DESKTOP 3240 - PERIWINKLE

Vinca major, with the common names bigleaf periwinkle, large periwinkle, greater periwinkle and blue periwinkle, is species of flowering plant in the family Apocynaceae, native to the western Mediterranean. Growing to 25 cm tall and spreading indefinitely, it is an evergreen perennial. Vinca major is a commonly grown ornamental plant in temperate gardens for its evergreen foliage, spring flowers, and groundcover or vine use. It can become weedy, especially in moister climates.

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DESKTOP 3100 - TWEEDIA

Oxypetalum coeruleum is a species of flowering plant, native to South America from southern Brazil to Uruguay, in the Apocynaceae family. The synonymous name Tweedia caerulea is also used. Growing to 100 cm, it is a straggling evergreen perennial with heart shaped, gray-green, downy leaves. It is grown for its clear pale blue, star-shaped flowers, which are long lasting and cut well.

The summer flowers age to purple and are followed by 30 cm long, boat-shaped seed pods. The seeds have downy parachute-like tufts (cypsela). The cultivar 'Alba' has white flowers, while 'Rosea' has pink flowers. Oxypetalum coeruleum requires full sun in a well-drained soil that is dry.

Propagation is via seed. With a minimum temperature range of 3–5 °C, it can be grown outdoors in a frost-free, sheltered environment. Alternatively it can be grown as an annual. This plant has gained the Royal Horticultural Society's Award of Garden Merit.

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DESKTOP 1654 - CATHARANTHUS

Catharanthus is a genus of flowering plants in the dogbane family, Apocynaceae. Like genus Vinca, they are known commonly as periwinkles. There are eight known species. Seven are endemic to Madagascar, though one, C. roseus, is widely naturalised around the world. The eighth species, C. pusillus, is native to India and Sri Lanka. The name Catharanthus comes from the Greek for "pure flower".

These are perennial herbs with oppositely or almost oppositely arranged leaves. Flowers are usually solitary in the leaf axils. Each has a calyx with five long, narrow lobes and a corolla with a tubular throat and five lobes.

Catharanthus roseus, known formerly as Vinca rosea, is a main source of vinca alkaloids, now sometimes called catharanthus alkaloids. The plant produces about 130 of these compounds, including vinblastine and vincristine, two drugs used to treat cancer.

Catharanthus roseus is also cultivated as an ornamental plant in gardens. Several cultivars have been bred to produce flowers in many shades of pink, red, lilac, and white, or in light shades with dark throats.

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DESKTOP 653 - ADENIUM

Adenium obesum is a species of flowering plant in the dogbane family, Apocynaceae, that is native to the Sahel regions, south of the Sahara (from Mauritania and Senegal to Sudan), and tropical and subtropical eastern and southern Africa and Arabia. Common names include Sabi star, kudu, mock azalea, impala lily and desert rose.

It is an evergreen or drought-deciduous succulent shrub (which can also lose its leaves during cold spells, or according to the subspecies or cultivar). It can grow to 1–3 m in height, with pachycaul stems and a stout, swollen basal caudex. The leaves are spirally arranged, clustered toward the tips of the shoots, simple entire, leathery in texture, 5–15 cm long and 1–8 cm broad. The flowers are tubular, 2–5 cm long, with the outer portion 4–6 cm diameter with five petals, resembling those of other related genera such as Plumeria and Nerium. The flowers tend to red and pink, often with a whitish blush outward of the throat.

Adenium obesum is a popular houseplant and bonsai in temperate regions. It requires a sunny location and a minimum indoor temperature in winter of 10 °C. It thrives on a xeric watering regime as required by cacti. A. obesum is typically propagated by seed or stem cuttings. The numerous hybrids are propagated mainly by grafting on to seedling rootstock. While plants grown from seed are more likely to have the swollen caudex at a young age, with time many cutting-grown plants cannot be distinguished from seedlings. This plant has gained the Royal Horticultural Society's Award of Garden Merit. The toxic sap of its roots and stems is used as arrow poison for hunting large game throughout much of Africa, and as a fish toxin.

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