The Botany of Iceland - 01.12.1942, Side 109
THE TARAXACUM-FLORA OF ICELAND
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lobes and medium-sized, somewhat hastate terminal lobes with a broad, lingulate
and mucronate point. The inner leaves are lingulate-lanceolate, entire or remotely
and coarsely dentate, between the teeth denticulate. These leaves are of the same
shape as the inner ones of T. hyþochoeris, but this species has pale petioles. T.
chloodeum seems to be closely related to T. melanocephalum, but the latter has
fusiform, remotely spinous fruit with a finely furrowed, conic pyramid.
Habitat: Rock-ledges, birch-copses.
Localities: Húsadalur in Þórsmörk, 8.VII.1937, fr., phot. S.
Geogr. Distr.: Only found in Iceland.
109. Taraxacum luxurians M.P.Chr. n. sp.
Spec. orig.: Iceland, Múlakot, 8.VII.1937, leg. M. P. Christiansen. Plate X,
fig. 109. Plate XXXXIII, fig. 215.
Planta robusta, 25—40 cm alta. Folia laete lutescenti-viridia, canescentia, +
araneosa, lanceolata—lingulata, integra et valde dentata—sat parum lobata, petiolis
latis et brevibus, + purpureis, nervo mediano leviter purpureo. Fol. exteriorum lobis
sat approximatis, 3—4 utrinque, brevibus, latis, patulis, deltoideis vel basin versus
convexis et in apicem brevem, acutiusculum, sat incurvum, sat abrupte attenuatis,
superioribus integris, inferioribus subulato-dentatis, lobo terminali brevi, triangulari
—hastato et in apicem anguste lingulatum, + dilatatum, acutum protracto. Folia
interiora lingulata, aut integra et grosse, irregulariter dentata, dentibus patentibus—
leviter reflexis vel hamatis vel parum profunde lobata, lobis deltoideis, + reflexis,
lobo terminali mediocri—longo, ovato-cordato, saepe aequilato, mucronato, singu-
lariter dentato vel + grosse dentato—laciniato.
Involucrum basi truncatum. Squamae exteriores latae, 4—6 X 10—13 mm,
arcuatae, subtus obscure olivaceo-virides, leviter purpurascentes, supra laete virides,
interiores atro-virides.
Calathium 55—65 mm latum, laete luteum, leviter convexum, + radians. Ligulae
marginales c. 2.8 X 22 mm, subtus stria cano-violacea notatae, dentibus atro-
purpureis.
Antherae polliniferae.
Stigmata lutescentia—virescentia.
Achenium fusco-stramineum—brunnescens, c. 3.6 mm longum, c. 1.1 mm latum,
superne dense, robuste, acute spinulosum, ceterum tuberculatum—saepe laeve, in
pyramidem 0.5—0.7 mm longam, conico-cylindricam, saepe spinulosam abiens.
Rostrum 11—12 mm longum.
The inner leaves of T. luxurians are lingulate-lanceolate, entire and coarsely
dentate, the teeth + reflexed—hamate, or shallow-lobed with a large terminal lobe.
The terminal lobe is broad, ovate-hastate, mucronate, in the lower half furnished
with coarse teeth or small lobes. The species seems to be closely related to T.
chloodeum and T. melanoceþhalum.
Habitat: Birch-copses, rock-ledges, home-fields.
Localities: Stóriendi in Þórsmörk, 8.VII.1937 (?), Múlakot, 8.VII.1937, fr.,
phot. S.
Geogr. Distr.: Only found in Iceland.
110. Taraxacum subhoplites M.P.Chr. n. sp.
Spec. orig.: Iceland, Reykjahlíð at Mývatn, in birch-copse, 25.VII.1937, leg.
M. P. Christiansen. Plate X, fig. 110. Plate XXXXIV, fig. 217.
Planta mediocris. Folia saturate viridia, canescentia, sat dense araneosa, leviter
crispa, lanceolata, sat profunde lobata, petiolis latis—alatis, pallidis—leviter coloratis