192 ENGLISH BOTANY. 



sidcrs exactly Fries's plant ; but Fries distinctly says, " Involucre 

 sub-nuda, nigra-glandulosa pilosa," which does not apply to the 

 Knaresborough plant. 



The variety y, Mr. Baker considers an intermediate form between 

 H. mm-orum and H. caesium, agreeing with the former in habit and 

 in the size and shape of the heads : with the latter in the mature 

 leaves becoming glaucous and sub-coriaceous, and the stem-leaf 

 being much reduced and sessile. 



A plant from the foot of Glen Esk, collected by Mr. Croall, 

 which Mr. Backhouse refers to H. murorum, has the beads sub- 

 umbellate, the stem and leaves densely woolly, and the pericline 

 sub-globular after flowering. I should liave referred it rather to 

 H. caesium. 



Wall Hmckweed. 



French, Ejterviere des Murs. German, Jlaiter Habichtskravi. 



SPECIES XXIV.— HIE RACIUM CESIUM. Fries {T). 



Plate DCCCXLVII. 



Eeich. Ic. Fl. Germ, et Helv. Vol. XIX. Tab. MDXXIV. Fig. 3. 



Sack. Mod. Hier. p. 56. Bab. Man. Brit. Bot. ed. v. p. 205. Hook. & Am. Bnt. FL 



ed. viii. p. 227. Fries, Epic. p. 92 (?). 

 "II. murorum, var. o, Linn. Sp. Plant, p. 1128." Fries. 

 II. murorum, ,S'm. Eng. Bot. No. 2082. 



Stem scape-like, corymbosely branched at the apex, sub- 

 glabrous below, above and on the peduncles, rather densely 

 clothed with stellate down intermixed with a few simple black- 

 based hairs, and sometimes a very few gland-tipped hairs. Radical 

 leaves sub-coriaceous, oblong-oval or oval, or oblong-lanceolate, 

 more or less abruptly attenuated into short wooUy petioles, sub- 

 obtuse or acute, remotely denticulate or dentate, especially 

 towards the base where the teeth are often large, with soft hairs 

 on both sides or only beneath, without stellate down ; stem 

 leafless or with a single leaf, which is usually above the middle 

 of the stem, very small, sessile, and bract-like. Anthodes rather 

 lai'ge, 3 to V, in a lax corymb, with the peduncles elongate, 

 ascending, usually nearly straight. Pericline hemispherical at 

 the base, ovate-ovoid after flowering ; phyllaries numerous, acute, 

 the outer ones sub-obtuse, dark-olive, densely clothed (especially 

 towards the margins) with stellate down intermixed with more or 

 less numerous white or white-tipped hairs, but with veiy few or 

 no black gland-tipped hairs. Florets sub-glabrous, not ciliated. 

 Styles livid-yellow. Plant glaucous. 



