170 ENGLISH BOTANY. 



it. In tlie 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; leaves 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 



differs 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 



stvles 



Black-headed Sawkioeed. 



German, SchwiirdicJies Ilahkhtshraut. 



SPECIES XL— HIERACIUM SENESCENS. Bach 



Plate DCCCXXXIII. 



Back. ]\ron. Hier. p. 32. Bab. Man. Brit. Bot. ed. v. p. 202. 

 H. chrysanthum, var. y, Hook. & Am. Brit. FL ed. viii. p. 221. 

 H. atratum, Fries, Epic. p. 95. 



Stem simple or corymbosely branched at the apex, more or 

 less clothed with stellate down, intermingled above with black 

 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- 

 oblanccolate, small. Anthodes solitary, or 2 or more in a corymb. 

 Pericline ovate 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, 

 plorcts 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 



