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
15. (9.) Style simple, sometimes very short, with 1-3 stigmas. Fruit
separating into 3 dehiscing mericarps. Seed-coat hard. Hairy plants.
Leaves alternate, entire, nearly always exstipulate. Flowers solitary
or in spikes, racemes, or heads.--Species 80. South Africa, southern
Central Africa, Madagascar and the neighbouring islands. Some are used
as ornamental plants. =Phylica= L.
Style 2-4-cleft. Leaves stipulate. Flowers in cymes sometimes arranged
in false spikes or racemes, very rarely flowers solitary. 16
16. Receptacle top-shaped, not prolonged beyond the ovary. Fruit
separating into 3 elastically dehiscent mericarps. Erect shrubs or low
trees. Leaves alternate, 3-nerved at the base, serrate. Flowers in
axillary cymes.--Species 1. East and South-east Africa, including the
islands. =Colubrina= Brongn.
Receptacle prolonged beyond the ovary. 17
17. Stem tree-like. Leaves opposite, entire, penninerved, hairy
beneath. Flowers in axillary cymes. Anthers dehiscing by longitudinal
slits which are confluent at the apex. Fruit separating into dehiscent
mericarps; epicarp somewhat fleshy.--Species 1. Island of St. Helena.
=Nesiota= Hook. fil.
Stem shrubby, half-shrubby, or climbing. Leaves alternate. Flowers in
axillary and terminal inflorescences. 18
18. Stem not climbing, without tendrils. Leaves few, lanceolate,
entire. Flowers solitary or in few-flowered cymes.--Species 1. South
Africa (Betchuanaland). =Marlothia= Engl.
Stem climbing, bearing tendrils. Leaves oval. Flowers in usually
many-flowered cymes, false spikes, or panicles. Mericarps 3, separating
from a central column. 19
19. Flowers in cymes. Disc entire. Fruit wingless; mericarps dehiscing
elastically. Leaves entire, penninerved.--Species 3. Tropical and South
Africa. =Helinus= E. Mey.
Flowers in false spikes or racemes. Disc usually lobed. Fruit 3-winged;
mericarps dehiscing by a narrow slit or indehiscent--Species 12.
Tropics. Some are used medicinally. =Gouania= L.
FAMILY 138. VITACEAE.
Shrubs or trees, usually climbing, rarely (_Cissus_) herbs or
undershrubs. Leaves alternate, stipulate. Flowers regular, in cymose
inflorescences. Calyx small, entire or lobed. Petals 3-7, sometimes
cohering at the base or at the apex, valvate in bud. Stamens as many as
and opposite to the petals, inserted outside the hypogynous, sometimes
indistinct disc. Anthers opening inwards by two longitudinal slits.
Ovary 2-8-celled, seated upon the disc or more or less sunk in it.
Ovules solitary in each cell or two side by side, ascending, inverted,
with ventral raphe. Style simple, sometimes indistinct. Stigma entire
or 2-4-lobed. Fruit a berry, usually septate. Seeds with a bony or
crustaceous testa and a fleshy or cartilaginous, more or less ruminate
albumen enclosing a small straight embryo.--Genera 5, species 200.
(_AMPELIDEAE_.) (Plate 89.)
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