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
Trees or shrubs. Leaves without stipules, usually pinnate. Flowers
regular, mostly panicled. Petals 3-6, usually free. Stamens as many or
more frequently twice as many as the petals. Filaments usually united.
Anthers 2-celled, opening inwards or laterally by longitudinal slits.
Ovary superior, usually 2-or more-celled. Ovules inverted. Style simple
or wanting; stigma entire or lobed.--Genera 23, species 150. (Including
_AITONIEAE_, _CEDRELEAE_, and _PTAEROXYLEAE_.) (Plate 76.)
1. Filaments free. Ovule 1 in each ovary-cell. Seeds winged. Leaves
pinnate. [Subfamily =CEDRELOIDEAE=] 2
Filaments more or less united into a tube. 3
2. Ovary and fruit 2-celled. Petals 4. Stamens 4.--Species 2. South and
East Africa. They yield timber (sneezewood). =Ptaeroxylon= Eckl. & Zeyh.
Ovary and fruit 5-celled.--Species 1. Madagascar. =Cedrelopsis= Baill.
[Illustration: BURSERACEAE.
_FLOW. PL. AFR._
_Pl. 75._
J. Fleischmann del.
Pachylobus edulis G. Don
_A_ Flowering branch. _B_ Male flower cut lengthwise. _C_ Stamen. _D_
Female flower cut lengthwise. _E_ Staminode. _F_ Cross-section of
ovary.]
[Illustration: MELIACEAE.
_FLOW. PL. AFR._
_Pl. 76._
J. Fleischmann del.
Trichilia retusa Oliv.
_A_ Flowering branch. _B_ Flower. _C_ Flower cut lengthwise. _D_
Anther.]
3. Seeds winged. Ovules 4 or more, rarely 2 in each ovary-cell. Stamens
8-10. [Subfamily =SWIETENIOIDEAE=.] 4
Seeds not winged. Ovules 1-2, rarely 3-8 in each ovary-cell or on each
placenta. [Subfamily =MELIOIDEAE=.] 9
4. Ovules 2 in each ovary-cell. Ovary 5-celled. Stigma small. Disc
wanting. Anthers 10, seated between the teeth of the staminal tube.
Leaves whorled, undivided. Flowers in panicles.--Species 2. West
Africa. =Pynaertia= De Wild.
Ovules 4 or more in each ovary-cell. Leaves pinnate. 5
5. Ovules 4 in each ovary-cell. Disc shortly stalk-shaped. Staminal
tube campanulate, the mouth crenate and with short teeth bearing the
anthers. Petals imbricate in bud.--Species 7. Central Africa. =Lovoa=
Harms
Ovules 6 or more in each ovary-cell. 6
6. Ovules 6 in each ovary-cell. Ovary sessile. Disc none. Staminal tube
entire at the mouth, or with short teeth bearing the anthers. Petals
with imbricate aestivation. Flowers 5-merous.--Species 2. Southern West
Africa. =Wulfhorstia= C. DC.
Ovules 12 or more in each ovary-cell. Petals with contorted
aestivation. 7
7. Disc shortly stalk-shaped, connected with the staminal tube by
longitudinal ridges. Seeds winged below. Leaflets entire.--Species 15.
Central Africa. They yield timber, gum, and a dye-stuff. (Including
_Leioptyx_ Pierre, under _Swietenia_ L.) =Entandophragma= C. DC.
Disc cup-or cushion-shaped, not connected with the staminal tube by
longitudinal ridges. 8
8. Disc cup-shaped. Fruit oblong. Seeds about 5 in each cell of the
fruit, winged below.--Species 1. Central Africa. Yields timber and gum.
(Under _Cedrela_ L.) =Pseudocedrela= Harms
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