato-hastato, margine saepe
recto, integro, lobulis basalibus acutis.
Scapi dense araneosi, + brunnescentes.
Involucrum angustum et longum. Squamae exteriores laxe patentes—recurvatae,
lanceolatae—lineares, subtus olivaceo-virides, supra laete virides, apice purpureo.
Calathium sat obscure luteum, 50—60 mm latum, radians. Ligulae marginales
longissimae, c. 3 X 25 mm, subtus stria obscure purpurea notatae.
Anthera parce polliniferae.
Stigmata lutea—mellea.
Achenium fusco-stramineum—brunneum (153—129), c. 3.5 mm longum, c. 1.2
mm latum, superne sat crebre, robuste patenti-spinulosum, ceterum tuberculatum—
laeve, in pyramidem 0.6—0.8 mm longam, subcylindricam, basi interdum spinulosam
abiens. Rostrum 9—10 mm longum.
T. latihastatum has lanceolate, + yellowish-green, strongly purple-spotted leaves,
few, + narrowly deltoid, somewhat reflexed, acuminate lobes, hastate—triangular
terminal lobe, and large, radiating heads with long marginal ligulae,-—The species
seems to be closely related to T. rhomboideum, but the latter has few or no purple-
spots and intermediate leaves of a different shape.
Habitat: Grassy mountain-slopes.
Localities: Húsadalur in Þórsmörk, 8.VII.1937, fr., phot. S.
Geogr. Distr.: Only found in Iceland.
92. Taraxacum rhomboideum M.P.Chr. n. sp.
Spec. orig. : Iceland, Bleiksárgljúfur, 4.VII.1937, leg. M. P. Christiansen. Plate
VIII, fig. 92. Plate XXXXI, fig. 208.
Planta robusta, 25—40 cm alta. Folia laete lutescenti—viridia, glabra—parce
araneosa, petiolis alatis cum nervo mediano pallidis. Folia extima lingulata, integra,
dentata. Folia exteriora late lanceolata, lobis c. 3 utrinque, distantibus, longis,
angustis, patulis—hamatis, interlobiis latis, + longis, + denticulatis, lobo terminali