20 BRITISH HIEEACIA. 



spathulate, rounded at the extremity, minutely apiculate ; inner- 

 most sometimes linear-lanceolate and sub-acute ; entire, or rarely 

 slightly denticulate. £ud usually drooping. Involucre narrowed 

 towards the base; white with long, silky, black-based hairs. 

 Outer j)Ayllaries broad, usually obtuse, or rarely sub-acuminate, 

 frequently sub-foliaceous. Florets bright yellow, beautifully 

 clothed externally, and especially at the tips, with brittle white 

 hairs. Styles pure yellow. 



In its wild state, ff. holosericeum may be distinguished from 

 H. alpinum by its blunt entire leaves, more silky stem and involucre, 

 and by its linear attenuate appressed acute inner phyUaries. Under 

 cultivation it becomes more dwarf and shaggy, produces larger heads 

 and still broader external phyUaries, which often resemble a whorl 

 of small linear leaves encircHng the true involucre. It never 

 branches, and appears to be invariably single-headed. These 

 characters are permanent when the plant is raised from seed. 

 When dried, the white silky hairs frequently become fulvous, as is 

 probably the case with those of many other species. 



5. H. EXIMITJM. Green. Stem elongated, one or few headed, 

 hairy, floocose, setose. Root-leaves lanceolate, acute, coarsely 

 dentate, or nearly entire ; hairy on both sides ; narrowed 

 into winged petioles. Stem-leaves small, linear or linear- 

 lanceolate. Irwohicres truncate at the laae, shaggy with 

 black-based rather sUky hairs, Phylla/ries numerous, linear, 

 attemiate, acute ; outer ones small, lax. Florets hairy ez- 

 temaUy, pilose at the tips. 



oc Exmnni. stem elongated. Koot-leaves lanceolate. Styles livid. 



H. alpinum |S melmoe»phahm. Bab. Man. Ed. 3, p. 194 (not 

 of Fries). 



