The Botany of Iceland - 01.12.1942, Page 55

THE TARAXACUM-FLORA OF ICELAND
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of which are similarly long and narrow. The inner leaves recall T. calanthum
Dahlst.
It is no doubt spontaneous.
Habitat: Rock-ledges, birch-copses.
Localities: Þingvellir, 7.VII.1935, fr., phot., and 30.VII.1937, plentiful, Laugar-
vatn, 11.VII.1937, fr., Þrastarlundur, 11.VII.1937. S.W.—Laugar at Breiðamýri,
26.VII.1937. N.
39. Taraxacum dolichocentrum M.P.Chr. n. sp.
Spee. orig.: Iceland, Múlakot, 5.VII.1937, leg. M. P. Christiansen. Plate III,
fig. 39. Plate XVI, fig. 132.
Planta 20—35 cm alta. Folia sat lucide et saturate viridia, parce araneosa, longa,
angusta, lingulata, profunde lobata, petiolis late alatis—sat latis, pallidis(—leviter
rubescentibus), nervo mediano pallido, lobis 2—3 utrinque, sat distantibus—distanti-
bus, a basi latissimis, deltoideis, patentibus—sat reflexis, breviter—longe acuminatis,
antice o—pauci-dentatis, lobo terminali longissimo, lingulato—sagittato vel hastato,
breviter acuto, integro vel pauce et breviter dentato, interlobiis sat angustis, longis,
o—pauci-dentatis.
Squamae exteriores adpressae—erecto-patentes, ovato-lanceolatae—lanceolatae,
3.5—2.5 X 8—9 mm, subtus atro-virides, angustissime albido- vel roseo-marginatae,
supra laete virides, + laete purpureae.
Calathium obscure luteum, c. 35 mm latum, radians. Ligulae leviter canaliculatae,
marginales c. 2.8 mm latae, apice planae, subtus stria cano-rosea—brunneo-pur-
purea notatae.
Antherae polline carentes.
Stigmata mellea—leviter virescentia, subtus sat obscura.
Achenium dilute brunneo-stramineum (162), 3.5—4 mm longum, c. 1 mm
latum, aequilatum—leviter fusiforme, superne dense, minute spinuloso-tuberculatum,
ceterum tuberculatum—laeve, in pyramidem 0.5—0.7 mm longam, conico-cylin-
dricam, basi saepe dense spinulosam abiens. Rostrum 7—9 mm longum.
T. dolichocentrum has long, narrow leaves with a long hastate-sagittate terminal
lobe and few remotely placed lobes, dark-yellow heads without pollen and long,
narrow, finely spinous fruits. It may be mistaken for T. longisagittatum, whose leaves
may be of the same shape, but differs from it by its slightly purple-spotted leaves
and shorter and broader fruits.
The species is no doubt spontaneous.
Habitat: Near crags and rivulets, in ditches, by waterfalls, in birch-copses.
Localities: Múlakot, 5.VII.1937, plentiful, fr., phot., Bleiksárgljúfur !, 8.VII.
1937, Húsadalur and Stóriendi in Þórsmörk, 8.VII.1937, plentiful. S.—Efstibær,
11.VII.1910 (Helgi Jónsson). S.W.—Bílðudalur, 11.VII.1935, Patreksfjörður, 11.
VII.1935: N.W.—Siglufjörður, 13.VII.1935, Vaglaskógur in Fnjóskadalur, 23.VII.
1937, Grímsey, 20.VII.1898 (Ólafur Davíðsson). N.—Hallormsstaður, 24.VII.
1935. E. -
Geogr. Distr.: Only found in Iceland.
40. Taraxacum hastiliforme M.P.Chr. n. sp.
Spec. orig.: Iceland, Nes in Fnjóskadalur, 23.VII.1937, leg. M. P. Christiansen.
Plate III, fig. 40. Plate XVIII, fig. 138.
Planta sat parva, sat gracilis, 15—25 cm alta. Folia laete viridia, fere glabra,
lanceolata—lingulato-lanceolata, integra et dentata—parum lobata, petiolis sat latis
—angustis, pallidis, nervo mediano pallido—leviter roseo, lobis 1—2 utrinque, sat