1.	All round the margin of the leaf of S. lagopus, S. saxifragoides, and S. bellidioides occur at very regular intervals—i.e., at the ends of the veins—rounded glandular protuberances of a very dark red or purple colour. Microscopical examination shows these to be typical hydathodes.
2.	The petiole of the leaf of S. lagopus bears quantities of dark-red or purple bristles, generally spotted or pied with white; these are continued up the back of the midrib nearly to the apex of the leaf, and are also present along the margin all round the leaf.
3.	S. saxifragoides also shows this purple or pied bristle upon the petiole and the back of the midrib exactly as in S. lagopus, and also bears this bristle all round the margin of the leaf, making a continuous fringe. The young leaves of S. saxifragoides have yellow marginal bristles, which change gradually into purple and continue to deepen in colour up to maturity. The yellow bristle, however, is usually present together with the purple, the yellow being upon the upper surface of the leaf just within the margin, the purple being upon the” margin itself; but they are sometimes more or less mixed together.
4.	Forms of Senecio lagopus and Senecio saxifragoides which grow in situations shaded by other vegetation, as among long tussock-grass, or on

	the edge of forest, or beneath large plants of Linum monogynum, show a complete or almost complete absence of the purple colouring-matter in the glandular hairs, and also tend to be larger, to have a much longer petiole than usual, and to be less thickly covered with silky hairs or bristles (as the case may be) than the usual form.
5.	Though the plant of S. saxifragoides is probably on the average a little larger than that of S. lagopus, the difference is not great. Kirk's measurements do not agree with the others. A leaf of S. lagopus 8 in. long without the petiole would be most exceptional, but leaves 6 in. long with a petiole of from 3in. to 4in. are common—e.g., on Mount Herbert—and S. saxifragoides can hardly ever be much larger than this, though its leaves are generally broader and more substantial. I have a very strong impression, which I hope to verify by future observation, that the plants of S. lagopus in the neighbourhood of Akaroa Harbour are in general distinctly smaller than those of the Mount Sinclair to Mount Herbert area. This would explain the small measurements of Raoul's type. Some of the large individuals of the Mount Herbert area, indeed, almost seem to be intermediate states such as Hooker speaks of. The largest leaf of S. lagopus measured by me shows the following dimensions: Length of blade, 6 in.; length of petiole, 3 in.; breadth of blade, 4 in. This plant grew on the south-western peak of Mount Herbert, and was exceptionally large. Its measurements equal those of S. saxifragoides in any authority and exceed most of them. A most exceptionally large plant of S. saxifragoides, however, gave the following measurements: Length of blade, 7 ½ in.; length of petiole, 4 ⅛ in.; breadth of blade, 6 ¾in. This is much above the average of the species, the plant being shaded by plants of Linum monogynum and tussock-grass.
6.	Thus the leaf of typical S. lagopus is found to bear six different types of structure—(a) The thick brownish “wool” of the rootstock, which covers the base of the petiole and seems to pass gradually into (b) long white silky hairs, which clothe the petiole and are continued up into the sinus and on to the lower portion of the leaf; (c) the characteristic stout bristle which occurs, as described below, on the margin and upon the upper part of the blade especially; (d) the dark-red or purple bristle which is thickly intermixed with the white hairs upon the petiole, from the point where the brownish “wool” passes into white hairs up to the apex, or nearly, on the back of the midrib; (e) the glandular marginal purple protuberances; (f) the white tomentum upon the back of the leaf.
7.	Many plants of S. lagopus bear the silky hairs as well as the characteristic stout bristles. The silky hairs usually occur very thickly on the petiole and at the base of the leaf and in the immediate vicinity of the midrib; less thickly, if at all, on the rest of the leaf, as depicted in Raoul's plate.
8.	Many plants of S. saxifragoides bear the stout bristles which have been hitherto considered to be characteristic of S. lagopus and S. bellidioides. The bristles occur in S. saxifragoides under these conditions:— (a.) They occur near the apex of the leaf upon the upper surface of about one-fourth or one-third of the whole—not near the base, and but rarely on the lower half of the leaf at all (as in Raoul's plate of S. lagopus), though specimens have been observed with the bristles fairly evenly distributed over the whole surface. (See Plate XII.) (b) They occur regularly and as a permanent character all round the margin exactly as in S. lagopus and S. bellidioides.

2. Special Characters of the Two Species Under Consideration.