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Family Loganiaceae

Description: Trees, shrubs, woody climbers or herbs; stipules interpetiolar, often reduced to a stipular line, sometimes intrapetiolar.

Leaves usually decussate, simple; margins ± entire.

Inflorescence cymose, sometimes reduced and 1-flowered. Flowers actinomorphic, usually bisexual, or if unisexual then plants dioecious; 5-merous or sometimes 4-merous. Calyx united or free. Corolla united, usually whitish, cream-coloured to yellowish, usually fragrant (sometimes unpleasantly so); lobes valvate, imbricate or contorted in bud. Stamens same number as corolla lobes, inserted on corolla tube; anthers 2-locular, usually basifixed, dehiscence introrse by longitudinal slits. Ovary superior or rarely semi-inferior, 2-locular; ovules 1–many; style usually 1 or rarely 2 (Mitrasacme and Phyllangium).

Fruit capsular, berry-like or drupaceous; seeds 1–many.


Distribution and occurrence: World: 16 genera, c. 460 species, tropical & subtropical, with a few extending to warm temperate regions. Australia: 8 genera, c. 97 species, all States.

External links:
Angiosperm Phylogeny Website (Family: Loganiaceae, Order: Gentianales)
Wikipedia

Text by B. J. Conn, updated by K.L. Gibbons, July 2019.
Taxon concept:

 Key to the genera 
1Herbs2
Trees or shrubs4
2Calyx, corolla and androecium 4-merous, or calyx absent3
Calyx, corolla and androecium 5-merous
                       Back to 1
Orianthera
3Calyx absent; corolla and capsule enclosed in a two-lobed foliaceous involucre; ovary semi-inferiorPhyllangium
Calyx present, involucre absent; ovary superior
                       Back to 2
Mitrasacme
4Fruit indehiscent, berry-like; leaves with 3–7 veins from the base; axillary spines usually presentStrychnos
Fruit a two-valved capsule; leaves penniveined; spines absent
                       Back to 1
5
5Seeds embedded in fleshy placentas; capsules dehiscing almost to base, with valves ± deciduousGeniostoma
Seeds not embedded in fleshy placentas; capsules only dehiscing on distal half, with valves persistent and secondarily separating from apex to base
                       Back to 4
6
6Stamens inserted in middle of corolla tube, anthers included in corolla tube; apex of calyx lobes obtuse; flowers unisexualLogania
Stamens inserted in mouth of corolla tube, anthers exserted from corolla tube; apex of calyx lobes acute; flowers bisexual
                       Back to 5
Orianthera

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