The Botany of Iceland - 01.12.1942, Page 94
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M. P. CHRISTIANSEN
Maculata.
89. Taraxacum selenolobum M.P.Chr. n. sp.
Spec. orig.: Iceland, Hafnarfjörður, l.VII.1935, leg. M. P. Christiansen. Plate
VIII, fig. 89. Plate XXXXI, fig. 209.
Planta mediocris—sat magna, 20—30 cm alta. Folia cano-viridia—glauco-viridia,
+ purpureo-maculata, sat dense araneosa, lanceolata, sat profunde 5—8-loba, petiolis
pallidis, nervo mediano pallido, lobis approximatis, subangustis, sat longis, deltoideo-
hamatis vel hamatis, acutis, superioribus singulariter dentatis, inferioribus irregulariter
dentatis, fol. exteriorum lobis interdum in apicem + abruptum abeuntibus, lobo
terminali saepe brevi, triangulari-cordato vel hastato, obtuso, lobulis basalibus acutis,
parce hamatis vel patentibus, lobo terminali plantarum robustarum magno, ovato-
sagittato, obtuso, late et robuste dentato.
Squamae exteriores laxe patentes, 5—3 X 14—15 mm fere aequilatae, obtusae,
subtus obscure olivaceo-virides, + pruinosae, apice sat piceo, supra glaucescentes,
ecorniculatae.
Calathium c. 60 mm latum, planum, sat valde radians, laete luteum. Ligulae
planae, marginales c. 3.3 X 21 mm, subtus stria cano-purpurea notatae, dentibus
purpurascentibus.
Antherae polline carentes vel interdum parce polliniferae.
Stylus virescens. Stigmata virescentia, subtus atro-virescentia.
Achenium fusco-stramineum (153—154), c. 3.8 mm longum, 1.3—1.5 mm latum,
superne latius, crebre, longe, robuste, erecto- vel patenti-spinulosum, ceterum +
squamulosum—tuberculatum, basi interdum laevi, in pyramidem 0.5—0.7 mm
longam, conico-cylindricam sat sensim abiens. Rostrum c. 9 mm longum.
T. selenolobum has lanceolate, greyish-green—bluish-green, purple-spotted leaves;
+ narrow, hamate, densely placed lobes, large bright heads, patent—recurved, long
outer bracts and strongly spinous fruits. It seems to be closely related to T. atro-
plumbeum Dahlst., but differs from this species by the + narrow, hamate lobes and
the short pyramid of the fruit. The species forms a connecting link between the
Naevosa- and the Macrodonta-group.
Habitat: Home-fields.
Localities: Þrastarlunður, 11.VII.1937, phot., Hafnarfjörður, 8.VII.1935, fr.,
and l.VII.1937. S.W.—Stykkishólmur, 10.VII.1935. W.
Geogr. Distr. : Only found in Iceland.
90. Taraxacum latifrons M.P.Chr. n. sp.
Spec. orig.: Iceland, Akureyri, l.VIII.1937, leg. M. P. Christiansen. Plate VIII,
fig. 90. Plate XXXX, fig. 204.
Planta robusta, 20—35 cm alta. Folia obscure cano-viridia, purpureo-maculata,
+ dense araneosa, obovato-lanceolata—late lanceolata, profunde lobata, petiolis
alatis—latis, pallidis—roseis, nervo mediano inferne + roseo, superne pallido—brun-
nescenti, lobis approximatis, sat angustis, longis, sat hamatis—basi porrecto et apice
hamato, superioribus breviter acutis, integris, inferioribus subulato-acuminatis, +
dentatis, margine inferiore saepe dente grosso instructo, lobo terminali parvo, late
galeato.
Involucrum brunneo-viride. Squamae exteriores late ovatae, erecto-patentes—laxe
patentes, subtus olivaceo-virides, supra laete virides, + pnrpureae.
Calathium 40—50 mm latum, densum, sat convexum, obscure luteum. Ligulae
in apicem leviter canaliculatae, marginales subtus stria cano- vel obscuro-purpurea
notatae, dentibus rubro-purpurascentibus.
Antherae valde polliniferae.