Amsonia tab. var. salicifolia is a named variety within the Amsonia genus in the dogbane family, Apocynaceae. It belongs to the group commonly called bluestars and is treated as a variety of Amsonia tabernaemontana. In the UK it flowers from May to June. The genus is primarily native to North America and was named for the American physician John Amson.

Amsonia tab. var. salicifolia (Bluestar) flowers in the UK from May to June and is a member of the dogbane family Apocynaceae.

Amsonia is a genus of flowering plants in the dogbane family, Apocynaceae, first described as a genus in 1788. It is native primarily to North America with one species in East Asia and another in the eastern Mediterranean.

Amsonia tab. var. salicifolia

Bluestar | Amsonia tab. var. salicifolia

Ascelpias verticillata is a taxon in the genus Asclepias within the Apocynaceae family. It flowers from July to September. Gardeners should consult supplier or botanical notes for details of habit and cultivation, as requirements can vary between plants labelled under a single botanical name. Plan for the summer flowering period when siting the plant in the garden.

Ascelpias verticillata flowers from July to September and belongs to the Apocynaceae family.

Ascelpias verticillata

Carissa edulis is an evergreen shrub or small tree in the Apocynaceae, native to parts of tropical Africa. It is valued in cultivation for use as a hedge or a specimen plant. In the UK it flowers from June to September. Best sited in full sun on neutral loam with good drainage in a south-facing, sheltered position and is rated H4 (average hardiness).

Egyptian carissa (Carissa edulis) is an evergreen shrub that flowers June to September and prefers full sun on neutral, well-drained loam in a sheltered.

Carissa is a genus of shrubs or small trees native to tropical and subtropical regions of Africa, Australia and Asia. Until recently about 100 species were listed, but most of them have been relegated to the status of synonyms or assigned to other genera, such as Acokanthera.

Carissa edulis

Egyptian carissa (Carissa edulis) | Evergreen shrub

Ceropegia is a climbing cactus succulent in the family Apocynaceae, with a climbing habit and evergreen foliage. It is grown primarily as a houseplant in the UK and flowers from June to September. It prefers a sheltered, south-facing spot in full sun and a neutral, loam-based free-draining substrate. Treat as a tender plant and avoid exposure to frost.

Ceropegia is a climbing succulent houseplant that flowers June to September and suits a sheltered, south-facing, frost-free position.

Ceropegia is a genus of plants within the family Apocynaceae, native to Africa, southern Asia, and Australia. It was named by Carl Linnaeus, who first described this genus in his Genera plantarum, which appeared in 1737.

Ceropegia

Fockea capensis is a twining, climbing plant in the Apocynaceae native to the Cape Provinces. It has deciduous foliage and a climbing habit that benefits from a support. Flowering occurs from July to September. It is suited to container or indoor culture in the UK when given a sheltered, south‑facing position.

Fockea capensis is a twining, deciduous climber from the Cape Provinces that flowers July to September and suits south-facing, sheltered containers in the.

Fockea is a genus of succulent scrubs native to Africa south of the equator. They are members of the Asclepiadoideae (milkweeds), a subfamily of the dogbane family Apocynaceae.

Fockea capensis

Funtumia elastica is an evergreen African rubber tree that can reach around 25 m. It prefers full sun and a sheltered, south-facing position with moist but well-drained neutral soil. Native to several Central and West African countries, it is commonly grown as a specimen or in conservatories and tropical-style gardens. Growth is most active through spring and summer.

A large evergreen African rubber tree for conservatories or sheltered south-facing sites in the UK; grows to about 25 m and prefers moist, neutral soil.

Funtumia is a genus of flowering plants in the family Apocynaceae first described as a genus in 1900. It is native to Africa.SpeciesFuntumia africana (Benth.) Stapf - widespread from Senegal to Tanzania, south to Zimbabwe Funtumia elastica (Preuss) Stapf - widespread from Senegal to Sudan + Tanzania, south to Zaire

Funtumia elastica

Iré rubber | Funtumia elastica

Hemipogon abietoides is an erect herbaceous member of the Apocynaceae with deciduous foliage. It suits full sun on neutral, well-drained loam and prefers a south-facing, sheltered aspect. Classified H4 (average) for UK hardiness, it is best placed where winter exposure is limited. It flowers from July to September.

Hemipogon abietoides is an erect, deciduous ornamental that prefers full sun, neutral well-drained loam and a south-facing, sheltered site.

Hemipogon abietoides

Hoya carnosa 'Compacta Marginalis' is a compact cultivar of Hoya grown for its waxy foliage and clusters of star-shaped, scented flowers. It belongs to the Apocynaceae family and sits within the Hoya genus. Plants typically produce umbels of flowers in summer. In the UK those blooms appear from June to September.

Hoya carnosa 'Compacta Marginalis' flowers from June to September and is grown for its waxy foliage and scented umbels.

Hoya carnosa 'Compacta Marginalis' (v)

Wax Plant (Hoya carnosa 'Compacta Marginalis')

A climbing, trailing semi-succulent evergreen in the Apocynaceae, Hoya parasitica var. citrina suits conservatory and indoor culture. It carries fleshy, persistent leaves and performs as a climber or trailing vine. Provide full sun in a well-drained, neutral loam on a south- or west-facing, sheltered aspect. It flowers in the UK from June to September.

Hoya parasitica var. citrina is a climbing semi-succulent Hoya for conservatories and homes, flowering in the UK from June to September.

Hoya parasitica var. citrina

Nerium oleander 'Mrs Magnolia Willis Sealy' is a well-branched evergreen shrub in the Apocynaceae grown for its summer-flowering display. It blooms from June to September and performs best in full sun on a south-facing, sheltered site. Accepts chalk, clay, loam or sandy soils across a range of pH values, provided they are moist but well drained. In UK terms it carries an H3 (borderline) hardiness rating and is suitable for patios, containers and sheltered borders.

