ON THE HIERACIA OF NORTH YORKSHIRE. 321 
In Swaledale I am only aware of the occurrence of the follow- 
ing :—In Wensleydale H. murorum may be found on rocks in the 
vicinity of Aysgarth Force and other places. On the last it is 
plentiful about Rainton heights and Hawnby bank, where the 
examples issued in my fasciculus were gathered; and it may be 
found also more sparingly on the western margin of this set of 
hills. The range of elevation that I have noticed is from 100 
to 400 yards. In shady places the leaves are dilated in size, 
and conspicuously reversely incised below; this state is var. syl- 
vaticum of Fries, and doubtless also the H. nudicaule of Edmon- 
ston (vide ‘ Phytologist,’ iv. 843). 
6. H. cesium, Fries, Nov. ed. 1, p. 76?—Stem one to two 
feet high, rigid or flexuose, usually with one or two distinctly 
stalked leaves, slightly hairy below, corymbose above. Petioles 
shaggy. Root-leaves numerous, densely rosulate, green above, 
paler and czsio-glaucous below, subcoriaceous in sunny situations, 
frequently more or less tinged with purple; outer oblong-obtuse ; 
inner ovate-lanceolate, sparingly toothed below. Peduncles pa- 
tent, rigid, like the blunt-based involucres covered with white 
stellate down and black hairs and setze. Headsnumerous. Phyl- 
laries dark green, blackish when dry, paler at the margins; outer 
obtuse; inner more acute. Ligules glabrous. Styles more or 
less livid. 
Rocks and walls, in precisely similar situations to the pre- 
ceding. In several places throughout Teesdale, but not so com- 
mon there as H. pallidum. In Swaledale, near Richmond, and 
in Wensleydale, in the neighbourhood of Aysgarth Force, and 
other localities. Frequent amongst the Hambleton Hillis and 
other moorlands of the lower oolite. Ascertained range of ele- 
vation in the district 100 to upwards of 500 yards. M. Jordan 
assures me that this is “trés différent de lf. cesium, Fries ;” 
but what is described by Grenier and Godron (Flore de France, 
vol. i. p. 372), a plant with “ mostly scapiform and naked stems,” 
is evidently not what is intended in the ‘Symbole.’ It is however 
very probable that further research may show that the cesium 
which I have just described is not identical specifically with that 
from the Highlands, which Fries authenticated. In the position 
of its leaves and the vestiture of its peduncles (vide Dr. Walker 
Arnott’?s comments in the seventh edition of the ‘ British Flora,’ 
p. 223), the plant now under consideration approaches murorum 
N.S. VOL. I. 2T 
