Hypericum seniawinii Maxim.

Perennial herb (0.15-)0.3-0.6 m tall, erect from creeping, rooting and sometimes branching base, with stems usually single, sometimes branched above, with branches virgate to curved-ascending.  Stems terete, eglandular; internodes 20-55 mm, shorter than leaves or usually exceeding them.  Leaves sessile or with broad 'petiole' to 1 mm; lamina (15-)20-50 ´ 5-13 mm, oblong to oblong-lanceolate, paler and rarely minutely papillose (Guangdong) beneath, not glaucous, plane, chartaceous; apex obtuse to rounded, margin entire, base subcordate-amplexicaul to broadly or narrowly cuneate; venation: 3(4) pairs of main laterals from lower third of midrib, with tertiary reticulation not prominent, dense; laminar glands pale, dense, rather large; intramarginal glands all black or the occasional one pale, dense.  Inflorescence c. 5-50-flowered, from 1-3 nodes, densely subcorymbose to broadly pyramidal, with flowering branches from up to 9 nodes below (often with a 'gap' of sterile nodes), the whole then cylindric; pedicels 1-2 mm; bracts and bracteoles ovate to linear-lanceolate, entire or occasionally with basal glandular cilia or rudimentary auricles, persistent.  Flowers 9-15(-c. 20) mm in diam., infundibulariform to stellate or recurved; buds ellipsoid, acute to obtuse.  Sepals 5, 2.5-5 ´ 1-2 mm, subequal to equal, erect in bud and fruit, oblong-lanceolate, acute, entire or subentire; veins 5(3), unbranched or outer pairs partly united; laminar glands pale, linear to striiform; marginal glands all black or rarely a few pale, in regular or interrupted row, sessile or slightly prominent.  Petals 5, bright? yellow, not tinged red in bud, 7-10 ´ 2-3 mm, 2-3 ´ sepals, narrowly oblong to narrowly oblanceolate-elliptic, margin subentire, laminar glands pale, striiform to punctiform or absent; marginal glands black, distal, sessile or more proximal immersed.  Stamens 24-c. 50, '3'-fascicled, longest 5-12 mm, slightly shorter than petals; anther gland black.  Ovary 3-locular, c. 1.5-3 ´ 0.7-1.3 mm, narrowly ovoid; styles 3, (2.5-)4-10 mm, c. 1.6-3 ´ ovary, free, divaricate-incurved; stigmas narrowly capitate.  Capsule c. 5-6 ´ 4-5 mm, ovoid, exceeding sepals; valves with dense longitudinal vittae.  Seeds yellowish-brown, c. 0.5 mm long, scarcely carinate; testa finely foveolate.