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
Leaves leathery. Inflorescence many-flowered. Seeds oblong,
winged.--Species 1 (_Ph. tenax_ Forst., New-Zealand-flax). Cultivated
in South Africa and the Mascarene Islands. Yields fibre and is used as
an ornamental and medicinal plant. =Phormium= Forst.
77. Perianth-segments globosely-campanulately converging, slightly
cohering at the base. Stamens with the filaments thickened at the apex
and with sagittate basifixed anthers. Ovary 3-celled, each cell with an
incomplete partition and numerous ovules. Leaves serrate, crowded at
the top of the woody stem.--Species 2. Cultivated and naturalised in
the Mascarene Islands and the island of Zanzibar. They yield fibre and
starch and are used as ornamental plants. [Tribe YUCCEAE.] =Yucca= L.
Perianth-segments spreading towards the tip. Stamens with thread-like
filaments or with dorsifixed anthers. Ovary 3-celled with 1-8 ovules in
each cell, or 1-celled. [Tribe DRACAENEAE.] 78
78. Ovary 1-celled with numerous ovules. Style short or wanting.
Anthers attached at or near the base, opening laterally. Flowers
polygamous, in panicles formed of spikes. Leaves all radical.--Species
1. Mascarene Islands. It yields fibre and is used as an ornamental
plant. =Astelia= Banks & Soland.
Ovary 3-celled with 1-8 ovules in each cell. Anthers attached by the
back. 79
79. Ovules 4-8 in each ovary-cell. Style short and thick.
Perianth-segments almost free. Flowers in repeatedly branched panicles.
Stem woody.--Species 2. Mascarene Islands. Used as ornamental plants.
(Under _Cordyline_ Commers.) =Cohnia= Kunth
Ovules solitary in each ovary-cell. Style long and slender.
Perianth-segments evidently united. 80
80. Leaves all radical, springing from a short root-stock,
cartilaginous. Flowers in racemes composed of fascicles. Ovary sessile
with a large base. Fruit an achene with a membranous pericarp.
Seed-coat fleshy.--Species 25. Tropical and South Africa. Many of
them yield fibre and are used as ornamental plants. “Bowstring-hemp.”
(_Sanseverinia_ Petagna). =Sansevieria= Thunb.
Leaves springing from a sometimes very short woody stem, herbaceous or
leathery. Fruit a berry.--Species 65. Tropical and South Africa and
Canary Islands. Several species yield a resin (dragon’s blood) employed
medicinally and industrially; some are used for plaiting-work or as
ornamental plants. =Dracaena= Vand.
FAMILY 33. HAEMODORACEAE
Herbs. Leaves narrow, 2-ranked. Flowers in racemes or panicles, rarely
solitary, hermaphrodite. Perianth yellow; segments 6, petal-like,
free or shortly united at the base. Stamens 3, opposite the inner
perianth-segments and attached at their base. Anthers turned inwards.
Ovary 3-celled; two cells sometimes sterile. Style simple, with a
simple stigma, rarely 3-parted. Fruit a loculicidal capsule. Seeds
flat. Embryo small, enclosed by the base of the albumen.--Genera 4,
species 6. South Africa.
1. Ovary superior, 1-3-celled, with 1 ovule in each cell. 2
Ovary inferior, 3-celled. Flowers regular. 3
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