The Botany of Iceland - 01.12.1942, Side 34

260
M. P. CHRISTIANSEN
marginales c. 15 X 2.5 mm, subtus stria dilute cano-violacea vel cano-purpurea
notatae.
Antherae polline carentes.
Stylus luteus. Stigmata lutea—leviter virescentia.
Achenium stramineum— -j- fusco-stramineum (128 D—162), 3.3—3.6 mm lon-
gum, 0.9—1.0 mm latum, in pyramidem 0.15—0.35 mm longam, conicam abiens.
Rostrum 8—9 mm longum.
T. esþinulosum has a highly characteristic fruit, almost without any pyramid,
and frequently quite smooth, differing in this feature from almost all other species.
Further, it is recognisable by its rather bright, often spotted leaves with high, deltoid,
patent, entire—few-toothed, + sharp lobes and short, triangular—hastate terminal
lobes. Petioles rather broad and pale. Head rather dense, somewhat dark yellow.
Anthers without pollen. Stigmas yellow.
Probably spontaneous.
Habitat: Ditches.
Localities: Laugarna at Reykjavík, 9.VII. and 7.VIII.1935, fr., phot., and 22.VII.
1937, plentiful. Reykjavík, 9.VII.1935. S.W.
Geogr. Distr.: Only found in Iceland.
6. Taraxacum appositum M.P.Chr. n. sp.
Spec. orig.: Iceland, Patreksfjörður, 11.VII.1935, leg. M. P. Christiansen. Plate I,
fig. 6. Plate XIII, fig. 123.
Planta 15—25 cm alta. Folia sat obscure viridia, lutescentia, praesertim in nervo
mediano sat araneosa, + purpureo-maculata, sat crispa, petiolis latis, pallidis, nervo
mediano pallido—leviter brunnescenti, lingulata—lingulato-lanceolata, 3—5-loba,
lobis perapproximatis, basin versus perlatis, sat longis, deltoideis, valde reflexis,
acuminatis, antice rectis—leviter convexis, integris vel inferioribus + subulato-den-
tatis, lobo terminali longo, triangulari-sagittato, breviter acuto, integro vel singulariter
dentato, lobulis basalibus retroflexis, acutis.
Involucrum olivaceo-viride.
Squamae exteriores 3.7—2.0 X 9—11 mm, lanceolatae—lineares, erecto-patentes,
subtus sat laete olivaceo-virides, + pruinosae, anguste sed conspicue albo- vel claro-
marginatae, supra laete virides—albo-virides, interiores apicibus obscure viridibus,
fere concoloribus.
Calathium c. 45 mm latum, planum—leviter convexulum, sat obscure—obscure
luteum, + densum. Ligulae marginales c. 18 X 3 mm, planae, subtus stria parce
cano-rosea notatae vel fere concolores.
Antherae polline carentes vel parce polliniferae.
Stigmata virescentia—atrovirescentia.
Achenium dilute brunneo-stramineum (162), c. 4.2 mm longum, 1.2—1.3 mm
latum, superne breviter spinulosum, ceterum + tuberculatum—laeve, in pyramidem
late conicam, c. 0.4 mm longam, + spinulosam abiens. Rostrum c. 9 mm longum.
T. aþþositum belongs to the group with purplish spotted leaves and, as to its
habit and the shape of the fruit, bears a very close resemblance to T. loratum and
similar species. However, it is easily distinguishable by its broad, pale petioles, the
very densely lobed and somewhat crispate leaves, the lobes of which are strongly
reflexed and almost overlap each other, and by the faintly coloured stripes on the
marginal corollas.
Habitat: Home-fields.
Localities: Patreksfjörður, 11.VII.1935, fr., phot. N.W.
Geogr. Distr.: Only found in Iceland.