The Botany of Iceland - 01.12.1942, Blaðsíða 40

266
M. P. CHRISTIANSEN
14. Taraxacum laticonicum M.P.Chr. n. sp.
Spec. orig.: Iceland, Flateyri in Önundarfjörður, l.VIII.1937, leg. M. P. Chri-
stiansen. Plate I, fig. 14. Plate XVIII, fig. 140.
Planta 20—30 cm alta. Folia obscure viridia, subglabra, exteriora purpureo-
maculata, interiora immaculata, petiolis sat latis, pallidis—paulo roseis, nervo mediano
praesertim inferne + rubescenti. Folia exteriora lingulata, integra, parce dentata,
dentibus brevibus, + hamatis. Folia intermedia subintegra—lobata, lobis c. 2 utrin-
que, saepe alternis, basin versus latissimis, deltoideis—hamatis, lobo terminali
longissimo, sagittato-hastato, interdum supra lobulos basales + breviter et late
dentato, in apicem parce contracto, obtuso—breviter acuto.
Scapi folia persuperantes.
Involucrum sat turbinatum.
Squamae exteriores breves, 3—2 X 6—8 mm, ovato-lanceolatae, laete olivaceo-
virides, + albo- vel purpureo-marginatae, adpressae—erecto-patentes.
Calathium 40—50 mm latum, valde radians, obscure luteum, ligulae marginales
planae, c. 3 mm latae, subtus stria cana—cano-purpurea notatae.
Antherae polliniferae.
Stigmata lutea—virescentia.
Achenium c. 4 mm longum, 1.4—1.6 mm latum, superne crebre et breviter
tuberculato-spinulosum, ceterum laeve—parce tuberculatum, in pyramidem perlatam,
0.4 mm longam, conicam sensim abiens.
T. laticonicum is identified by its broad, shortly spinous fruits with a very broad
and short pyramid, and the lingulate leaves, the terminal lobe of which is very
long, about 14 of the length of the leaf.
Habitat: Home-fields, mountain slopes.
Localities: Flateyri in Önundarfjörður, l.VIII.1937, plentiful, fr., phot. N.W.
Geogr. Distr.: Only found in Iceland.
15. Taraxacum pycnostictum M.P.Chr. n. sp.
Spec. orig.: Iceland, Vestmannaeyjar, 5.VII.1935, leg. M. P. Christiansen. Plate
2, fig. 15.
Planta mediocris. Folia laete glauco-viridia, parce araneosa, lanceolata—anguste
lanceolata, profunde lobata, petiolis alatis, pallidis, lobis lateralibus 3—4 utrinque,
sat approximatis, latis, in apicem sat longum, acuminatum, + reflexum—hamatum
abeuntibus, superioribus integris vel dente grosse instructis, inferioribus + denti-
culatis, iis fol. interiorum magis dentatis, lobo terminali aut brevi, triangulari, supra
medium interdum + contracto, acuto, saepe integro, aut praesertim in fol. inte-
rioribus longo, sagittato, acuto, supra lobulos basales saepe grosse subulato-dentato.
Scapi folia aequantes, pallidi— + rubescentes, + araneosi.
Involucrum olivaceo-viride. Squamae exteriores 2.0—3.5 mm latae, lanceolatae—•
lineari-lanceolatae, subadpressae—sat patentes, subtus sat obscure olivaceo-virides,
angustissime albo-marginatae, supra glaucescentes, + purpurascentes.
Calathium c. 45 mm latum, sat densum, laete (?) luteum. Ligulae marginales
c. 3 mm latae, subtus stria lata, roseo-purpurea notatae.
Antherae polliniferae.
Stylus luteus, stigmata lutea—virescentia.
Achenium stramineum (162), c. 3.5 mm longum, c. 1.2 mm latum, superne
spinulis latis, brevibus, acutis praeditum, ceterum tuberculatum—laeve, in pyramidem
latam, conicam, 0.4—0.6 mm longam sensim abiens. Rostrum 6—7 mm longum.
T. pycnostictum has bright bluish-green, lanceolate leaves, strongly purple-spotted,
deltoid, + reflexed and acute lobes and bright yellow heads with plenty of pollen.
It seems to be closely related to T. stictophoreum and similar species.