Hypericum gracillimum Koidz.

Perennial herb 0.15–0.6 m tall, erect to ascending from branching and rooting base, with stems caespitose or few, unbranched below inflorescence. Stems slightly 2(4)-lined to terete, eglandular or, very rarely, with a few black dots; internodes 10–40 mm, shorter to longer than leaves. Leaves sessile to subsessile or rarely to 0.5 mm petiolate, lower or almost all ascending; lamina 15–50 × 7–18 mm, lanceolate to oblong or rather broadly to narrowly elliptic or rarely oblanceolate, paler beneath, chartaceous; apex obtuse to rounded, margin plane, base rounded to broadly cuneate; venation: 3 pairs of main laterals from lower third to 2/5 of midrib, tertiary reticulation rather dense, obscure; laminar glands all black to mostly pale, punctiform, small, dense to rather sparse; intramarginal glands black and often pale, ± dense. Inflorescence 1–9(–14)-flowered, from 1–3 nodes, rarely with branches from up to 3 nodes below, the whole corymbiform to narrowly cylindric; pedicels 1.5–4 mm; bracts reduced-foliar; bracteoles narrowly oblong to linear. Flowers 12–16 mm in diam, stellate; buds ellipsoid, obtuse. Sepals 5, free, subequal to unequal, 3–4.5 × 0.8–1.3 mm, narrowly elliptic to narrowly oblong or linear, rounded to subacute, entire or very rarely with one prominent gland; veins 5, outer branching and anastomosing; laminar glands black, striiform (towards base) to punctiform or all ± punctiform or linear and then all or proximal pale; (intra)marginal glands black, few, distal or usually absent. Petals 5, yellow, not tinged red in bud, 7–9 × 2–4 mm, 2–3 × sepals, obovate, rounded, entire; laminar glands black, interrupted-linear to punctiform; marginal glands black, irregular and distal, or absent. Stamens c. 25–40, longest 6–8 mm, 0.85–0.9 × petals; anther gland black. Ovary 2–3.2 × 1.2–1.5 mm, ± narrowly ovoid to narrowly elliptic; styles 3, free, divergent, 2.5–5 mm, 1.2–1.8 × ovary; stigmas narrowly capitate. Capsule 5.5–9 × 2–4 mm, 1.7–1.8 × sepals, narrowly ovoid to subcylindric. Seeds yellow-brown, 0.6 mm; testa shallowly linear-foveolate.