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Hypericum tetrapetalum Lam.
Section: sect. MyriandraSubsection: subsect. Ascyrum
Shrub or perennial herb woody at base, 0.2-1 m tall, erect, often unbranched, branches divaricate or ascending. Stems green, (2)4- lined and ancipitous when young, becoming 2-lined to terete; cortex exfoliating in strips or flakes; bark thin, reddish brown, not corky. Leaves sessile, (5-)8-35 x 4-15 mm, oblong-ovate or ovate to triangular-ovate, margin subrecurved, paler beneath, not glaucous, coriaceous, eventually deciduous at basal articulation, apex apiculate or obtuse to rounded, base cordate-amplexicaul; venation: only one pair of basal laterals visible; laminar glands dense, large; inframarginal glands dense. Inflorescence l(3)-flowered with branching pseudo-dichotomous, occasionally with short lateral branches from up to 3 nodes below; pedicels 3-12 mm long; bracts foliar. Flowers 20-30 mm or more in diam.; buds compressed-subglobose. Sepals 4, markedly unequal, not? enlarging in fruit; outer 7-13(-15) x 5.5- 9(-10) mm, broadly ovate, foliaceous, subapiculate to obtuse, base cordate, basal veins 3(5), unbranched; inner 7-15 x 2-c. 3 mm, narrowly lanceolate, acute, basal veins 1-3. Petals 4, bright yellow, 10-15 (or larger?) x 7-10 mm, 1.2-1.3 x sepals, obovate-oblong, with apiculus lateral, acute to incurved, acuminate. Stamens c. 100, longest c. 4.5-6.5, c. 0.45 x petals. Ovary 3-merous, 3-3.5 x 1.6-2 mm, pyramidal-ovoid to ellipsoid-ovoid, acute, placentation parietal; styles 3, 3-3.5 mm, 1-1.2 x ovary, divergent distally. Capsule c. 5-6 x 3.5-4, broadly ellipsoid-ovoid to subglobose, 3-lobed. Seeds blackish brown, c. 0.7 mm long, ecarinate; testa shallowly scalariform.