Hypericum nuporoense (Nomenclature)
Perennial herb c. 0.25–0.35 m tall, erect from woody rootstock, with stems several, sometimes rooting at the base, unbranched below inflorescence. Stems shallowly 2-lined at first, soon terete, eglandular; internodes 15–20 mm, shorter than leaves. Leaves sessile; lamina 25–40 × 10–20 mm, all triangular-lanceolate, slightly paler beneath, chartaceous; apex rounded to subobtuse, margin plane, base cordate-amplexicaul; venation: 3 pairs of main laterals from lower quarter to 2/5 of midrib; tertiary reticulation dense, scarcely visible above; laminar glands black, punctiform, rather dense to very sparse; intramarginal glands black, dense. Inflorescence 7–30-flowered, from 3 nodes, sometimes with branches from one node below, the whole broadly pyramidal with branching angle relatively broad (c. 30–35°), dense; pedicels 2–3.5 mm; bracts reduced-foliar, bracteoles distinct, narrowly elliptic to narrowly lanceolate. Flowers c. 15 mm in diam., stellate?; buds not seen. Sepals 5, subequal, 2.5–4 × 1–1.5 mm, oblong-lanceolate to ovate-lanceolate, rounded to subacute, entire; veins 5, branching and reticulating; laminar glands black, punctiform to striiform, proximally dense, distally sparser; marginal glands black, few, irregular or only 1–2. Petals 5, bright? yellow, not tinged red?, c. 7–8 mm long, c. 2–2.5 × sepals, open flower not seen; laminar glands black, linear to striiform; marginal glands absent? Stamens c. 30?, slightly shorter than petals; anther gland black. Ovary not seen; styles 3, free, spreading?, 5 mm; stigmas narrow. Capsule (immature) 7 × 4 mm, ovoid. Seeds not seen.
Stony and gravelly streamside; 30–50 m.
Japan (northeast Hokkaidō).
Hypericum nuporoense is known so far only from the type collection, which is in early fruit with fading petals and stamens twisted round the developing capsule. The constantly triangular-lanceolate leaves, shorter, broadly pyramidal inflorescence and petals and sepals with dense black laminar glands distinguish it from 29. H. furusei, whereas these characters all tend in the direction of 31. H. erectum, of which the most similar form (f. vaniotii) differs from it inter alia by the dense corymbiform inflorescence, subequal, rounded to subacute sepals with linear to striiform laminar glands and somewhat smaller leaves.