The Botany of Iceland - 01.12.1942, Síða 29

THE TARAXACUM-FLORA OF ICELAND
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Stigmata virescentia, subtus obscura.
Achenium fusco-stramineum, 3.6—3.9 mm longum, 1.3—1.4 mm latum, superne
longe et robuste suberecto-spinulosum, ceterum + laeve, in pyramidem c. 0.8 mm
longam, sat latam, cylindricam—subcylindricam abiens. Rostrum 7—8 mm longum.
T. nematolobum has dark-green raggedly lobed leaves with almost thread-narrow,
toothed lobes; small, dense, light-yellow heads without pollen, and large coarsely
toothed fruit. As regards the leaves the species appears to be related to T. Landmarkii
Dahlst. from Norway, but differs from this species by its dense, bright head, the
female flowers, the bright outward-spreading outer bracts with the distinct humps
and the large fruits. T. Landmarkii Dahlst. forma from Hordaland, 28.VII.1923
(Lillefosse), whose leaves are of the same shape as those of T. nematolobum, is
perhaps identical.
The species seems to form a transition to the Fulva-group and might (?) be a
gigas-form of T. brachycranum Dahlst.
Habitat: The foot of grassy mountain-slopes, rock-ledges.
Localities: Múlakot, 5.VII.1937, fr., phot. S.
Geogr. Distr. : Only found in Iceland (and Norway?).
d. Crocea M.P.Chr. n. sect.
(Spectabilia Dahlst. p. p.).
Plantae + graciles, raro mediocres et robustae. Folia leptalea, saepe longa et
angusta, laete—obscura viridia, raro glauco-viridia, interdum praesertim fol. exteriorum
+ purpureo-maculata, glabra—parce araneosa; petioli vulgo pallidi, nervo mediano
pallido— + colorato. Squamae involucri exteriores adpressae—erecto-patentes vel
+ laxe patentes, saepe late claro-vel albo-marginatae, laeves. Calathium densum—
radians, vulgo obscure luteum—croceum ; ligulae marginales subtus stria cana—cano-
violacea notatae. Antherae polline carentes vel polliniferae. Achenia 3.8—5.0 (raro
5.5) mm longa (pyramide inclusa), vulgo dilute straminea—• + fusco-straminea,
raro dilute rubra—brunneo-ferruginea, pyramide saepe lata, conica, raro longa,
angusta, cylindrica. Rostrum 7—10 (raro 11—13) mm longum.
Key.
a. Maculata. Upper surface of leaves + blotched with purple.
b. Anthers without, exceptionally with pollen.
c. Petioles pale, rarely pinkish. Midnerve pale— + coloured.
d. Fruit smooth, at summit indistinctly warty. 5 r espinulosum M.P.Chr.
dd. Fruits + spinous and warty.
e. Fruits only spinous above.
f. Leaves crispate. Lobes densely placed, + reflexed.
6. T. appositum M.P.Chr.
ff. Leaves not crispate.
g. The terminal lobe of the leaves long and narrow. Lobes + remotely placed,
often rcflexed. 7. T. longisagittatum M.P.Chr.
gg. The terminal lobe short. Leaves bluish green, lanceolate, almost smooth,
strongly purple-spotted, regular-lobed. g r stict0phoreum M.P.Chr.
ee. Fruits, at least the border fruits, almost everywhere spinous—warty.
f. Leaves undulate-crispate, bright green, with somewhat blurred purple spots,
shallow-lobed. The terminal lobe ovate-sagittate—ovate-hastate.
9. T. curvidens M.P.Chr.