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Nomenclature
Hypericum subcordatum (R. Keller) N. Robson
Nomenclature
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Genus: HypericumSection: sect. Monanthema
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Synonyms: 4
DIAGNOSTIC DESCRIPTION
Perennial herb 0.01-0.07 m tall, erect from creeping and rooting base with stems unbranched or branched from upper 1(2) nodes. Stems slender, eglandular; internodes 2-lined above, terete below, 30-40 mm, longer than leaves. Leaves all petiolate, with petiole 1-1.5 mm; lamina 10-16 ´ 8-12 mm, broadly elliptic or oblong-elliptic to obovate, paler (or subglaucous?) beneath; apex rounded, margin entire, base cuneate to truncate (or uppermost subcordate); veins: 3 pairs of laterals from lower third or lower, tertiary reticulation rather dense, obscure; laminar glands dense, small, pale or sometimes a few black, scattered; marginal glands dense or subirregular, black. Inflorescence (1-)3-5-flowered, occasionally with branches from 1(2) nodes below, the whole corymbiform or bifurcating to subcylindric; pedicels 2-2.5 mm; bracts and bracteoles foliar, entire. Flowers c. (8-)10-12 mm in diam., stellate; buds ellipsoid? Sepals 5, subequal, 3-4.5 ´ 0.8-1.2 mm, oblong-lanceolate to lanceolate, acute, margin entire; veins 5, unbranched; laminar glands linear to (distally) punctiform, black; marginal glands few, sessile or submarginal, all or most distal, black. Petals 5, golden? yellow, 4.5-6 ´ 1-1.5 mm, 1.35-1.5 ´ sepals, narrowly elliptic, entire, laminar glands few, black, linear to striiform, marginal glands few, black, subapical or absent. Stamens 17-20, '3'-fascicled, longest 4-5.5 mm, c. 0.9 ´ petals; anther gland black. Ovary 3(4)-locular c. 2 ´ 1 mm, ellipsoid; styles 3(4), c. 1.7-2 mm, c. 0.85-1 ´ ovary, narrowly or scarcely capitate. Capsule 4.8-6 ´ 3.5-4 mm, ovoid to subglobose; valves densely longitudinally vittate. Seeds yellow-brown, 0.6 mm, cylindric; testa shallowly finely scalariform.