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Clerodendrum trichotomum (harlequin glorybower, glorytree, peanut butter tree) is a species of flowering plant in the genus Clerodendrum. It is placed in the family Lamiaceae, or sometimes the Verbenaceae. It is native to China, Korea, Taiwan, Japan, and India.
It is a large shrub, growing 3–6 metres (10–20 ft) high. The leaves are ovate, up to 12 cm (5 in) long, soft and downy or hairy, producing a peanut odor when crushed. The fragrant flowers are borne on branching peduncles. They have white petals, held within a green calyx which turns red as the fruits ripen. The fruits (drupes) are white, changing to bright blue and eventually dark blue on maturity. They contain the novel blue pigment Trichotomine.
It is cultivated for its fragrant flowers, autumn colour, and ornamental berries. It is hardy but requires a sheltered position. The variety C. trichotomum var. fargesii (Farges' harlequin glorybower) has gained the Royal Horticultural Society's Award of Garden Merit. (confirmed 2017).
- "Clerodendrum trichotomum". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA). Retrieved 23 January 2018.
- RHS A-Z Encyclopedia of Garden Plants. United Kingdom: Dorling Kindersley. 2008. p. 1136. ISBN 1405332964.
- Iwadare S, Shizuri Y, Yamada K, Hirata Y. Synthesis of trichotomine, a blue pigment obtained from clerodendron trichotomum thunb. Tetrahedron. 1978; 34(10):1457-1459. doi:10.1016/0040-4020(78)80166-5
- Clerodendrum trichotomum var. fargesii. Royal Horticultural Society.
- "AGM Plants - Ornamental" (PDF). Royal Horticultural Society. July 2017. p. 22. Retrieved 24 January 2018.
- Gledhill, David (2008). "The Names of Plants". Cambridge University Press. ISBN 9780521866453 (hardback), ISBN 9780521685535 (paperback). p 111, 385
- Hillier, J. and A. J. Coombes. The Hillier Manual of Trees and Shrubs. David & Charles. 2007.
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