53 BUITISH HIERACIA. 



20. H. AGGEEGATUM. Be&p green. Stem with one leaf, urn- 

 lellato-corymlose at the extremity, floccose, without hairs. 

 Soot-leaves broadly ovate, obtnse, coarsely dentate at the 

 base, stalked, glabrous on both sides or slightly hairy 

 beneath and at the margins. Stem-leaf sab-sessile. Peckm- 

 eles erect, closely aggregated, densely floccose. Involucres 

 narrow, rather ttirbmate at the base, ultimately conical, floccose, 

 nearly destitute of hairs. Phyllaries oltuse. Florets glab- 

 rous. 



Margins of Alpine streamlets at an elevation of 1500 to 2500 feet : 

 rare. Usually on granite. Glen Dee, and eastern slope of Caimtoul. 

 CUffs above Dhuloch, and on Little Craigindal, Aberdeenshire. 



Flowers in 7th and 8th months. 



Plant 15 to 20 inches high, with numerous small heads. 

 Boot slender, woody at the neck, with few fibres. Stem erect, 

 rigid, frequently purplish below, glabrous throughout or floccose j 

 simple and with 1 (usually small) leaf near the base, or branched 

 rather below the middle and having at the axil a (sometimes 

 strong) leaf J densely corymbose at the extremity, with numerous 

 (3 to 17) heads on elongated slender erect peduncles, springing 

 nearly from the same point ; when branched, each branch ter- 

 minating (if sufficiently robust) in a similar sub-umbellate corymb. 

 Leaves coriaceous, dark and rather dull green above, paler and 

 slightly glaucous beneath. Eoot-leaves densely rosnlate, apicu- 

 late ; nearly entire, or with distant glandular teeth in the upper 

 part J usually with very irregular blunt teeth below the middle 

 and sharply dentate at the (sometimes sUghtly decurrent) base ; 

 glabrous, or with few scattered deciduous hairs and stellate down 

 beneath, minutely villous at the margins when young. Petioles 

 reddish, nearly glabrous. Stem-leaf lanceolate, acute, sharply 

 toothed (when large), narrowed downwards to a nearly or quite 

 sessile base. Pedfimeles slender, elongated, simple or bifid, white 

 with dense stellate down, more or less thickened upwards, destitute 



