Oxyanthus Dc.

Genus

Angiosperms > Gentianales > Rubiaceae

Characteristics

Shrubs to small trees or rarely lianes, often sweetly scented in dry state. Leaves petiolate; domatia often present as hairy tufts in the nerve axils; stipules green in dry state, usually somewhat coriaceous, erect, persistent, sometimes ± connate at base. Flowers hermaphrodite, 5-merous, subsessile to pedicellate in lax or contracted, elongate (sometimes raceme-like) or corymbose panicles, lateral at successive nodes; bracteoles scarcely to well developed. Calyx-tube turbinate to ellipsoid or somewhat cylindrical; limb with distinct tubular part and short to long, usually narrow lobes. Corolla white; tube long, very narrowly tubular, the throat glabrous to sparsely pubescent; lobes narrow, contorted, overlapping to the left. Stamens fully or partly exserted, attached at the throat; anthers sessile or subsessile, apiculate or acuminate, sometimes prolonged at the base into sterile appendages. Pollen-grains in tetrads. Disc annular. Style very slender, glabrous, exserted, with a small club-shaped or fusiform swelling (stigmatic club) bearing 2 stigmatic lips at its apex. Ovary 1–2-locular, but the 2 locules are practically confluent, the two placentas joined only at the extremities; ovules very numerous, not immersed in the fleshy placentas. Fruit globose, ellipsoid or fusiform, ± fleshy in life, sometimes crowned with the persistent calyx-limb. Seeds sometimes held together with placental tissue, compressed-ellipsoid, quite large, 4–8 mm. long; testa ornamented with concentric horseshoe-shaped to fingerprint-like striations.
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Inflorescences only one per node on alternate sides at successive nodes (see TAB. 75/6) and 1 per branch or 1–several per branch for each season’s growth, lax or contracted, of elongate (catkin-like when very young) or corymbose panicles; bracts/bracteoles lanceolate to narrowly ovate or filiform to subulate from a triangular base; peduncles short; bractelets similar to bracts but smaller or absent.
Ovary 1–2-locular, but the 2 locules ± confluent, the 2 placentas joined only at the extremities; ovules very numerous, not immersed within the fleshy placentas; style very slender, glabrous; pollen presenter exserted, small club-shaped or fusiform, bearing 2 stigmatic lips at its apex.
Leaves petiolate; domatia often present as tufts of hairs in the nerve axils or as lines of hairs along the midrib just above and/or below the nerve axils; stipules green in the dry state, usually somewhat coriaceous, erect, persistent, sometimes ± connate at base.
Stamens fully or partly exserted, attached within the throat; anthers sessile or subsessile, apiculate or with an acuminate appendage at apex, sometimes prolonged at the base into sterile appendages; pollen grains in tetrads.
Seeds usually free but sometimes held together with placental tissue, compressed-ellipsoid, quite large, 4–8 mm long; testa ornamented with concentric horseshoe-shaped to fingerprint-like striations.
Shrubs, small trees or occasionally dwarf single-stemmed shrubs, rarely rhizomatous, the vegetative parts often sweet-scented in the dry state.
Corolla white; tube very narrowly cylindrical, the throat glabrous to sparsely pubescent; lobes narrow, contorted, overlapping to the left.
Calyx tube turbinate to ellipsoid or somewhat cylindrical; limb-tube short to long; lobes usually narrow.
Fruit globose, ellipsoid or fusiform, ± fleshy in life, sometimes crowned with the persistent calyx limb.
Flowers hermaphrodite, 5-merous, subsessile to pedicellate.
Disk annular.
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Hardiness (USDA) 9-12

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