Chascanum marrubiifolium Fenzl ex Walp.

Much-branched perennial herb or subshrub 10–40(–90) cm. tall, woody at the base with ± stout corky stems; young stems slender, densely white pubescent.. Leaves opposite or nearly so, sometimes appearing fasciculate due to abbreviated axillary branchlets; blades ovate, broadly elliptic or ± round, 0.5–4.5 cm. long, 0.5–3 cm. wide, rounded or obtuse at the apex, rounded, cuneate or subtruncate at the base, conspicuously coarsely crenate-serrate, densely adpressed whitish-pubescent on both surfaces, rather greyish; nervation impressed above and raised and reticulate beneath; petioles 0.1–2.5 cm. long.. Spikes terminal, solitary, numerous, 3–3.5 cm. long, dense, many-flowered but more scattered towards base; flowers closely adpressed to the rhachis, peduncles 0.5–1.7 cm. long; bracts lanceolate, (3–)4–5 mm. long.. Calyx narrowly tubular, 5–10 mm. long, 5-plicate and ribbed, ± densely pubescent with short ± tangled white hairs, minutely 5-toothed.. Corolla white or yellowish; tube very slender, 1–1.3 cm. long, straight or slightly curved, glabrous; lobes narrowly elliptic-oblong, subequal, 2.1–2.2 mm. long, 0.8 mm. wide, obtuse.. Stamens included.. Ovary oblong, 1 mm. long; style filiform, ± 9 mm. long.. Nutlets black, linear-oblong, 3–4 mm. long, 0.8 mm. wide, ribbed on the back and rather obscurely reticulate at the apex, glabrous.

In semi-desert.