The Botany of Iceland - 01.12.1942, Page 80

306
M. P. CHRISTIANSEN
regulariter subulato-dentatis, lobo terminali brevi, triangulari—hastato, obtuso—
mucronato, lobulis basalibus latis, brevibus, obtusis—breviter acutis vel mucronatis,
patentibus. Folia interiora + integra—breviter lobulata, valde et robuste dentata.
Involucrum laete viride. Squamae exteriores c. 3 mm latae, ovatae—lineari-lan-
ceolatae, longe attenuatae, adpressae—laxe patentes, subtus laete virides, + claro-
vel purpureo-marginatae. Squamae interiores inferne obscure, superne laete virides,
apice carneo.
Calathium laete luteum, radians. Ligulae marginales subtus stria purpurea
notatae.
Antherae polline carentes.
Stigmata virescentia.
Achenium laete stramineum (162), 4.0—4.3 mm longum, c. 1.2 mm latum,
superne breviter et late erecto- vel incurvo-spinulosum, ceterum laeve, in pyramidem
conicam, c. 0.7 mm longam, basi interdum spinulosam sensim abiens.—Rostrum
c. 7 mm longum.
T. brevihastatum belongs to the purple-spotted species with very bright leaves,
and is easily identified by its short and broad hastate terminal lobe, often about
as broad as the leaf in its broadest place.
It is no doubt introduced.
Habitat: Home-fields.
Localities: Akureyri, 29.VII.1937, plentiful, fr., phot. N.
Geogr. Distr.: Only found in Iceland.
74. Taraxacum subpardinum M.P.Chr. n. sp.
Spec. orig. : Iceland, Múlakot, 5.VII.1937, leg. M. P. Christiansen. Plate VII,
fig. 74. Plate XXXVII, fig. 196.
Planta mediocris—magna, 25—35 cm alta. Folia cano-viridia, lutescentia, dense
araneosa, + dilute purpureo-maculata, lingulato-lanceolata, sat profunde lobata,
petiolis sat latis, pallidis— + purpureis, nervo mediano pallido— + purpureo, lobis
sat brevibus, deltoideis, patentibus—leviter reflexis, acutis, antice leviter sigmoideis-—
concavis, integris—pauce dentatis, lobo terminali saepe magno, ovato—ovato-hastato,
obtuso—mucronato, supra medium interdum contracto, integro—late et breviter
dentato, lobulis basalibus patentibus—incurvis.
Involucrum basi truncatum. Squamae exteriores numerosae, laxe patentes—
recurvatae, 3.5—2.0 X 11—14 mm, lanceolatae—lineares, subtus obscure olivaceo-
virides, pruinosae, supra virides—glaucescentes, paulo purpureae, haud vel angustis-
sime albo-marginatae et corniculatae, et interiores apice obscuro- et luteo-mar-
ginatae.
Calathium c. 50 mm latum, densum, saturate—obscure luteum. Ligulae mar-
ginales planae, 2.5—2.8 mm latae, subtus stria cano-rosea—purpurea notatae.
Antherae valde polliniferae.
Stigmata obscura—virescentia.
Achenium griseo-brunneum (138—134), c. 3.3 mm longum, c. 1.2 mm latum,
superne latius et perdense longe, erecto- vel patenti-spinulosum, ceterum spinuloso-
tuberculatum, in pyramidem cylindricam, 0.9—1.1 mm longam abiens. Rostrum
10—11 mm longum.
T. subpardinum has bright purple-spotted leaves with a few lobes and a large,
ovoid-hastate terminal lobe, dark heads and numerous, slightly recurved, hardly
coloured outer bracts. It seems to be closely related to T. brevilobum.—The
numerous specimens from moist banks of rivulets near Múlakot had thinner and
more grey leaves and more teeth on the terminal lobe than the specimens from the
other localities.