Rawsonia Harv. & Sond.

Genus

Angiosperms > Malpighiales > Achariaceae

Characteristics

Shrubs or trees. Leaves persistent, alternate, rather leathery, entire to crenate or spinulose-serrate, petiolate, penninerved, stipulate. Flowers small, white or pinkish, polygamous, i.e. the lower ones in the same inflorescence generally ♂, the upper 1–3 hermaphrodite or ♀, in axillary spike-like racemes. Perianth spirally arranged, consisting of 4–6 free, imbricate, concave and unequal sepals (the outer ones the smallest, the inner ones gradually larger), and 4–8 petals, similar to the sepals but successively larger towards the centre of the flower, and each bearing a fleshy glabrous or hairy scale-like basal appendage. Stamens numerous, biseriate in the hermaphrodite, multiseriate in the ♂ flowers, the inner row arising from the receptacle, the outer row attached at the base of the “scales”; filaments short; anthers subsagittate. Ovary on a concave receptacle, 1-locular, with 3–5 multi-ovulate placentas; style very short; stigmas 3–4(–5), radiate. Fruit berry-like when first ripe, but tardily longitudinally dehiscent when dry into 3–5 sections; pericarp hard. Seeds few, subglobose-angular; aril pergamaceous.
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Petals similar to the sepals but rather larger, with petaloid scales larger than the petals, opposite each petal, and with a fleshy gland at their base.
Stamens numerous, the inner row arising from the receptacle, the outer attached at the base to the petaloid scales.
Ovary on a convex receptacle, 1-locular with 4–5 parietal multiovulate placentas; style very short; stigmas 4–5.
Leaves petiolate; lamina often rather leathery, usually oblong or elliptic-oblong, margins spinulose-serrate.
Fruit berry-like when first ripe but tardily longitudinally dehiscent when dry into 4–5 sections.
Flowers in axillary spike-like or lax racemes, bisexual or male.
Sepals 4–5, free, imbricate, concave, unequal.
Evergreen shrubs or small trees.
Seeds few, subglobose.
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Foliage retention evergreen
Sexuality hermaphrodite
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Cultivation

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Images

Rawsonia unspecified picture

Identifiers

LSID urn:lsid:ipni.org:names:4384-1
WFO ID wfo-4000032617
COL ID 77BX
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Rawsonia

Lower taxons

Rawsonia burtt-davyi Rawsonia lucida