The Botany of Iceland - 01.12.1942, Side 32
258
M. P. CHRISTIANSEN
ff. Terminal lobe of leaves short, sharply triangular. Lobes acuminate.
37. T. acidotum M.P.Chr.
cc. Ciconia. Pyramid of fruit + long, + cylindrical.
d. Petioles pale.
e. Anthers without pollen.
f. Leaves long and narrow, most frequently with a long terminal lobe and a
long and narrow petiole.
g. Plants medium—vigorous.
h. Fruit Iong and narrow, about 4.5 mm long, with few and small spines
above, otherwise smooth.
38. T. longihastatum M.P.Chr.
hh. Fruit 3.6—3.9 mm long.
i. Fruit narrowly fusiform with fíne spines above. Leaves with few remotely
placed lobes.
39. T. dolichocentrum M.P.Chr.
ii. Fruit broadest at summit- with a coarse spinous and broad, almost
cylindrical pyramid. Leaves + entire and dentate.
40. T. hastiliforme M.P.Chr.
gg. Plants very slender. Leaves bluish green, very narrow. Outer bracts narrow,
patent. Fruit with rough, acute spines above.
41. T. þergracile M.P.Chr.
ff. Leaves short. Petioles + broad and short.
g. Herbs almost medium-sized. Intermediate- and inner-leaves broadly lan-
ceolate, entire and with coarse teeth. Fruit with coarse spines.
42. T. selenodon M.P.Chr.
gg. Herbs very small. Leaves shallow-lobed. Lobes 2—3 with subulate, hamate
apices. Fruit finely spinous, pyramid conic-cylindrical. Head very dense,
small.
43. T. þleniflorum M.P.Chr.
ee. Anthers with pollen.
f. Leaves + crispate.
g. Petioles narrow. Leaves deeply lobed. Lobes narrow, upward—downward
curved. Pyramid of fruit narrow, without spines.
44. T. subcrisþum M.P.Chr.
gg. Petioles broad-winged. Lobes few, narrow, often hamate. Terminal lobe
distorted. Pyramid of fruit strongly spinous.
45. T. uloþhyllum M.P.Chr.
ff. Leaves not crispate.
g. Lobes triangular, patent, somewhat remote, obtuse—shortly acute. Pyramid
of fruit broad and long.
(See 97 T. concavum M.P.Chr.)
gg. Lobes deltoid, broader—narrower, subulate-acuminate.
h. Outer bracts broad, ovate—ovate-lanceolate, dark olive-green, + margined,
appressed—upright opened.
i. Leaves narrowly lanceolate with high, short, deltoid, patent, coarsely
dentate lobes. Fruit coarsely and sharply spinous, also on pyramid.
46. T. armatum M.P.Chr.
ii. Leaves lingulate-lanceolate. Lobes slightly dentate. Pyramid of fruit
long and narrow, without spines, or slightly spinous.
47. T. hastile M.P.Chr.
hh. Outer bracts narrow, loosely patent, bright olive-green, often bright- or
white-margined.