1902, BuRBiDGE & CoLGAX. — A New Scnecio Hybrid. 315 



Senecio Cineraria DC. 



Perennial aud sub - fruticose : 

 Stems, corymb branches,involucres 

 aud under side of leaves covered 

 with densely felted, white tomen- 

 tum ; leaves petioled, coarsely pin- 

 natifid, the segments usually with 

 entire margins towards the base 

 aud bluntly lobed towards the ex- 

 tremity, the limb of the leaves 

 much inflexed so as to expose the 

 white under - surface ; flowering 

 stems with a few distant leaves 

 above, rising from amongst ample 

 trusses of barren leafy shoots ; in- 

 florescence almost naked, corymb 

 branches divaricate ; ray florets 

 broadly ligulate, averaging -^ in. in 

 breadth and ^ in. in length, the 

 tubular portion with an average 

 length of ^ in. ; fertile seeds 

 numerous, smooth. 



Senecio Jacobdea Linn. 

 Biennial and herbaceous : Stem 

 usually glabrous and purplish ; 

 leaves sessile, semi-amplexicaul, 

 with laciniate auricles, fresh green, 

 glabrous or sparingly pubescent, 

 the segments irregularly and 

 much lobed throughout ; corymb- 

 branches ascending, their upper 

 parts, the pedicels, and the base of 

 the involucres with greyish pubes- 

 cence ; inflorescence densely leafy; 

 ray-florets narrowly ligulate, aver- 

 aging jV in. in breadth and ^ in. in 

 length, the tubular portion with 

 an average length of nearly /^ in. ; 

 fertile seeds numerous, those of 

 the ray smooth, of the disc pilose. 



X Senecio albescens. 



Biennial, herbaceous : Stem, corymb-branches, involucre, and under 

 side of leaves covered with a thinly-spread grey tomentum^ the stems 

 occasionally purplish below ; leaves pinnatifid, amplexicaul and auricled, 

 the segments much lobed; corymb ample, with divaricate branches, 

 leafy, but less so than in SJacobcta ; ray-florets averaging 3*5 in. in breadth 

 and nearly if in. in length, the tubular portion with an average length of 

 ^2 iu- ; perfect seeds infrequent, those of the ray smooth, of the disc 

 obscurely pilose 



To come now to the second branch of the evidence, that is 

 to say, evidence drawn from the distribution of the hybrid 

 and of its parents. It was found that on the Sorrento Cliffy, 

 properly so called, only one Senecio occurred, the alien S.Ciiier- 

 aria DC. Here there was no Common Ragwort {S. Jacobcca) 

 and no hybrids of either form. But passing from the Cliffs 

 proper to the railway embankment, on which they abut at 

 their western extremit)', at the point where the line pierces 

 a spur of the Dalkey granite hills with a short tunnel, both 

 the Common Ragwort and the hybrids at once began to 

 appear, mingled with typical 5. Ci7ieraria. Passing along 

 southw^ard towards the Vico bathing-place, S. Cineraria and 



