Hypericum thasium Griseb.

Perennial herb 0.15–0.4(–0.55) m tall, erect from decumbent rooting base, with stems numerous, spreading from taproot, branching from most nodes. Stems 2–4-lined, with amber to reddish sessile glands toward base and few black glands on lines; internodes 10–30(–50) mm, shorter to longer than leaves. Leaves sessile, ascending; lamina 10–35 × 1–4 mm, all linear or lower sometimes lanceolate to narrowly oblong or elliptic-oblong, slightly paler beneath, chartaceous; apex obtuse, margin revolute, base parallel to subamplexicaul; venation: 2–3 pairs of main branches from lower 1/3–2/5 of midrib; laminar glands pale, punctiform, dense; intramarginal glands black, regular, usually hidden. Inflorescence 3–45-flowered, from 1–5 nodes, sometimes with flowering branches from one node below, the whole broadly rounded-pyramidal to cylindric; bracts and bracteoles linear-lanceolate to linear, with margin glandular- or eglandular-fimbriate and with ± developed auricles. Flowers 25–32 mm in diam., buds ovoid, obtuse. Sepals equal, markedly imbricate, basally slightly connate, 7–11 × 2.5–3.5 mm (excluding fimbriae), elliptic to oblong or ovate, rounded, long-glandular- or eglandular-fimbriate; veins 3–5, unbranched; laminar glands pale, punctiform, numerous, and black, few, subapical; marginal glands black, regular. Petals bright yellow, not tinged red, 13–16 × 6–8 mm, obovate-oblong to elliptic-oblong, rounded; laminar glands numerous, pale, linear-striiform (proximal) to mostly punctiform; marginal glands black, punctiform, regular, sessile or in crenations. Stamens c. 45–80, 5-fascicled, longest 8–10 mm, c. 0.5 × petals; anther gland black. Ovary 3.5–5 × 2–3 mm, ellipsoid; styles 5(6), 5(–6.5?) mm, 1.3 × ovary, diverging. Capsule c. 8 × 5 mm, broadly ovoid, with rather sparse, interrupted vittae. Seeds not seen.