Leptactina Hook.F.

Genus

Angiosperms > Gentianales > Rubiaceae

Characteristics

Shrubs or small trees, nearly always erect, rarely slightly scrambling or one species a prostrate shrubby herb. Leaves petiolate, opposite, sometimes slightly unequal, usually with distinct pubescent domatia; stipules usually conspicuous. Flowers mostly rather large, hermaphrodite, 4–6-merous in few–many-flowered cymes at the extremities of terminal shoots and lateral branches. Calyx-tube ellipsoid or obconic; tubular part of limb ± obsolete or only evident in fruit; lobes contorted, foliaceous, subequal, mostly erect during flowering, venose, persistent. Corolla-tube long, narrowly cylindrical; lobes linear or linear-lanceolate to elliptic, usually long and pointed, spreading, contorted in bud. Stamens sessile, inserted below the level of the throat, included or apex of anthers exserted, occasionally locellate; pollen grains single. Ovary 2-locular; ovules numerous on placentas attached to the septum; style usually with pollen-collecting hairs at the level of the anthers; stigma with 2 linear lobes exserted or mostly included. Fruit subglobose or oblong to oblong-conic, scarcely or slightly fleshy, often longitudinally ribbed. Seeds numerous, small, mostly angular, smooth and glossy, with a hilar pit.
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Ovary 2-locular; ovules numerous on placentas attached to the septum; style usually with pollen collecting hairs at the level of the anthers; stigma/pollen presenter with 2 linear lobes, exserted or mostly included.
Calyx tube ellipsoid or obconic; limb-tube ± obsolete or only evident in fruit; lobes contorted, foliaceous, ± equal, mostly erect during flowering, venose, persistent.
Corolla tube long, narrowly cylindrical; lobes linear or linear-lanceolate to elliptic, usually long and pointed, spreading, contorted in the bud.
Flowers mostly rather large, hermaphrodite, 4–6-merous in few-to many-flowered cymes at the extremities of terminal shoots and lateral branches.
Leaves petiolate, opposite, sometimes slightly unequal in size, usually with distinct pubescent domatia; stipules usually conspicuous.
Shrubs or small trees, nearly always erect, rarely slightly scrambling or one species a prostrate subshrub.
Fruit subglobose or oblong to oblong-conic, scarcely or slightly fleshy, often longitudinally ribbed.
Stamens sessile, inserted below the level of the throat, included or anther apices exserted.
Seeds numerous, small, mostly angular, smooth and glossy.
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Hardiness (USDA) 9-12

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