Amsonia consists of perennial plants that grow in clumps and produce a milky sap. They feature elongated, lanceolate leaves and bear clusters of small, star-like blue blooms at the tips during the spring and summer months.

Amsonia orientalis 'Cally Dark Stem'

Amsonia orientalis is a herbaceous perennial that develops a compact mound of upright stems. Its leaves are a muted blue-green hue, transitioning to yellow as autumn arrives. The flower buds exhibit a steely-blue color, eventually unfolding into clusters of blue, five-petaled star-like blooms that persist through late summer. This variant is somewhat shorter than the typical species, growing to about 50 cm, and it forms dense clumps more rapidly.

Amsonia orientalis from Turkey

Amsonia palmeri

Amsonia peeblesii

Amsonia rigida

Amsonia tabernaemontana is a perennial that develops into a compact clump, featuring numerous stems adorned with small, elongated, dark green leaves. From late spring through mid-summer, it produces dense clusters of soft blue flowers.

Amsonia tabernaemontana

Amsonia tabernaemontana 'Montana'

Amsonia tabernaemontana 'Short Stack'

Amsonia tabernaemontana 'Stella Azul'

Amsonia tabernaemontana 'Storm Cloud' is a herbaceous perennial that develops a dense clump of upright stems with a deep coloration. Its foliage consists of subtly blue-green leaves that transform to yellow as autumn approaches. In late spring to early summer, the steely-blue flower buds emerge and open into clusters of five-petaled blue flowers.

Amsonia tabernaemontana 'Storm Cloud'

Amsonia tabernaemontana galacticifolia

This perennial grows in clumps, reaching a height of up to 60 cm. It features narrow, dark green leaves resembling those of willows. From late spring through midsummer, it produces loose clusters of star-shaped flowers in a pale blue hue.

Amsonia tabernaemontana var. salicifolia

Amsonia tharpii

Amsonia tomentosa

Amsonia tomentosa var. stenophylla

Anisotoma natalensis

Apocynum

Apocynum androsaemifolium, commonly known as spreading dogbane, is a perennial plant that typically reaches a height of around 75 cm. This species is indigenous to the wild regions of North America. It features pairs of oval, medium-green leaves that grow opposite each other along the stems. In summer, it produces small clusters of fragrant, bell-shaped flowers that are pale pink with darker pink stripes on the interior. After flowering, the plant develops elongated seed pods filled with silky-haired seeds.

This small genus comprises bushy, herbaceous perennials found in North America, temperate Asia, and southeastern Europe. They feature lanceolate or oval leaves and produce clusters of bell-shaped flowers that range in color from greenish-white to pink-purple, often emitting a pleasant fragrance.

Apocynum androsaemifolium

Apocynum pumilum

Apocynum venetum

Araujia consists of evergreen climbing shrubs characterized by their twisting stems rich in white latex. The leaves are simple and arranged in pairs, while the flowers are fragrant and salver-shaped, growing in umbels at the leaf axils. These flowers give way to large, inflated fruits that encase silky-tufted seeds.

Araujia

Araujia angustifolia

Araujia grandiflora

Araujia graveolens

Araujia hortorum

Araujia sericifera is a vigorous, climbing evergreen that twines as it grows. Its leaves are elongated, measuring around 10 cm in length. From late summer through autumn, it produces clusters of small, bell-shaped flowers that are either white or pale pink and emit a noticeable fragrance. The plant's sticky pollen clumps can ensnare visiting moths, which contributes to its common designation.

Araujia sericifera

Araujia sericifera variegata

Asclepias consists of either evergreen or deciduous perennials and subshrubs. They feature simple, entire leaves and bear clusters of small flowers that have a unique shape, arranged in an umbel formation. After flowering, they produce paired fruits that contain seeds enveloped in silky fibers.

Asclepias

Asclepias 'Alessa'

Asclepias 'Beatrix'PBR

Asclepias 'Beauty'

Asclepias 'Cinderella'

Asclepias 'Kiki'

Asclepias 'Red Wijna'

Asclepias albicans

Asclepias amplexicaulis

Asclepias angustfolia

Asclepias asperula

Asclepias asperula subsp. capricornu

Asclepias californica

Asclepias cordifolia

Asclepias cryptoceras

Asclepias curassavica is a vertical, evergreen sub-shrub characterized by its elongated leaves and terminal clusters of orange-red blooms measuring around 2 cm in diameter, which appear during the summer and fall. These flowers may give way to upright, oval-shaped fruit that can reach lengths of 6 to 8 cm.

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