The Botany of Iceland - 01.12.1942, Qupperneq 56

282
M. P. CHRISTIANSEN
distantibus, ad basin latissimis, sat brevibus, deltoideis, + hamatis vel patentibus,
acutis, antice subulato-dentatis, lobo terminali magno, ovato-sagittato, acuto, saepe
grosse dentato, lobulis basalibus brevibus, leviter reflexis—hamatis.
Squamae exteriores adpressae—patentes, 3.0—2.5 X 8—10 mm, subtus olivaceo-
virides, pruinosae, albido-marginatae, + purpureae, apice rubescentes.
Calathium c. 35 mm latum. Ligulae marginales subtus stria late cano-purpurea
notatae, dentibus obscure purpurascentibus.
Antherae polline carentes.
Stigmata virescentia.
Achenium griseo-stramineum, c. 3.7 mm longum, c. 1.2 mm latum, superne
breviter, robuste spinulosum, ceterum + tuberculatum—laeve, in pyramidem late
conicam—cylindricam, 0.6—0.8 mm longam, basi 1—2-spinulosam sat sensim abiens.
Rostrum 7—-10 mm longum.
T. hastiliforme appears to be nearly allied to T. hastile, but the latter has
broader and shorter outer bracts and a longer, narrow cylindrical pyramid on the
fruit.
Habitat: Home-fields.
Localities: Nes in Fnjóskadalur, 23.VII.1937, fr., phot. N.
Geogr. Distr.: Only found in Iceland.
41. Taraxacum pergracile M.P.Chr. n. sp.
Spec. orig.: Iceland, Hafnarfjörður, 8.VII.1935, leg. M. P. Christiansen. Plate
III, fig. 41. Plate XXII, fig. 151.
Planta sat parva, pergracilis, 15—20 cm alta. Folia glauco-viridia, canescentia,
parce araneosa, anguste lanceolata, sat parum profunde—profunde lobata, petiolis
angustis, pallidis, nervo mediano pallido, lobis 3—4 utrinque, distantibus, linearibus,
sensim attenuatis, reflexis—saepe hamatis, interlobiis longis, sublatis, saepe 1—pauce,
longe subulato-dentatis, lobo terminali longo, anguste sagittato-hastato, in apicem
acutum sensim attenuato, supra lobulos basales uni-dentato, lobulis basalibus angustis,
acutis.
Squamae exteriores laxe patentes, c. 1.5 mm latae, 8—9 mm longae, lineares,
subtus dilute olivaceo-virides, apice paulo coloratae, supra dilute virides, interiores
obscure virides, apice piceo-purpureae, marginibus dilute purpureae.
Calathium c. 30 mm latum, sat obscure luteum, convexum, valde radians. Ligulae
marginales subtus stria dilute cano-rosea notatae.
Antherae polline carentes.
Stigmata mellea—sat obscura.
Achenium sat fusco-stramineum (162—154), 3.5—3.7 mm longum, c. 1 mm
latum, superne longe, acute, sat erecto-spinulosum, ceterum tuberculatum—laeve,
in pyramidem 0.6—0.8 mm longam, late—sat anguste cylindricam—conico-cylin-
dricam abiens. Rostrum 6—8 mm longum.
T. þergracile has bluish-green linear-lanceolate leaves with a long, narrow terminal
lobe, remotely placed, linear lobes and linear, spreading outer bracts. The species
is without doubt related to T. hastile, T. oxyþhoreum and nearly allied species which
have similar strongly toothed fruits with a long pyramid. T. þergracile is one of the
smallest Taraxaca in Iceland.
It is no doubt spontaneous.
Habitat: Ditches.
Localities: Hafnarfjörður, 8.VII.1935, plentiful, fr., phot. S.W.
Geogr. Distr.: Only found in Iceland.