The Botany of Iceland - 01.12.1942, Page 37

THE TARAXACUM-FLORA OF ICELAND
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maculata, dense araneosa, sat undulato-crispa, lingulato-lanceolata, breviter 3—4-
loba, petiolis praesertim foliorum exteriorum late alatis, pallidis, interiorum paulo
roseis, nervo mediano + rubescenti-brunnescenti, lobis approximatis, superioribus
deltoideis, interdum antice basin versus convexis, o—pauci-dentatis, inferioribus basin
versus latis, in apicem angustum, patentem—sat retroversum, acutissimum attenuatis,
valde et irregulariter, saepe recurvo-dentatis, lobo terminali brevi, triangulari—
cordato, acuto vel longius ovato-sagittato, integro vel supra lobulos basales parce,
robuste dentato.
Involucrum basi leviter turbinatum.
Squamae exteriores erectae (—recurvatae), 3.5—2.0 X 10—12 mm, lanceolatae
-—lineares, subtus olivaceo-virides, + rubro-marginatae, supra sat glaucescentes, +
purpurascentes et pruinosae.
Calathium c. 50 mm latum, laete—sat obscure luteum, planum, leviter radians.
Ligulae marginales 18 mm longae, c. 3.2 mm latae, planae, subtus stria cano- vel
obscure cano-purpurea notatae.
Antherae brunneo-striatae, polline carentes (vel leviter polliniferae).
Stylus et Stigmata lutea.
Achenium laete brunneo-stramineum (153 D—157), c. 3.9 mm longum, 1.4—1.5
mm latum, superne dense, breviter, sat late spinulosum, ceterum ubique tubercu-
latum, in pyramidem latam, conicam, c. 0.6 mm longam, interdum inferne spinulosam
abiens. Rostrum 12—43 mm longum.
T. curvidens seems to be related to T. longisagittatum, but differs from this spe-
cies by its broader, somewhat crispate, and very hairy leaves, densely placed lobes,
and fruit throughout spinous—warty. Seems also to be related to species with pale
petioles within the group Naevosa.
Habitat: Home-fields, ditches.
Localities: Blönduós, 14.VII.1937, plentiful, fr., phot.
Geogr. Distr.: Only found in Iceland.
10. Taraxacum clitolobum M.P.Chr. n. sp.
Spec. orig.: Iceland, Lindabrekka, 16.VII.1935, leg. M. P. Christiansen. Plate I,
fig. 10. Plate XIII, fig. 125.
Planta 20—35 cm alta. Folia cano- vel glauco-viridia, maculata, sat dense
araneosa, lanceolata—anguste lanceolata, 3—4-loba, petiolis sat latis, pallidis, nervo
mediano pallido-brunnescenti, lobis approximatis, basin versus latis, deltoideis, +
longe acuminatis, + valde retroversis, antice + subulato-dentatis, lobo terminali
longo, sagittato-hastato, supra medium in apicem angustum, acutum praerupte pro-
tracto, lobulis basalibus Iongis, acutis, retroversis—sat patentibus, supra lobulos
basales robuste dentato-Iobulato. Folia interiora lobis brevibus et latis, deltoideis,
patentibus, valde dentatis instructa, lobo terminali ovato basi sagittato.
Involucrum olivaceo-viride. Squamae exteriores longae, 3—2 mm latae, lanceolatae
—lineares, olivaceo-virides, haud—inconspicue marginatae, suberecto-recurvatae.
Calathium 40—50 mm latum. Ligulae marginales subtus stria cano-violacea
notatae.
Antherae polline carentes.
Stigmata luteo-virescentia.
Achenium stramineum (162), c. 4.2 mm longum, c. 1.2 mm latum, superne crebre
et breviter spinuloso-squamulosum, ceterum + tuberculatum—laeve, in pyramidem
latam, conico-cylindricam, c. 0.6 mm longam abiens. Rostrum c. 9 mm longum.
T. clitolobum seems to be related to T. stictophoreum and similar species. It is
distinguished by its often strongly reflexed, acute, purple-spotted lobes, and fruits
spinose—squamulose throughout.
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