Description and biology
of Mandevilla

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Mandevilla is Angiosperm (plant with flower and fruit). Hereafter are the main features:

Plant habit:
  • Bushy, half-bushy or climbing, Mandevilla is a vine that thrives depending on the climat. The branches can be as long as 5 meters.

  • When branches become vine, they curle around any kind of support. This behaviour is typical of the Apocynaceae family and the curling generally occurs counter clockwise.

Leaf:
  • In general Mandevilla leaves are evergreen. They are opposed, sometimes whorled. Elliptical shape, oval or long depending on the species.

  • Leaves are simple with whole limbus, acuminate.

  • Mandevilla laxa ("Chilian Jasmin") is one of the rare varieties with deciduous leaves.

Flower and inflorescence:
  • Dipladenia inflorescence is a racem with 1 to 10 flowers. It can be axillary, terminal or sub-terminal. It apears only the branch of the year.

  • Mandevilla flowers are of various sizes depending on the specy: from 2 cm to 12 cm. They are generally constituted of 5 green sepals and 5 colored petals.These latter are shaped in a tub at the basis.

  • Like all Apocynaceae, flowers are actinomorphic, hermaphrodite. Floral formula is: O : (5S) [(5P), 5E] 2C.

  • The gyneocum is constituted of 2 free carpels. They join to form a gluy stigmat called "clavoncule". The ovary is superior or sometimes sub-inferior, and the placentation is marginal. The ovules, between 2 to 200 per carpel, are generally anatropous, unitegumented. We can see 2 to 5 nectariferous scales at the basis of the ovary. These "glands" made the name "dipladenia".

  • The androcea is constituted of 5 epipetalous and alternisetalous staminas. They join the corolla at the floral tube level. Their anthers joined above the des stigmas to form a complex shape called "gynostegous", "gynostegium" or "gynostemous" depending on the author.

  • Sexual organs being specialized, natural pollination mechanism is also specialized making the fruit formation more complicated when it happens under different climat zones than the original one.

Description et biologie des Mandevilla Fruit and seed:
  • Mandevilla fruit is a double follicle (pod type) dry and dehiscent.

  • Seed are small (between 4 and 15 mm) and have hair to facilitate dissemination. They are unitegumented and contain an oily endosperm.

  • Mandevilla ambryo is large and straight. It has leafly cotyledons.

Rooting system:
  • Mandevilla rooting system is principally composed of tuberous roots sensitive to light and air.

Physiological features:
  • Mandevilla produces latex, mainly toxic like for most Apocynaceae.



 

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