192 ENGLISH BOTANY. 



siders exactly Eries's plant ; but Eries 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. murorum 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 heads sub- 

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

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

 H. csesium. 



Wall Hawkweed. 



French, Eperviere des Murs. German, Maiier Hdbichtshraut. 



SPECIES XXIV.— H lERACIUM CESIUM. Fries (?). 



Plate DCCCXLVII. 



Reich Ic. El. Germ, et Helv. Vol. XIX. Tab. MDXXIV. Fig. 2. 



Back. Mon. Hier. p. 50,. Bah. Man. Brit. Bot. ed. v. p. 20J. Hook & Am. Brit. Fl. 



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

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

 H. murorum, Sm. 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. Badical 

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

 more or less abruptly attenuated into short woolly 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 

 large, 3 to 7, 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 very few or 

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

 Styles livid-yellow. Plant glaucous. 



