Ceratostigma Explained

Ceratostigma (;^[1]), or leadwort, plumbago, is a genus of eight species of flowering plants in the family Plumbaginaceae, native to warm temperate to tropical regions of Africa and Asia. Common names are shared with the genus Plumbago.

Description

Ceratostigma species are flowering herbaceous plants, subshrubs, or small shrubs growing to 0.3- tall. The leaves are spirally arranged, simple, 1–9 cm long, usually with a hairy margin. Some of the species are evergreen, others deciduous. The flowers are produced in a compact inflorescence, each flower with a five-lobed corolla; flower colour varies from pale to dark blue to red-purple. The fruit is a small bristly capsule containing a single seed.

Species

Seven species are accepted.

• Ceratostigma abyssinicum (Hochst.) Schwein. & Asch.
• Ceratostigma asperrimum
• Ceratostigma griffithii C.B.Clarke
• Ceratostigma minus Stapf ex Prain
• Ceratostigma plumbaginoides (Bunge)
• Ceratostigma ulicinum Prain
• Ceratostigma willmottianum Stapf

Cultivation and uses

Plants of this genus are valued in the garden for their late summer flower colour and their autumn leaf colour. The following varieties have gained the Royal Horticultural Society's Award of Garden Merit (confirmed 2017):^[2]

• C. plumbaginoides^[3]
• C. willmottianum^[4]
• C. willmottianum ='Lice'^[5]

References

Sources

• Flora of China: Ceratostigma
• Huxley, A., ed. (1992). New RHS Dictionary of Gardening. Macmillan.

Notes and References

1. Sunset Western Garden Book, 1995:606–607
2. Web site: AGM Plants - Ornamental . July 2017 . 17 . Royal Horticultural Society . 24 January 2018.
3. Web site: RHS Plant Selector - Ceratostigma plumbaginoides. 5 July 2020.
4. Web site: RHS Plant Selector - Ceratostigma willmottianum. 5 July 2020.
5. Web site: RHS Plant Selector - Ceratostigma willmottianum 'Forest Blue'. 5 July 2020.