170 ENGLISn BOTANY. 
it. In the Braemar and Clova districts, Western Inverness-shire, 
and Glen Lochy, Perthshire. 
Scotland. Perennial. Autumn. 
A very variable plant, when monocephalous somewhat like H. 
melanocephalum, gracilentum, and globosum, except in the texture 
of the leaves; but more often it has the stem distinctly branched, 
when it bears little resemblance to them. Stem 3 to 18 inches 
high ; loaves sub-coricaceous, attenuated into short petioles, the 
margins usually remotely dentate or dentate-serrate throughout, 
frequently spotted with purple; stem-leaves generally very small. 
Anthodes, when solitary, much larger than when there are 2 or 3 
on one stem. Pericline not silky, varying in hairiness, frequently 
without any white-tipped hairs. Styles much darker than in any 
of the preceding species. Plant green or slightly glaucous. 
The nearest ally is H. chrysanthum, from which H. nigrescens 
(hirers in its firmer, regularly oval, more evenly dentate-serrate 
leaves, sub-obtuse outer phyllaries, and very dark styles. Some of 
the forms I am unable to distinguish, except by the colour of the 
styles. 
Black-headed Hawkweed. 
German, Schwiirzliches Ilabichtskraut. 
SPECIES XL— HI ER AC I UM SENESCENS. Back 
Plate DCCCXXXIII. 
Back. Mon. Hier. p. 32. Bab. Man. Brit. Bot. ed. v. p. 202. 
II. chrysanthum, var. y, Hook. & Am. Brit. Fl. ed. viii. p. 221. 
II. atratnm, Fries, Epic. p. 95. 
Stem simple or corymbosely branched at the apex, more or 
less clothed with stellate down, intermingled above with blaek 
gland-tipped hairs and a few simple black hairs, nearly glabrous 
below, or with a few white simple hairs. Radical leaves rather 
thin, elliptical or oval, suddenly, or the inner ones rather 
gradually, contracted into rather long woolly petioles, acute, or the 
outer ones obtuse, remotely and evenly dentate or denticulate, entire 
towards the base, sparingly hairy on both sides; stem-leaves linear- 
oblanceolate, small. Anthodes solitary, or 2 or more in a corymb. 
Pericline ovale at the base. Phyllaries rather narrow, all subacute, 
thickly clothed with short black hairs, intermixed with numerous 
black gland-tipped ones, and sometimes a few black-based hairs. 
Florets sub-glabrous externally, slightly pilose at the tips. Style 
yellow or slightly livid. Plant green. 
On grassy slopes and rocky margins of streamlets. On the 
