228 ON THE HIERACIA OF NORTH YORKSHIRE. 
endeavoured to show how little real difference there is between 
the views of recent authors upon this important point. I will 
now proceed to enumerate in systematic order the species which 
we possess in this district, and attempt to indicate their range of 
characters and situations within the comparatively limited field 
to which these notes have reference. 
Series 1. (Pilosella, Fries.)—Mode of propagation by stolons. 
Leaves mostly or wholly radical. Achenia small. Hairs of the 
pappus arranged in a single row. 
1. H. Pilosella, Lin. Spec. Pl. 1125.—Stolons short and stout, 
or slender and elongated, procumbent or ascendimg, occasionally 
bearing flowers; very variable also in the length of its scapes 
and the quantity and quality of the vestiture of its leaves, stems, 
and involucres. In ericetal and pascual situations. The leaves. 
are clothed on the under side with a close covering of dense white 
pubescence: in damper localities this is much thinner. Outer 
ligules usually banded with red on the outside, but sometimes 
uniform in colour. 
Grassy banks and heathy places; sometimes covering by itself 
a considerable space. Universally distributed throughout the 
district, from the coast-line to the Arctic region. 
Is not our British H. dubium most likely to be only an aber- 
rant form of the common Pilosella? It is quoted doubtfully by 
Fries, under H. stoloniflorum of Waldstem and Kitaibel, but 
that species has its head-quarters in the north and east of Eu- 
rope, and runs out southward and westward, reaching only a 
single station in Norway, and even there considered as doubt- 
fully indigenous. 
H. aurantiacum, Lin. Spec. Pl. 1126, is commonly cultivated 
in gardens, and easily becomes diffused abroad and naturalized. 
It has established itself, for instance, in considerable abundance 
in woods near Wilton Castle, in Cleveland, the seat of Sir John 
Lowther, where the specimens issued in my fasciculus were 
gathered by W. Mudd. 
Series 2. (Aurella and Pulmonarea, Fries.)—Mode of propa- 
gation by rosettes. Stem-leaves none or few; radical leaves 
forming a basal tuft, which is nearly always present at the time 
of flowermg. Achenia comparatively large. Rays of the pap- 
pus arranged in two obscure rows. 
A plant has been reported from two localities in North York- 
