284 THE J0UR5fAL OF BOTANY 



In 1902 I collected at Clieddar an example of the hawkweed 

 gathered there three years later b}^ Augustin Ley and referred to 

 H. ruhiglnosum. This identification appeared to me doubtful, and 

 as the British Museum possesses two specimens only of the plant, I 

 have obtained further material for examination through the kindness 

 of Mr. J. W. White, and am confirmed in the opinion that the name 

 H. ruhiginosum cannot stand for this plant. Mr. Linton also doubts 

 the correctness of the identification. 



The Cheddar form differs from H. ruhiginosum (1) by its stem 

 being normally slender, reddish, slightly pilose below and fiocculose 

 above, instead of robust, purple-tinted, pilose throughout and with 

 black-based and glandular hairs above; (2) by its radical leaves 

 being oval, more or less rounded at both ends (the outer ones occa- 

 sionally refuse), apiculatc, subentire or distantly denticulate, coria- 

 ceous, subglabrous above and sparingly pilose and reddish beneath, 

 while those of H. 7nihiginosum are more ovate, acute, irregularly 

 toothed, and pilose on both surfaces ; (3) by its peduncle^ being 

 densely fiocculose, with a very few scattered simple and fine, glandular 

 hairs, instead of less fiocculose, with numerous dark, glandular and 

 simple black-based hairs ; and (4) by its smaller heads, with the 

 phyllaries narrow and linear, but obtuse, grey-green and abundantly 

 fioccose, instead of broad, linear-lanceolate, obtuse or subacuminate, 

 and dark olive-green, only slightly fioccose. 



These features bring the Cheddar plant towards H. liolopliyJlum^ 

 and indeed in habit and foliage it is identical with specimens of the 

 latter collected on the Grreat Orme. Moreover, some of the Cheddar 

 specimens examined are shade-forms, producing thinner leaves, hairy 

 on both surfaces, precisely like shade-forms of H. JwlopliyUum from 

 Wharfedale. In panicle, however, the Cheddar plant seems distinct, 

 having rather more numerous heads on longer peduncles, each of 

 which bears one or more narrow, linear, ciliate bracts. The involucres, 

 too, are less broad and truncate, Avith distinctly narrower though 

 obtuse phyllaries showing more abundant pilose and glandular hairs. 

 It is therefore proposed to associate this hawkweed of the Cheddar 

 cliffs with H. Iiolophyllum of the limestone districts of Derbyshire, 

 Yorks, and Carnarvon. 



H. HOLOPHTLLUM W. R. Linton, in Journ. Bot. xxviii. 376 

 (1890) ; Brit. Hier. 49 (1905) ; Babington Manual, ed. ix. 250 

 (1904). 



/T. AT^ausTiSQUAMUM var. nov. 

 Exsicc. E. S. Marshall, 3090. 



Typo H. liolophiiUi similis, sed folia exteriora nonnunquam apice 

 retusa et ramificatio magis paniculata, sub-10-cephala, pedunculis 

 paulo longioribus fioccosis pilis tenellls interdum glanduliferis raris- 

 simis et bracteis angustis linearibus ciliatis obtectis pr?edita. Peri- 

 clinium baud latum, vix truncatum ; squaniLeangustielineares obtuste, 

 exteriores laxae, omnes dense griseo-fioccosae, apice parce senescentes, 

 pilis numerosis longis fuscis basi nigricantibus et brevioribus glanduli- 

 feris vestitae. Styli lutei vel fuscescentes. 



H. SAGiTTATUM Lindeb, var. philais'theax Dahlst. — Ui^pcr Tees- 

 dale, Durham, 1903. 



