632 



H. constricti forme. e. g. in the clothing of the involucre, and the den- 

 tation of the leaves; but except for its decidedly cæsium-Yike habit, 

 the latter form differs widely from the form in question, by its 

 usually eoarse stem with often 2 sessile leaves, its short, coarse 

 involucre, more elosely covered with stellate hairs, and furnished 

 with broader, more obtuse phyllaries. Neither in Scandinavia nor 

 in the British Isles have I hitherto observed forms related to H. ar- 

 disodon, nor have they been met with in Iceland. 



The most noteworthy feature of this form is the distinctly 

 toothed hairs in the lower parts of the plant, which gives it a certain 

 resemblance to Oreadea and Cerinthoidea. Similar hairiness has been 

 observed in several of the Silvatica from the west coast of Scan- 

 dinavia and from the British Isles. In certain cases it must be ex- 

 plained as an inheritance from common ancestors and indicating 

 relationship to the above-mentioned groups; in other cases it is 

 unquestionably an adaptation to certain climatological conditions. 

 Moreover, the occurrence of the small (often, however, rather indis- 

 tinct) microglands on the peduncles is peculiar, and may possibly 

 point to a relationship to Oreadea. 



B. VULGATA GENUINA (Almqu.) Dahlst. 



3. HIERACIUM CORDIFRONS Dahlst. n. sp. 

 (Tab. XI. Fig. 9.) 



Caulis 20 — 35 ctm. altus, crassiusculus, subflexuosus, 1 — 2-fo- 

 lius, basi usque ad folium caul. infimum sparsim, molliter et 

 longe pilosus, cæterum glaber, apice parce stellatus. — Folia basalia 

 sub anthesi 3 — 5, exteriora parva elliptica obtusa subintegra, inter- 

 media ovalia — ovata subintegra — parce denticulata basi sæpe 

 obliqua dentibus + reversis angustis sæpe prædita, intimum ovatum 

 basi ovata sæpe obliqua + cordata dentibus longioribus pancis + 

 reversis acutis prædita, cæterum parce dentatum acutum ; folium cauli- 

 num infimum sæpe magnum prope basin caulis affixum, interdum ad 

 rosulum basalem valde approximatum + ovatum, basi sæpe + corda- 

 tum , subintegrum — sparsim dentatum, ima basi dentibus paucis 

 longioribus acutis reversis præditum, sat longe petiolatum, folium 

 siimmiim (v. unieum) subtus + stellalum parvum + ovatum — cor- 

 datum, sessile — breviter petiolatum, + acutum -- cuspidatum, in- 

 terne sparsim subulato-dentatum — subintegrum, margine sæpius + 

 plicatum; omnia in petiolis et in nervo dorsali + stellato sat dense, 



