BEITISH HIEKACIA. 53 



of hairs. Involucres green, cylindrical in bud, ultimately conical ; 

 truncate or constricted at the base after flowering, with very few 

 hairs, but hoary with coarse stellate down. Phylla/ries rather 

 porrect in the bud, obtuse or sub-acuminate, few innermost 

 occasionally cuspidate. Florets bright yellow, perfectly glabrous. 

 Styles yellow or faint orange, sometimes clothed with a few minute 

 darker hairs. 



Though, in some respects strongly resembling El. cwsium, yet 

 H. nggregatum widely differs in appearance fcom that species in its 

 umbellate corymb of narrow sub-cylindrical heads on long slender 

 petioles, and in having more coriaceous leaves and yellowish (not 

 livid) styles. Even when the plant is so feeble as to produce only 

 3 heads, the peculiar arrangement of the peduncles is frequently 

 exhibited, though sometimes it occurs with fe'wer and more branched 

 heads. As it retains its distinctive features under cultivation I am 

 induced to name it as above. 



On Little Craigindal it occurs vdth very dark heads (less aggre- 

 gated, but stUl showing the tendency to form an umbellate corymb), 

 and is conspicuous for the whiteness of its densely floccose peduncles. 

 This form in some respects closely resembles the continental H. 

 lifidmn, to which it is referred by Grenier ; but from the descrip- 

 tion of that species in Fries' Symbolse, H. aggregatvim differs in 

 having dark green (not glaucous) leaves, a stem but Kttle branched 

 and usually corymbose at the top only, and in having obtuse (rarely 

 cuspidate) phyUaries. 



[JT. 0READE8, (Fries), -which has a leafy branched stem, 

 oblong obtuse, glaucous leaves denticulate in the middle, sessile 

 stem-leaves; floccose tumid or truncate involucres with scattered 

 white hairs, obtuse phyllaries, florets pilose at the tips, and 

 yellow styles, is regarded by Fries as British on the authority 

 of Dillenius. I am not, however, satisfied to retain it as a 



