The Botany of Iceland - 01.12.1942, Side 99

THE TARAXACUM-FLORA OF ICELAND
325
Involucrum c. 11 X 18 mm, ovatum, basi truncatum. Squamae exteriores 4.5—-2.0
X 13—15 mm, acuminatae, suberectae—patuli-arcuatae, subtus laete olivaceo-
virides, + pruinosae, supra laete virides, apice purpureo, ecorniculatae.
Calathium 50—60 mm latum, dilute luteum, convexulum, leviter radians, ligulae
marginales c. 2.8 X 18 mm, planae, arcuatae, subtus stria dilute cano-rubescentia
notatae, apice purpureo.
Antherae polliniferae.
Stigmata lutea, subtus sat obscura.
Achenium sat obscure stramineum—olivaceo-stramineum (162—153), c. 3.5 mm
longum, c. 1 mm latum, subaequilatum, superne pauce sed late suberecto-spinulosum,
ceterum + tuberculatum—laeve, pyramide c. 1 mm longa, cylindrica. Rostrum
9—10 mm longum.
T. leucoceþhalum has lanceolate leaves, with remotely placed, + narrow, patent
or + hamate lobes on the outer leaves, long bright, loosely patent—slightly recurved
outer bracts and narrow fruits; the inner fruits often have only one large, obtuse
tooth on each side. The species seems to be closely related to T. latisþinulosum and
T. islandiciforme Dahlst.; the former has entire and coarsely dentate leaves and
broad fruits, the latter is more slender without the long terminal lobe.
Habitat: Home-fields.
Localities: Egilsstaðir, 19.VII.1935, plentiful, Brekka, 21.VII.1935, fr., phot.,
Hallormsstaður, 23.VII.1935, in quantity. E.
Geogr. Distr.: Only found in Iceland.
99. Taraxacum ciconium M.P.Chr. n. sp.
Spec. orig.: Iceland, Egilsstaðir, 19.VII.1935, leg. M. P. Christiansen. Plate IX,
fig. 99. Plate XXXVIII, fig. 198.
Planta 25—35 cm alta. Folia laete cano-viridia—prasino-glaucescentia, glabra—
parce araneosa, petiolis angustis cum nervo mediano pallidis—-(leviter roseis),
exteriora lanceolata, 5—6-loba, lobis subdistantibus, superioribus deltoideis, reflexo-
patulis, saepe integris, inferioribus deltoideo-linearibus, patulis, apicibus + porrectis,
acutis—acuminatis, lobo terminali parvo—mediocri, hastato—sagittato, fol. inter-
media obovato-lanceolata, 2—3-loba, lobis + distantibus, triangularibus—deltoideo-
hamatis, acutis, subulato-dentatis, lobo terminali magno, ovato basi sagittato,
mucronato, + lobulato et inciso, interiora obovato-lanceolata, subintegra, + dentata
—breviter lobulata.
Involucrum ovatum, basi truncatum. Squamae exteriores 2—4 X 10—13 mm,
ovatae—ovato-lanceolatae, patentes—- + arcuatae, supra laete virides apicem versus
+ rubro-violascentes, subtus obscure olivaceo-virides, brunnescentes et interiores
sub apice conspicue corniculatae.
Calathium 40—50 mm latum, sat obscure luteum, valde radians. Ligulae interiores
canaliculatae, marginales + planae, subtus stria cano-purpurea notatae, dentibus
atro-purpureis.
Stigmata virescentia.
Antherae polliniferae.
Achenium fuscum—fusco-olivaceum (154), 3.5—4.0 mm longum, c. 1.2 mm
latum, superne longe spinulosum, ceterum + tuberculatum—laeve, in pyramidem
c. 1.3 mm longam, cylindricam, inferne 1—2-spinulosam abiens. Rostrum 8—9 mm
longum.
T. ciconium has bright leaves of a peculiar onion-green—bluish-green colour,
lanceolate, narrowly and remotely lobed outer leaves, broad few-lobed intermediate
leaves with a large and broad ovoid, + coarsely dentate terminal lobe and a fruit
The Botany of Iceland. Vol. III. Part III.
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