The flowering plants of Africa: An analytical key to the genera of African phanerogramsThonner, Franz
Science
The flowering plants of Africa: An analytical key to the genera of African phanerograms
Thonner, Franz
Angiosperms -- Africa; Plants -- Africa
Succulent herbs. Leaves herbaceous, undivided, penninerved, without
stipules. Flowers solitary or in clusters or racemes, without
bracteoles, irregular, hermaphrodite. Sepals 3, rarely 5, imbricate
in bud, the hindmost more or less distinctly spurred. Petals 3 or 5.
Stamens 5; filaments short and broad; anthers united, turned inwards,
opening towards the apex. Disc none. Ovary superior, 5-celled. Ovules
3 or more, in the inner angle of each cell, pendulous, inverted, with
dorsal raphe. Style 1; stigmas 1 or 5. Fruit succulent, dehiscing
elastically. Seeds exalbuminous. (Under _GERANIACEAE_.) (Plate 87.)
Genus 1, species 100. Tropical and South Africa. Some are used as
ornamental plants (balsams), others yield dyes, medicaments, or edible
oily seeds. (Including _Trimorphopetalum_ Bak.) =Impatiens= L.
ORDER RHAMNALES
FAMILY 137. RHAMNACEAE
Shrubs or trees, rarely (_Helinus_) undershrubs. Leaves undivided,
stipulate, more rarely (_Phylica_) exstipulate. Flowers regular,
hermaphrodite or polygamous. Receptacle more or less cup-shaped. Sepals
4-5, valvate in bud. Petals 4-5 or 0. Stamens as many as and alternate
with the sepals. Anthers opening by 1-2 slits. Disc within the stamens,
sometimes indistinct. Ovary 2-4-celled, sometimes not quite completely
septate, rarely (_Maesopsis_) 1-celled. Ovules solitary in each cell,
basal, inverted. Style undivided or cleft. Seeds with a large, straight
embryo.--Genera 18, species 140. (Plate 88.)
1. Ovary superior or almost so. 2
Ovary inferior or half-inferior. 9
2. Ovary 1-celled. Stigma 5-lobed. Fruit one-seeded, indehiscent.
Leaves opposite or nearly so, penninerved.--Species 2. Equatorial
regions. The fruits are edible. (Including _Karlea_ Pierre) =Maesopsis=
Engl.
Ovary completely or almost completely 2-4-celled. Stigma 2-4-lobed, or
2-4 stigmas. 3
3. Anthers opening outwards. Sepals with a far projecting ledge on
the inside. Disc ring-shaped. Style undivided, with a 2-lobed stigma.
Leaves opposite or nearly so, crenate, with 2-4 lateral nerves on each
side. Flowers in axillary spikes or in terminal panicles.--Species 1.
Abyssinia. =Lamellisepalum= Engl.
Anthers dehiscing inwards or laterally. Flowers solitary or in cymes,
rarely in racemes or panicles, but then style 2-4-cleft or with 3
stigmas. 4
4. Leaves 3-, more rarely 5-nerved from the base. Style 2-4-cleft.
Fruit wingless, fleshy, indehiscent, with a 1-4-celled stone.--Species
10. Some of them yield timber, tanning and dyeing materials, gum-lac,
food for silk-worms, medicaments, and edible fruits (jujubes) from
which a sort of bread and a beverage are prepared; others have
poisonous fruits; some are used as hedge plants. =Zizyphus= Juss.
Leaves penninerved. 5
5. Flowers in terminal panicles, 5-merous. Stigmas 3. Fruit with 3
stones. Shrubs with spiny branches. Leaves opposite.--Species 1.
Northern East Africa. The fruits are edible. =Sageretia= Brongn.
Flowers in axillary inflorescences. 6
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