The Botany of Iceland - 01.12.1942, Síða 78
304
M. P. CHRISTIANSEN
f. Leaves lucid, dark yellowish-green, lanceolate. Lobes with narrow, abrupt
point. Terminal lobe on outer leaves very small, hastate.
76. T. galeipotens M.P.Chr.
ff. Leaves greyish-green—bluish-green with a yellowish cast.
g. Lobes obtuse—shortly acute, on inner leaves narrow, remotely placed and
+ upward turned. Leaves dark bluish-green.
h. Fruit with cylindrical pyramid.
77. T. brevilobum M.P.Chr.
hh. Fruit with conic pyramid.
78. T. naevosum Dahlst.
gg. Lobes mucronate—acuminate.
h. Fruit at summit with coarse teeth, appressed—slightly spreading. Lobes
remotely placed with patent, acute point, on inner leaves + narrow, +
upward-turned. Upper edge concave. Interlobe with concave edge.
79. T. asþerum M.P.Chr.
hh. Fruit at summit with + patent, acute spines. Lobes closely placed,
deltoid, slightly reflexed, mucronate. Angles of lobes acute. Upper edge
convex—- + S-formed and point of lobe then patent.
80. T. mucroniferum M.P.Chr.
ee. Leaves with 2—4 side-lobes.
f. Fruit with long, acute spines above. Terminal lobe of leaves ovoid, rounded.
Basal lobes short, obtuse—shortly acute.
(See 74. T. subpardinum M.P.Chr.).
ff. Fruit with fine spines above.
g. Terminal lobe of leaves long, lingulate—hastate, rounded at point. Head
bright yellow, + dense. The herb large and robust.
81. T. cyclocentrum M.P.Chr.
gg. Terminal lobe of leaves broad, triangular-hastate with very short basal
lobes. Head strongly radiating. Young leaves with blurred purple spots.
82. T. dilutisquameum M.P.Chr.
bb. Fruit red, very long and narrow, strongly spinose. Leaves long and narrow,
bluish-green, strongly blotched with purple and multifid.
83. T. rubellum M.P.Chr.
aa. Intacta. Leaves without purplish blotches on the upper surface.
b. Fruit red with fine spines. Leaves smooth, somewhat lucid, fresh-green, entire—■
often deeply lobed.
(See 104. T. acromaurum Dahlst.).
bb. Fruit grey, greyish-brown or brown.
c. Leaves brightly greyish-green. Outer bracts narrowly lanceolate, inner leaves
obovate-lanceolate, remotely lobed. Fruit small with fine spines.
84. T. nematosquameum M.P.Chr.
cc. Leaves fresh-green, dark-green or blackish-green.
d. Lobes of leaves remotely placed, deltoid. The terminal lobe + hastate with
abrupt, lingulate point. Fruit large and coarsely spinose.
85. T. þarile M.P.Chr.
dd. Lobes of leaves closely placed.
e. Leaves slightly crispate.
f. Leaves fresh-green—somewhat dark-green. Lobes on outer leaves curved,
obtuse with a single coarse tooth, on medium- and inner-leaves acuminate,
dentate. Outer bracts rather broad.
86. T. selenophoreum M.P.Chr.