The Botany of Iceland - 01.12.1942, Side 47

THE TARAXACUM-FLORA OF ICELAND
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spinulis sat longis, acutis, suberectis praeditum, ceterum ,+ laeve, in pyramidem
latam, c. 0.5 mm longam, conicam sensim abiens. Rostrum c. 7 mm longum.
T. subscolopendricum is a slender species (in my garden, however, rather large
and robust) with small, dense, bright, female heads and ovoid, white-margined, +
appressed outer bracts.
It is no doubt spontaneous.
Habitat: Mó, grassy spots in heaths.
Localities: Reykjavík, 6.VI.1884 (Warming and Holm), Reykjavik, 1935, fr.,
near Þingvellir, 30.VI.1937, phot. S.W.
Geogr. Distr.: Only found in Iceland.
26. Taraxacum sigmoideum M.P.Chr. n. sp.
Spec, orig.: Iceland, Siglufjörður, 14.VII.1935, leg. M. P. Christiansen. Plate II,
fig. 26. Plate XXV, fig. 159.
Planta 15—30 cm alta. Folia laete cano-viridia, leviter undulato-crispa, sat dense
araneosa, anguste lanceolata—lingulata, 3—5-loba, petiolis sat latis, pallidis, nervo
mediano pallido—paulo colorato, lobis fol. exteriorum approximatis, latis, brevibus,
+ reflexis, acutis, antice sigmoideis, fol. intermediorum regulariter deltoideis, pa-
tentibus, integris vel denticulatis, lobo terminali triangulari-cordato, in apicem +
contracto. Folia interiora integra et dentata—parum lobulata, lobo terminali mediocri
—sat longo, sagittato-hastato, acutiusculo, integro—late dentato.
Scapi folia superantes, + purpurei, subaraneosi.
Involucrum obscure olivaceo-viride, basi sat turbinatum. Squamae exteriores
adpressae—sat erecto-adpressae, 4—3 X 8—10 mm, ovatae, subtus obscure ohvaceo-
virides, haud vel inconspicue marginatae, valde pruinosae, supra glaucescentes,
ecorniculatae.
Calathium 30—40 mm latum, obscure luteum, planum, leviter radians. Ligulae
marginales planae, c. 3 mm latae, subtus stria dilute roseo- vel cano-purpurea
notatae.
Antherae polline carentes.
Stylus luteus. Stigmata Iutea—leviter virescentia.
Achenium dilute stramineum (c. 162), c. 3.5 mm longum, 0.9—1.2 mm latum,
superne minute spinulosum, ceterum laeve, in pyramidem late conicam, c. 0.5 mm
longam sensim abiens. Rostrum c. 8 mm longum.
T. sigmoideum is distinguished by the broad, appressed outer bracts, female
heads, light-green leaves with closely placed lobes.
Habitat: Home-field, ditches.
Localities: Siglufjörður, 30.VII.1919 (J. Gandrup) and 13.VII.1935, fr.,
phot. N.
Geogr. Distr.: Only found in Iceland.
27. Taraxacum sagittifrons M.P.Chr. n. sp.
Spec. orig.: Iceland, Laugarvatn, 11.VII.1937, leg. M. P. Christiansen. Plate II,
fig. 27. Plate XXIV, fig. 157.
Planta 15—30 cm alta. Folia anguste lanceolata, laete viridia, lutescentia, sat
dense araneosa, dense et regulariter 2—4-loba, petiolis latis, pallidis, nervo mediano
pallido—paulo brunnescenti, lobis basin versus latis, brevibus, deltoideis, breviter
acutis—acutis, reflexis—subpatentibus, integris vel inferioribus denticulatis, antice
rectis—sigmoideis, lobo terminali sat parvo, sagittato—ovato-sagittato, breviter acuto,
integro.