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Nomenclature
Hypericum siamense N. Robson
Nomenclature
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Genus: HypericumSection: sect. Ascyreia
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Synonyms: 2
DIAGNOSTIC DESCRIPTION
Shrub 0-3-3 m tall, bushy, with short ascending lateral branches. Stems red, 4-lined and ancipitous when young, eventually terete; internodes 5-20 mm, long, shorter than leaves, bark grey-brown. Leaves subsessile or petiolate, with petiole 1-2 mm long, broad; lamina 25-36 x 7-18 mm, oblong (lower) to elliptic (upper), acute to apiculate-obtuse, margin plane, base ± broadly cuneate to rounded or subauriculate, paler beneath, not glaucous, chartaceous; venation: 1-3 pairs main laterals, the outer joining upper laterals to become intramarginal vein, all dark and easily visible (when dry), with lax or scarcely visible tertiary reticulum; laminar glands very short streaks and dots; ventral glands sparse to dense. Inflorescence 1-5-flowered, from 1-2 nodes, subcorymbiform, pedicels 10 mm, long; bracts narrowly elliptic, persistent. Flowers 40-50 mm in diam., shallowly cyathiform ?, buds ovoid, acute to subacute. Sepals 8-12 x 3-6 mm, free, imbricate, unequal, spreading to reflexed in bud and fruit, triangular-ovate, acute, margin entire, midrib visible below, veins slightly prominent; laminar glands numerous, linear, interrupted towards apex. Petals deep ? golden yellow, tinged red dorsally, slightly incurved, 20-24 x 12-17 mm, 2-2.5 x sepals, narrowly to broadly obovate, with apiculus obtuse to rounded, lateral, margin entire, eglandular. Stamen fascicles 5, each with c. 45-50 stamens, longest 10-11 mm. long, c. 0.35-0.5 x petals; anthers golden yellow to orange. Ovary 5-7 x 3-3.5 mm, ovoid to narrowly ovoid-conic; styles 2.5-6 mm long, 0.4-0.8(-l) x ovary, free, outcurved near apex; stigmas small. Capsule c. 15-17 x 10-12 mm, ovoid-conic. Seeds pale orange-brown (? immature), c. 1.0 mm long, cylindric, narrowly carinate, shallowly linear-reticulate to linear-foveolate.