Page 169 - Biology_F5

Biology for Advanced Level Secondary Schools

The Lathyrus flower is zygomorphic,
hermaphrodite, calyx with five fused
sepals, corolla with five free petals,
androecium with ten stamens (nine fused
stamens and one free stamen); and a
superior ovary with one free carpel. Floral
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formula of Lathyrus is;

The Ipomoea flower is actinomorphic,
bisexual, calyx with five free sepals,
corolla with five fused petals, androecium
with five free stamens united with petals,
and gynoecium is superior with two fused
carpels.
Floral formula of Ipomoea is;

Figure 3.40: A photo of a common Hibiscus
rosa-sinensis found in several places of Tanzania
Floral formulae and floral diagrams of The floral formula of Hibiscus flower
a selected flower with bracts (bracteate) and bracteoles

The genus Hibiscus represents several (bracteolate), radial symmetry, bisexual,
species of different habit ranging from fused five sepals (calyx), free five petals
herbaceous species to woody sppecies (corolla) fused with infinite androecium,
such as shrubs and trees. The genus which and five fused gymnoecium (hypogynous).
falls under family malvaceae (Figure
3.40) is cosmopolitan in distribution and it Floral formula of Hibiscus spp:
is native to temperate and tropical regions.
there are wide range of wild species but
some shrub species are common garden

plants.
Floral diagram of Hibiscus flower
The schematic cross-section of Hibiscus
flower is presented in structural form to
depict the arrangement of floral parts as

projected in transverse or horizontal plane
(Figure 3.41).

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