Nerium oleander 'Mrs Magnolia Willis Sealy' is an evergreen shrub that flowers from June to September and suits south-facing, sheltered sites and.

Nerium oleander 'Mrs Magnolia Willis Sealy' (d)

Nerium oleander 'Mrs Magnolia Willis Sealy' | Summer Blooms

Nerium oleander yellow-flowered is a well-branched evergreen shrub grown for its clusters of yellow flowers. It favours full sun on a south-facing, sheltered site and prefers moist but well-drained soil across chalk, clay, loam or sand. Hardiness is rated H3 (borderline in the UK), so give it protection from the coldest exposures. Flowering runs from June to September.

Oleander (Nerium oleander yellow-flowered) is an evergreen shrub for south-facing, sheltered sites that produces yellow flowers from June to September.

Nerium oleander yellow-flowered

Oleander (Nerium oleander yellow-flowered) | Yellow Blooms

Prestonia quinquangularis is a climbing, deciduous member of the Apocynaceae native to multiple regions of Colombia, including Amazonas and Antioquia. It establishes on south-facing, sheltered sites and benefits from full sun and consistently moist, neutral loam. In the UK it carries an H4 hardiness rating (average) and is grown principally for ornamental value. Flowering occurs from July to September.

Prestonia quinquangularis is a deciduous climbing Apocynaceae for sheltered, south-facing sites that flowers from July to September.

Prestonia quinquangularis

Rhazya orientalis is a species in the Apocynaceae native to the Middle East. It belongs to the genus Rhazya and is chiefly of interest to taxonomists and specialist plant collections. Published information on its horticultural needs is limited. Growers should treat it as a species requiring considered handling and provenance documentation.

Rhazya orientalis is a species of Apocynaceae native to the Middle East.

Rhazya is a genus of plant in family Apocynaceae first described as a genus in 1835. It is native to Egypt and to southwestern Asia from the Arabian Peninsula to north-west India.

Rhazya orientalis

Trachelospermum jasminoides is an evergreen climbing wall shrub that can reach 8–12 metres with a 4–8 metre spread. It grows in full sun to partial shade on well‑drained chalk, loam or sandy soils across acid to alkaline pH. In the UK it is classed H4 (average hardy) and flowers from June to September. The habit is climbing, making it suitable for walls, screens and large structures.

Star jasmine (Trachelospermum jasminoides) is an evergreen climber flowering June to September, suited to sheltered east‑ to west‑facing sites in.

https://en.wikipedia.org/wiki/Trachelospermum_jasminoides

Trachelospermum, is a genus of evergreen woody vines in the dogbane family Apocynaceae, first described as a genus in 1851. All species are native to southern and eastern Asia.

Trachelospermum jasminoides

Star jasmine | Trachelospermum jasminoides

Trachelospermum jasminoides Winter Ruby ('Trared'PBR) is an evergreen climbing plant that flowers in the UK from June to September. It suits sheltered positions on walls or trellises and will tolerate a range of soil pH in well-drained soils. Leaves can take on a bronze tone in winter while remaining evergreen. It is used successfully in containers, courtyards and coastal gardens.

Evergreen climber for sheltered south, west or east aspects with white flowers from June to September and average (H4) hardiness.

Trachelospermum jasminoides Winter Ruby ('Trared'PBR)

Star jasmine [Winter Ruby] | Trachelospermum jasminoides Winter Ruby ('Trared'PBR)

Vinca difformis is a shrub used primarily as a ground cover that bears whitish-blue flowers from May to September. It favours partial to full shade and performs best in sheltered spots. Plant in well-drained sandy or loamy soil with a neutral to slightly acidic pH and keep soil moist but not waterlogged. H4 hardiness indicates average tolerance to UK winter conditions.

Intermediate periwinkle Vinca difformis flowers May to September and suits shaded, well-drained sites as a ground cover or in rock gardens.

https://en.wikipedia.org/wiki/Vinca_difformis

Vinca is an Old World genus of flowering plants in the family Apocynaceae. The English name periwinkle is shared with the related genus Catharanthus.

Vinca difformis

Intermediate periwinkle | Vinca difformis

Vinca difformis subsp. sardoa is a shrubby ground cover native to Sardinia that suits shady places. It flowers from May to September. Plant in partial to full shade on well-drained sandy or loamy soil and keep soil moist to well-drained. It is rated H4, meaning average hardiness for UK gardens.

Sardinian intermediate periwinkle (Vinca difformis subsp. sardoa) is a shade-tolerant ground cover that flowers from May to September and suits rock.

Vinca difformis subsp. sardoa

Sardinian intermediate periwinkle | Vinca difformis subsp. sardoa

Vinca minor 'Bowles's Variety' is a trailing, evergreen subshrub prized for forming a low, spreading mat by rooting along its stems. Its glossy, leathery leaves remain through winter and its solitary, five-lobed flowers appear from May to September. The plant commonly roots at nodes to create large clonal colonies and can occasionally scramble to about 40 centimetres high. It does not twine or climb.

Vinca minor 'Bowles's Variety' is a trailing evergreen periwinkle with glossy leaves and violet-purple flowers that bloom from May to September.

Vinca minor 'Bowles's Variety'

Common Periwinkle | Vinca minor 'Bowles's Variety'

Vinca minor 'Gertrude Jekyll' is a trailing subshrub in the Apocynaceae that spreads by rooting along its stems to form mats. It bears glossy, dark green leaves and produces solitary violet-purple flowers in the leaf axils. Flowering occurs from May to September.

Vinca minor 'Gertrude Jekyll' is a trailing periwinkle with glossy dark green leaves and violet-purple flowers from May to September.