Subshrub or shrublet (sometimes annual ?) 0.09-1.5 m tall, with taproot, usually bushy, erect; branches from base and below inflorescence, strict or lower ones ascending, rarely decumbent and mat-forming (0.03-0.08 m, 'H. woodsonii'), not rooting. Stems reddish-brown, 4-lined, ancipitous and densely gland-dotted when young, eventually terete, cortex exfoliating in strips; internodes 3-12 mm long. Leaves sessile, spreading from base to closely imbricate, longer than inter- nodes, deciduous above base or persistent (i.e. deciduous with cortex); lamina (3-)5-18(-23) x 0.8-4(-5) mm, narrowly elliptic-oblong to linear or more rarely narrowly lanceolate or (the lower) narrowly oblong-spathulate, margin recurved to revolute and rarely scabrid beneath, paler beneath, not glaucous, coriaceous to subcoriaceous; apex acute or apiculate to obtuse, base angustate or narrowly cuneate to parallel-sided, the pair scarcely forming interfoliar ridge or free; basal veins 1(3), with 1(2) pairs of main ascending lateral midrib branches, tertiary reticulation absent; laminar glands dense, not prominent or slightly so beneath. Inflorescence 1-25-flowered, branching pseudo-dichotomous/sympodial or very rarely wholly or mixed dichasial/monochasial, sometimes with 1 pair of subsidiary branches from node immediately below, or lower laterals flowering; peduncle and pedicels 4-10 mm long, not incrassate upwards;- bracts foliar, gradually reduced. Flowers 6-10 mm in diam., stellate. Sepals 4-8 x 1-2.3 mm, unequal, oblanceolate or oblanceolate-spathulate to oblong or elliptic or linear, acute; veins 5, unbranched, all becoming prominent; glands all linear or punctiform in upper ¼. Petals bright yellow to orange-yellow (? or orange), (5)6-7(-8.5) x 2.5-4.5(-6) mm, l.2(-l.5?) x sepals, oblanceolate to oblong; apiculus acute; glands linear, distally interrupted. Stamens 20-40, longest 3.5-6 mm long, c. 0.75 x petals, fascicles not distinct. Ovary 1.5-1.8 x 0.6-1 mm, narrowly ovoid- ellipsoid; styles 3, 2-3 mm long, c. 1.3-1.5 x ovary, spreading; stigmas broadly capitate. Capsule 3.5-5.5 x 2-3 mm, ovoid-cylindric to cylindric-ellipsoid, trigonous, acute to subrostrate, shorter than or equalling sepals. Seeds c. 0.6 mm long, ecarinate; testa finely scalariform.