The Botany of Iceland - 01.12.1942, Side 73

THE TARAXACUM-FLORA OF ICELAND
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65. Taraxacum crispifrons M.P.Chr. n. sp.
Spec. orig.: Iceland, Siglufjörður, 14.VII.1935, leg. M. P. Christiansen. Plate VI,
fig. 65. Plate XXVIII, fig. 168.
Planta 12—25 alta, robusta. Folia obscure cano-viridia, valde araneosa, -j- crispa,
+ late lingulata, petiolis angustis et cum max. parte nervi mediani lucide
purpureis. Fol. exteriorum lobis approximatis, latis, basin versus convexis, in apicem
brevem, patentem, acutum abeuntibus. Fol. intermedia c. 3-loba, lobis approximatis,
latissimis, deltoideis, reflexis, acuminatis, antice sigmoideis—rectis, supremis
singulariter dentatis, ceterum + subulato-dentatis, lobo terminali + longo, sagittato,
in apicem brevem, latum + contracto, + grosse dentato.
Involucrum basi + turbinatum. Squamae exteriores breves et latae, ovatae—
ovato-lanceolatae, sensim attenuatae, subtus dilute virides, + rubro-marginatae,
ecorniculatae, adpressae, interiores apice obscure purpureae.
Calathium 40—45 mm latum, planum—sat convexum, fere densum, dilute
luteum. Ligulae marginales fere planae, c. 3 X 17 mm, subtus stria laete cano-
purpurea—lucide purpurea notatae.
Antherae polline carentes.
Stylus et stigmata lutescentia—virescentia.
Achenium laete stramineum (c. 162), c. 4.7 mm longum, c. 1.7 mm latum,
superne breviter et crebre spinuloso-tuberculatum, ceterum + laeve, in pyramidem
late conicam, basi + spinulosam, c. 0.6 mm longam sensim abiens. Rostrum 10—11
mm longum.
T. crispifrons has rather broad, dense-lobed, crispate leaves, light-yellow, female
heads and fusiform, warty-toothed fruits with conic pyramid. In the forms of leaves
it reminds very much of T. Johnstonii Dahlst., but the fruit of this has long
spines above.
Habitat: Home-fields, ditches.
Localities: Múlakot, 5.VII.1937. S.—Hafnarfjörður !, l.VII.1937, Reykir at
Alafoss !, 29.VI.1937. S.W.—Siglufjörður, 14.VII.1935, fr., 30.VII.1937, plentiful,
phot., and 20.VII.1937 (Eydal). N.
Geogr. Distr.: Only found in Iceland.
66. Taraxacum cordatifrons M.P .Chr. n. sp.
Spec. orig.: Iceland, Þingvellir, 7.VII.1935, leg. M. P. Christiansen. Plate VI,
fig. 66. Plate XXVII, fig. 167.
Planta 15—30 cm alta. Folia cano-viridia, sat dense araneosa, lingulato—lan-
ceolata, sat parum sed regulariter lobata, petiolis sat angustis cum nervo mediano
+ obscure purpureis, lobis 2—4 utrinque, approximatis, latissimis, brevibus, +
reflexis, acutis, antice rectis—saepe valde convexis, integris—parce dentatis, lobo
terminali nunc parvo et cordato, mucronato, margine valde convexo, nunc longo—
longissimo, ovato-sagittato, acuto, margine convexo, integro—singulariter dentato.
Involucrum basi sat turbinatum. Squamae exteriores adpressae—erecto-patentes,
lanceolatae—lineari-lanceolatae, subtus laete olivaceo-virides, rubro-marginatae—fere
ubique purpureae, supra + purpureae.
Calathium 40—50 mm latum, luteum, ligulae marginales subtus Stria rosea
notatae.
Antherae polline carentes.
Stigmata virescentia.
Achenium stramineum (162), c. 4.1—4.5 mm longum, 1.3-—1.4 mm latum,
superne latissimum, crebre, longe et acute spinulosum, ceterum laeve—parce tubercu-
latum, in pyramidem 0.5—0.8 mm longam, latam, conicam abiens.