Hypericum macvaughii N. Robson

Hyperico formoso Kunth affinis, sed caule 2 lineabus infrafoliaribus irregularibus glandularum nigrarum punctiformium interdum ornato, foliis ellipticis vel oblongo-ellipticis vel oblanceolatis, glandulis laminaribus praecipue nigris vel praecipue pellucidis, floribus minoribus, alabastris haud rubrotinctis, sepalis integris vel subintegris, petalis haud apiculatis, staminibus paucioribus, stylis brevioribus, inter alia differt.

Perennial herb (0.12–)0.3–0.65 m tall, erect, not creeping or rooting at base, usually branching above or at most nodes with branches ascending. Stems very shallowly 2(4)-lined above, soon or wholly terete, occasionally turning vinous red, eglandular or with 2 irregular infrafoliar lines of black punctiform glands; internodes 10–45 mm, exceeding to shorter than leaves. Leaves sessile to subsessile; lamina 12–35 × 2.5–17 mm, elliptic or oblong-elliptic or oblanceolate to linear, paler beneath, chartaceous; apex rounded, margin plane to recurved, base cordate-amplexicaul or usually rounded to narrowly cuneate; venation: 2–3 main laterals from base or near base to lower half of midrib, tertiary reticulation dense, often rather obscure, visible beneath; laminar glands mostly pale with few black distally to mostly black, large, dense; intramarginal glands black, dense. Inflorescence c. 18–numerous-flowered, from 3–4 nodes, ± dense with partial inflorescences also dense, with spreading to ascending branches from up to 13 nodes below, the whole broadly pyramidal to cylindric or corymbiform; pedicels 1–2 mm; upper leaves reduced, bracts and bracteoles 1.5–5 mm, linear to linear-subulate, entire or with some prominent glands. Flowers 12–16 mm in diam., stellate; buds ellipsoid, acute, not red-tinged. Sepals 5, equal, free, 3.5–5 × 0.7–1 mm, lanceolate to linear-lanceolate, acute, entire or with ± prominent glands; veins 5, unbranched; laminar glands black, linear to punctiform, dense to rather few; marginal glands black, few, immersed to sessile or ± prominent. Petals 5, yellow, 6–7.5 × 2–3 mm, 1.5–1.7 × sepals, ± narrowly oblanceolate, rounded; laminar glands black, striiform to punctiform, dense to sparse; marginal glands black, sessile to slightly prominent. Stamens 16–24, ‘3’-fascicled, longest 6–6.5 mm, 0.9–1 × petals; anther gland black Ovary 2 × 1–1.5 mm., ovoid; styles 3, 3–4 mm, 1.5–2 × ovary; stigmas narrowly capitate. Capsule 6–7 × 3–4 mm, narrowly ovoid, longitudinally vittate. Seeds not seen.