| Much-branched shrub 1–2 ft. Leaves 1 × 112 in., narrow-linear; margins revolute to the midrib. Head 1 in. diam., solitary on a leafy peduncle | 25. S. bifistulosus. |
| Closely branched shrub 4–10 ft. Leaves ⅙–¼ in., linear-oblong. Head solitary, sessile, ⅓ in. diam. | 26. 'S. cassinioides. |
| *** Heads discoid; ray wanting. | |
| Branching shrub 4–10 ft. Leaves 2–6 in., obovate or oblong-lanceolate, tomentose beneath. Panicle large. Heads ⅓ in. diam. | 27. S. elæagnifolius. |
| Shrub or small tree 6–30 ft. Leaves 2–5 in., orbicular or nearly so. Panicles large. Heads ⅓ in. diam. | 28. S. rotundifolius. |
| Small compact shrub 1–3 ft. Leaves ½–2 in., oblong, very coriaceous. Corymbs usually dense. Heads ¼–⅓ in. diam. | 29. S. Bidwillii. |
| Slender glabrous shrub 1–4 ft.; young branchlets glutinous. Leaves 1½–3 in., obovate-spathulate, veined. Corymbs lax. Heads ⅓–½ in. diam. | 30. S. geminatus. |
S. Pottsii, Armstr. in Trans. N.Z. Inst. iv. (1872) 290, is quite unknown to me, and there are no specimens in any colonial herbaria. It is described as a small slender suffruticose species with decumbent flexuose branches 3–6 in. long, the branches, petioles, and leaves beneath clothed with loose white cottony tomentum. Leaves petiolate, ½–1 in. long, ovate or spathulate, glabrous above, crenate. Heads solitary, ⅓ in. long, on slender bracteate peduncles; involucral bracts 15–20, linear, obtuse, cottony.—Mount Jollie, Rangitata district, alt. 4500 ft.
S. dimorphocarpos, Col. in Trans. N.Z. Inst. xxvi. (1894) 316, is S. jacobæa, Linn., the common ragwort of the Northern Hemisphere, which has become naturalised in many districts in both the North and South Islands. It is a tall almost glabrous perennial 2–4 ft. high, with irregularly pinnatifid or 2-pinnatifid leaves 2–6 in. long, a dense corymb of rather large heads ⅔–1 in. diam., bright-yellow rays, and glabrous ribbed achenes.
S. areolatus, Col. l.c. 317, is S. sylvaticus, Linn., another common northern plant which has become established in New Zealand. An annual slightly glandular-pubescent herb 1–3 ft. high, with irregularly pinnatifid leaves 1–3 in. long, loose coryinbs of small heads ⅓ in. diam., with very short revolute rays and silky ribbed achenes.
Several other species of Senecio have become naturalised, the most widely distributed being S. vulgaris, Linn., the common groundsel, which can be recognised by its small size, 6–12 in. high, succulent grooved stems often branched from the base, irregularly pinnatifid or toothed leaves, small cylindric heads with the florets all tubular and hermaphrodite, and an involucre of about 20 equal bracts.
1. S. lagopus, Raoul in Ann. Sci. Nat. Ser. iii. 2 (1844) 119, t. 18.—Rootstock stout, densely clothed at the top with long brownish silky wool. Leaves all radical, crowded, spreading; blade 1–5 in. long, broadly oblong, rounded at the tip, usually cordate at the base, margins entire or crenulate, upper surface rugose, covered with short stiff bristles, beneath densely clothed with white tomentum; petioles ½–4in. long, stout or slender, densely villous. Peduncles or scapes 1–12 in. high, simple or much branched, pubescent and glandular-pilose; bracts few, small, obtuse. Heads 1 to many,
