Phymaspermum argenteum Brusse

Multistemmed, densely leafy shrub, 0.3-1.5 m high. Stems few-branched; branches erect, sparsely to densely silvery tomentose; fascicles present in leaf axils. Leaves alternate, spreading, 8.0-18.0 x 0.8-2.0 mm, linear when undissected, mucronate, sometimes revolute, entire to pinnatifid, narrowed into petiole-like base, without secondary basal lobes, sparsely to densely silver villous on both surfaces, fleshy; basal swelling present, continuous with stem ribs; lobes 3-5, 3.0-15.0 x 1.0-1.5 mm, linear, mucronate. Capitula discoid, homogamous, terminal, few to many-headed (10 to +100), compound corymbs, pedunculate; peduncles 5.0-30.0 mm long, slightly to densely silvery-tomentose. Involucre 5.0-7.0 x 1.8-3.5 mm, narrowly campanulate to cylindrical, tapering at the base; involucral bracts 3-or 4-seriate, tightly arranged, margins and apices scarious, membranous apices of all bracts 0.5-1.0 mm long, glabrous to villous (rarely beyond margins), brown margins dark and distinct, median resin canals present; outer bracts deltoid to lanceolate, 1.7-1.9 mm long, acuminate; middle bracts deltoid to ovate, 2.4-3.1 mm long, acuminate; inner bracts broadly oblong to lanceolate, 2.8-3.8 mm long, acuminate to rounded. Receptacle convex; paleae in marginal series, oblong, linear, 3.8-4.5 mm long, rounded, rigid with scarious apices, scarious apices ±0.5 mm long. Disc florets 6-23, without resin canals; corolla 2.3-3.1 mm long, with only glandular trichomes, yellow; tube 1.2-1.7 mm long; limb narrowly to broadly campanulate, 1.0-1.4 mm long (excluding lobes); lobes spreading, 0.7-1.0 mm long, narrowly to broadly triangular. Anthers 2.8-3.4 mm long (including apical appendage); apical appendage oblong to lanceolate. Style 2.0-3.0 mm long (excluding branches); branches 0.2-0.3 mm long. Cypselas 2.0-2.8 x 0.7 mm, oblong, 10-ribbed, apical rim thickened, entire, brown, glandular trichomes present, sparse, scattered, not mucilaginous when soaked, discontinuous resin canals in ribs absent. It flowers from May to September.