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Vinca difformis in habitat, Cáceres, Spain. Vinca plants are subshrubs or herbaceous, and have slender trailing stems 1–2 m (3 + 1 ⁄ 2 – 6 + 1 ⁄ 2 ft) long but not growing more than 20–70 cm (8– 27 + 1 ⁄ 2 in) above ground; the stems frequently take root where they touch the ground, enabling the plant to spread widely.
Vinpocetine (ethyl apovincaminate) is a synthetic derivative of the vinca alkaloid vincamine, differing by the removal of a hydroxyl group and by being the ethyl rather than the methyl ester of the underlying carboxylic acid. Vincamine is extracted from either the seeds of Voacanga africana or the leaves of Vinca minor (lesser periwinkle).
The (single) flowers have the characteristic 'pinwheel' shape also seen in other genera in the family Apocynaceae such as Vinca and Nerium. Both single and double-flowered forms are cultivated, the flowers of both forms being white. The plant blooms in spring but flowers appear sporadically all year. The flowers have a pleasing fragrance. [5]
Vinca herbacea is a herbaceous perennial growing as a trailing vine, spreading along the ground and rooting along the stems to form clonal colonies, growing up to 10–20 centimetres (4–8 in) high. The leaves are opposite, lanceolate, 1–5 cm ( 1 ⁄ 2 –2 in) long and 0.2–3 cm ( 1 ⁄ 8 – 1 + 1 ⁄ 8 in) broad, glossy green with an ...
Vinca major is a trailing vine, spreading along the ground and rooting along the stems to form dense masses of groundcover individually 2–5 metres (6 + 1 ⁄ 2 – 16 + 1 ⁄ 2 ft) across and up to 25 centimetres (10 in) high, perhaps even 50–70 cm (20–28 in).
The newer semi-synthetic chemotherapeutic agent vinorelbine, used in the treatment of non-small-cell lung cancer, [27] [30] can be prepared either from vindoline and catharanthine [27] [31] or from the vinca alkaloid leurosine, [32] in both cases via anhydrovinblastine. [31] The insulin-stimulating vincoline has been isolated from the plant ...
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