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Family Santalaceae

Description: Shrubs, trees and herbs, semiparasitic, usually on roots.

Leaves opposite or alternate, rarely whorled, simple, often reduced and scale-like, entire, sometimes caducous, stipules absent.

Inflorescence a raceme, spike, panicle or cluster, or reduced to a single flower, axillary or terminal, usually bracteate, sometimes bracteolate. Flowers actinomorphic, bisexual or unisexual and then plants monoecious or dioecious. Perianth 1-whorled; tepals 3–5 (rarely 6), valvate, inserted on a shallow to cup-like receptacle. Stamens as many as tepals and opposite them. Ovary solitary, superior or inferior, 1–5 locular with 1–5 ovules or the ovules not differentiated. Disc present, often thickened and lobed at the margin, rarely absent. Style usually very short, stigma entire or 2–5 lobed.

Fruit an indehiscent nut or drupe, the mesocarp often somewhat fleshy, receptacle often enlarged, fleshy and coloured; seed 1.


Distribution and occurrence: World: c. 36 genera, c. 500 species, ± cosmopolitan, chiefly tropical and warm dry regions. Australia: 10 genera, 46 species (42 species endemic), all States.

External links:
Angiosperm Phylogeny Website (Family: Santalaceae, Order: Santalales)
Wikipedia

Text by B. Wiecek
Taxon concept:

 Key to the genera 
1Leaves well-developed2
Leaves reduced, rudimentary or scale-like, or absent3
2Leaves alternate; ovary superiorExocarpos
Leaves opposite, rarely alternate; ovary inferior or half-inferior
                       Back to 1
Santalum
3Slender perennial herbs; inflorescences 1-flowered; fruit a nut enclosed by a persistent hypanthium; peduncles united at base with the subtending leafThesium
Shrubs or small trees
                       Back to 1
4
4Wiry glabrous shrub; leaves absent; branches resinous and lustrousOmphacomeria
Shrubs or trees, leaves present at least on young branches though often caducous; branches neither resinous nor lustrous
                       Back to 3
5
5Flowers in spikes or clusters, each flower in a notch of the rachis or in the axil of a minute scale-like bract; ovary superior; fruit fleshy, pedicel often enlarged and fleshy below drupeExocarpos
Flowers in axillary racemes or clusters or solitary, subtended by a bract or bracteoles; ovary inferior or half-inferior; fruit dry or fleshy, crowned by the persistent perianth
                       Back to 4
6
6Flowers solitary, subtended by an often caducous bract; drupe succulentLeptomeria
Flowers clustered, occasionally solitary, subtended by 2 or more bracts; drupe scarcely succulent
                       Back to 5
Choretrum

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