Heliotropium lineare (A.Dc.) Gürke

Erect perennial herb up to 45(60) cm high, with a thin rootstock and usually branched from the base; stem and branches angular, ± densely strigose with 2-armed trichomes. Leaves 18-60(75) x 1-4(8) mm, linear, basal ones usually narrowly elliptic, rough on both surfaces, strigose with 2-armed trichomes on the midrib and also sometimes on the secondary nerves below, acute to obtuse at apex, gradually narrowed into a short petiole at base, with entire revolute margins. Cymes short, up to 9 cm long when completely expanded, lax, ebracteate, often 2-4 together on short terminal peduncles. Flowers sessile or subsessile. Calyx subglabrous outside, glabrous or subglabrous inside; lobes 1.0-1.8 mm long, narrowly ovate to narrowly triangular, subequal, acute to obtuse, erect. Corolla narrowly infundibuliform, white, cream or yellow, clothed with scale-like 2-armed trichomes outside, glabrous inside; tube (3)4-5 mm long; lobes 1.2-2.0 mm long, triangular-acuminate and with undulate margins, subequal. Stamens inserted about the middle of the corolla tube; anthers 1.0-1.3 mm long, narrowly oblong, apiculate, subsessile. Ovary ovoid, glabrous. Style 1.0-1.6 mm long, terete, glabrous; stigmatic ring c. 0.5 mm in diameter, well-marked; sterile appendix c. 1 mm long, conical, bi-or 4-fid, glabrous. Fruits c. 2.0 x 3.5 x 2.0 mm, transversely ellipsoid, deeply depressed laterally, granulate-verrucose; nutlets free, usually narrowly winged, with the inner faces ± flat; each nutlet includes 2 cavities, the distal one fertile, the proximal one empty and usually smaller than the other.