The Botany of Iceland - 01.12.1942, Blaðsíða 38

264
M. P. CHRISTIANSEN
Habitat: Home-fields.
Localities: Lindabrekka, 16.VII.1935, fr., phot. N.
Geogr. Distr.: Only found in Iceland.
11. Taraxacum subreduncum M.P.Chr. n. sp.
Spec. orig.: Iceland, Flatey in Breiðifjörður, 10.VII.1935, leg. M. P. Christian-
sen. Plate I, fig. 11. Plate XXVI, fig. 163.
Planta 20—30 cm alta. Folia laete viridia, lutescentia, glabra—parce araneosa,
exteriora + purpureo-maculata, lanceolata et regulariter loba, petiolis sat latis, pal-
lidis, nervo mediano pallido vel paulo colorato, lobis sat approximatis, latis, deltoideis,
acutis, reflexis vel basin versus latis et in apicem breviusculum, obtusiusculum vel
breviter acutum, patentem vel sat retroversum abeuntibus, integris, lobo terminali
sat parvo—mediocri, sagittato—hastato, obtusiusculo, integro, lobulis basalibus
brevibus.
Involucrum basi sat turbinatum.
Squamae exteriores erecto-patentes vel laxe arcuatae, 2—4 X 9—11 mm, ovato-
lanceolatae, subtus laete olivaceo-virides, claro- vel purpureo-marginatae, supra albo-
virides, parce pruinosae.
Calathium c. 55 mm latum, planum, leviter radians, obscure luteum, ligulae
marginales sat latae, subtus stria laete cano-rosea notatae.
Antherae polline carentes (vel + polliniferae).
Stigmata virescentia.
Achenium laete stramineum, 3.9—4.2 mm longum, c. 1.3 mm latum, superne
dense sed breviter spinulosum, ceterum ubique tuberculatum, in pyramidem abrupte
cylindricam, 0.4—0.6 mm longam abiens. Rostrum 8—9 mm longum.
T. subreduncum has yellowish-green, regular-lobed, narrowly lanceolate leaves,
deltoid lobes with + suddenly constricted, short, patent ends. It seems to be closely
related to T. sagittifrons and T. declive. The former, however, has shorter, more
finely spinose fruit with a conic pyramid, and the latter differs by its dark-green
outer bracts. T. lonchophyllum also seems to be related, but this species has very
long, narrow and dark-green leaves.
Habitat: Home-fields, ditches.
Localities: Flatey in Breiðifjörður, 10.VII.1935, fr., phot., Bílðudalur, 11.VII.
1935. N.W.
Geogr. Distr.: Only found in Iceland.
12. Taraxacum loratum M.P.Chr. n. sp.
Spec. orig.: Iceland, Breiðabólsstaður, 9.VII.1937, leg. M. P. Christiansen. Plate
I, fig. 12. Plate XX, fig. 145.
Planta 35—50 cm alta. Folia obscure viridia, purpureo-maculata, sat araneosa,
longissima, lorata, nunc integra et dentata, dentibus longis, acutis, distantibus, nunc
lobulata—3—4-loba, lobis brevibus, patentibus, acuminatis, interdum lobis ad nervum
dorsalem latissimis et in apicem patentem—sat reflexum, acutum praerupte, abeun-
tibus, superioribus integris, inferioribus leviter dentatis, lobo terminali sat longo,
hastato, obtuso—breviter acuto, saepe integro, petiolis latis—alatis, pallidis—paulo
roseis, nervo mediano + roseo-purpureo vel pallido.
Squamae exteriores erecto-adpressae—laxe recurvatae, 3—2 X 11 mm, subtus
olivaceo-virides, supra laete virides, sat laete purpureo-marginatae, denique ubique
purpureae.
Calathium 30—40 mm latum, sat obscure luteum, planum, sat—valde radians.