Page:Manual of the New Zealand Flora.djvu/404

364 {|
 * colspan=2|* Involucral bracts 8–10.
 * Glabrous or nearly so. Leaves membranous, usually regularly denticulate||1. E. prenanthoides.
 * colspan=2|** Involucral bracts 10–14.
 * Cottony or woolly. Leaves linear-oblong, lobed or pinnatifid||2. E. arguta.
 * Scabrid with short white hairs. Leaves linear-oblong, lobed or pinnatifid||3. E. scaberula.
 * White with cottony tomentum. Leaves linear-elongate, entire or minutely remotely toothed; margins revolute||4. E. quadridentata.
 * Glabrous or nearly so. Leaves erect, lower oblong or linear-oblong, upper linear, entire or denticulate||5. E. diversifolia.
 * Glabrous or nearly so. Leaves spreading, membranous, pinnatifid or pinnate with a large terminal segment||6. E. glabrescens.
 * }
 * White with cottony tomentum. Leaves linear-elongate, entire or minutely remotely toothed; margins revolute||4. E. quadridentata.
 * Glabrous or nearly so. Leaves erect, lower oblong or linear-oblong, upper linear, entire or denticulate||5. E. diversifolia.
 * Glabrous or nearly so. Leaves spreading, membranous, pinnatifid or pinnate with a large terminal segment||6. E. glabrescens.
 * }
 * Glabrous or nearly so. Leaves spreading, membranous, pinnatifid or pinnate with a large terminal segment||6. E. glabrescens.
 * }
 * }

1. E. prenanthoides, D.C. Prodr. vi. 296.—A tall erect annual or biennial herb 1–4 ft. high, simple or branched above, glabrous or slightly hairy. Leaves rather distant, 2–6 in. long or more, linear-oblong to lanceolate or linear-lanceolate, acuminate, lower petiolate, upper sessile with broad toothed auricles, membranous, regularly or irregularly closely and finely denticulate, rarely lobed. Corymbs very large, terminal, 6–12 in. across or more; pedicels slender, ¼–⅓ in. long. Heads quite glabrous, ¼ in. long; involucral bracts 8–10, narrow-linear, green with white margins. Florets 18–22; females more numerous than the hermaphrodite. Achenes linear-oblong, grooved, hairy, surmounted by a callous ring surrounding the base of the pappus.—Hook, f. Fl. Nov. Zel. i. 141; ''Handb. N.Z. Fl. 156; Benth. Fl. Austral.'' iii. 658; Kirk, Students' Fl. 333. Senecio prenanthoides, ''A. Rich. Sert. Astral.'' 96. S. heterophyllus, ''Col. in Trans. N.Z. Inst.'' xxvii. (1895) 389.

2. E. arguta, D.C. Prodr. vi. 296.—A coarse erect annual herb 1–3 ft. high; stem stout, grooved, branched above, more or less cottony or woolly, rarely almost glabrous. Leaves 2–4 in. long, linear-oblong or lanceolate, acute or obtuse, lower usually contracted into a petiole, upper sessile with a broad toothed stem-clasping base, coriaceous, coarsely and irregularly toothed or lobed or pinnatifid, lobes sinuate-dentate, upper surface glabrous or cobwebby, beneath more or less clothed with loose white cottony tomentum. Corymbs terminal, dense; pedicels slender, cottony. Heads ¼ in. long; involucral bracts 12–14, usually with a few minute ones at the base, narrow linear-lanceolate, woolly below. Florets 30–40; females much the most numerous. Achenes