The Botany of Iceland - 01.12.1942, Side 35
THE TARAXACUM-FLORA OF ICELAND
261
7. Taraxacum longisagittatum M.P.Chr. n. sp.
Spec. orig.: Iceland, Stóriendi in Þórsmörk, 8.VII.1937, leg. M. P. Christiansen.
Plate I, fig. 7. Plate XX, fig. 144.
Planta 20—30 cm alta. Folia laete cano-viridia, parce araneosa—fere glabra,
dilute purpureo-maculata, petiolis sat latis, pallidis, nervo mediano pallido vel parce
colorato, longa, anguste lingulata—lingulato-lanceolata, plerumque 3-loba, lobis basin
versus perlatis et saepe gradatim in interlobia transeuntibus in apicem sat retro-
versum, acutum abeuntibus, integris—parce dentatis, dorso concavo-sigmoideo, inter-
lobiis longis et latis, denticulatis, lobo terminali nunc mediocriter longo, sagittato,
breviter acuto, marginibus leviter convexis, integris, nunc longe hastato, integro,
supra lobulos basales + contracto et in apicem breviter acutum protracto.
Scapi + brunnescentes, parce araneosi.
Involucrum dilute olivaceo-viride.
Squamae exteriores, adpressae, subtus dilute virides, claro- vel roseo-marginatae,
supra laete virides, anguste lineares-—lineari-lanceolatae, 0.5—3.5 X 9—10 mm.
Calathium c. 40 mm latum, fere densum, convexum, obscure luteum. Ligulae
marginales latae, planae, subtus stria cana—cano-purpurea notatae.
Antherae polline carentes (vel interdum polliniferae).
Stigmata virescentia.
Achenium laete stramineum (c. 162), c. 3.6 mm longum, c. 1.2 mm latum,
superne breviter spinulosum, ceterum T" laeve, sensim in pyramidem 0.3—0.4 mm
longam, late conicam abiens, rostrum 8—10 mm longum.
T. longisagittatum is distinguished by its long, narrow leaves, sometimes with
purple spots. The anthers are most frequently without pollen, but in a few heads
among the cultivated plants there was plenty of pollen.
The Botany of Iceland. Vol. III. Part III.
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