The Botany of Iceland - 01.12.1942, Page 43

THE TARAXACUM-FLORA OF ICELAND
269
Herbs closely related to this species were found in some places, but I have not
been able to grow these herbs and a sure identification has not therefore been
possible.
Habitat: By water-fall, on rocks.
Localities: Múlakot, 5.VII.1937, fr., phot. S.
Geogr. Distr.: T. crasþedotum is found in Sweden.
20. Taraxacum gladiatum M.P.Chr. n. sp.
Spec. orig.: Iceland, Laugar at Breiðamýri, 27.VII.1937, leg. M. P. Christiansen.
Plate II ,fig. 20. Plate XVII, fig. 135.
Planta 10—15 cm alta. Folia sat obscure viridia, parce araneosa, oblanceolata—
sat anguste lanceolata, 2—4-loba, interlobiis latis, + denticulatis, lobis approximatis,
deltoideis, basin versus latis, patentibus, acutis—acuminatis, parce dentatis, lobo
terminali longo, sagittato—hastato, acuto, integro vel uni-dentato, lobulis basalibus
acuminatis, petiolis pallidis, nervo mediano pallido.
Scapi folia aequantes, pallidi.
Squamae exteriores adpressae—erecto-patentes, late ovatae—-lanceolatae, subtus
laete olivaceo-virides, albo-marginatae, interiores apice -T purpureo.
Calathium c. 3.5 mm latum, laete luteum, densum. Ligulae marginales breves,
subtus stria laete cana notatae.
Antherae polline carentes.
Stigmata laete virescentia.
Achenium stramineum (162), c. 4 mm longum, c. 1 mm latum, superne tenuiter
spinulosum, ceterum laeve, in pyramidem latam, 0.5 mm longam, conicam abiens.
Rostrum 7—8 mm longum.
T. gladiatum is very slender, has small, densely flowered, light-yellow heads with
female flowers and the terminal lobe of the leaves long, acute. It seems to be
closely related to T. divaricatum. This species, however, is rather sturdy and has
dark-yellow heads.
T. gladiatum is no doubt spontaneous.
Habitat: Grassy mountain slopes.
Localities: Laugar at Breiðamýri, 27.VII.1937, fr., phot. N.
Geogr. Distr.: Only found in Iceland.
21. Taraxacum declive M.P.Chr. n. sp.
Spec. orig.: Iceland, ísafjörður, 12.VII.1935, leg. M. P. Christiansen. Plate II,
fig. 21. Plate XV, fig 129.
Planta 20—30 cm alta. Folia griseo-viridia—obscure viridia, subaraneosa, anguste
lanceolata—lanceolata, 3—5-loba, petiolis late alatis, pallidis, nervo mediano brun-
nescenti, lobis perapproximatis, anguste deltoideis, sensim acuminatis, reflexis, raro
reflexo-patentibus, integris—parce dentatis, interlobiis latis, brevibus, lobo terminali
longe sagittato, breviter acuto, margine parce convexo, supra lobulos basales + den-
tato; folia interiora lobulata et valde dentata.
Scapi + brunnescentes, parce araneosi.
Involucrum obscure viride.
Squamae exteriores adpressae—erecto-patentes, 2—3 mm latae, ovato-lanceolatae
—lanceolatae, obscure virides, + albido-marginatae, interiores obscure virides.
Achenium laete stramineum (c. 162), 3.8—4.0 mm longum, 1.2—1.4 mm latum,
leviter fusiforme, superne crebre, erecto-patentem spinulosum vel squamulosum, in
pyramidem late conicam, 0.5—0.6 mm longam, basi saepe spinulosam sensim abiens.
Rostrum 7—8 mm longum.