Clerodendrum is a genus of flowering plants in the Lamiaceae family. It is a member of the subfamily Ajugoideae, one of four subfamilies transferred from Verbenaceae to Lamiaceae based on morphological and molecular phylogenetics.
Clerodendrum L. is
widely distributed in the tropical and subtropical regions of the world,
with more the 500 species identified, with ethnomedical use in many
indigenous systems (Indian, Korean, Japanese, Thai, Chinese) for a variety
of disease: syphilis, typhoid, cancer, jaundice and hypertension.
Pelegrina is an erect, branched, somewhat hairy shrub,
1 to 2 meters in height. Leaves are broadly ovate, up to 25 centimeters long,
pointed at the tip and blunt at the base. The inflorescences (cymes)
are short-stalked and terminal, 6 to 12 centimeters in diameter, densely crowded
with flowers. Flowers are fragrant, in stalks 1 to 2 centimeters long. The
calyx-tube is rather slender below and enlarged above, with five to
six lanceolate lobes which are reddish-purple and about 1.5 centimeters long.
Corolla is white, 3 to 3.5 centimeters in diameter and 1 to 1.5 centimeters long in the
- Cultivated in and
near towns throughout the Philippines.
- Occasionally, an escape plant.
- Native of southeastern Asia, from southern China and northern Vietnam.
- Now pantropic.
- Yields (24S)-ethylcholestra-5, 22,25-triene-3ß-ol.
- Petroleum ether extracts yielded steroids - clerosterol and deucosterol.
- Yields phenolic compounds acetoside, leucosceptoside A, isoacteoside, methyl and ethyl esters of caffeic acid, jinoside.
- Leaves yield flavonoids, kaempferol.
- Aerial parts yielded a new iridoid diglucoside, 5-O-ß-glycopyranosyl-harpagide with three known iridoid glucosides and six known cyclohexylethanoids.
- Study isolated two minor sterols: 24β-methylcholesta-5,22E,25-trien-3β-ol and 24α-ethyl-5α-cholest-22E-en-3β-ol. (8)
- Study of leaves for volatile oils by GC-MS analysis yielded 31 compounds. Five main compounds were 1-octen-3-ol (49.50%), (E)-3-hexen-1-ol(13.39%), linalool (9.41%), cyclohexanol (3.37%), 3-octanol (1.69%), n-valeridc acid-cis-3-hexenyl ester (1.42%), 1-hexanol (1.38%),furfural (1.37%) and α-terpineol (1.17%),accounting for 81.53% of the total volatile oils. (15)
- Fractions of a methanol extract of air-dried leaves yielded
verbascoside, isoverbascoside, decaffeoylverbascoside, hispidulin, lupeol and icariside B5, together with cornoside and rengyolne. (see study below) (16)
- The Malays use the plant externally as a poultice, for rheumatism and ague; or
mixed with other substances, for skin ailments.
- In the Guianas, decoction of leaves used for scabies.
- In Thailand and Malaysia, leaves used for rheumatism.
- Roots and leaves used for asthma, rheumatism, and inflammatory conditions.
- In Surinam, leaf decoction used for scabies.
• Phytochemicals: Study yielded beta-sitosterol, clerosterol, daucosterol, caffeic acid,
kaempferol, 5,4'-dihydroxy-kaempferol-7-O-beta-rutinoside, acteoside
and leucoseceptoside A. (1)
• Anti-Leukemic: Study showed promyelocytic cell line HL-60 could be induced to differentiate into morphologically and functionally mature monocytoid cells (up to 20%) after dose-dependent exposure to Clerodendron fragrans working in synergism with interferon-r. Results suggest a potential therapeutic value for the treatment of certain acute myelocytic leukemia. (3)
• Anti-Inflammatory / Leaves: Study evaluated an aqueous extract of leaves for anti-inflammatory activity using carrageenan, formaldehyde, histamine and egg white induced rat paw edema and cotton pellet-induced granuloma models in rats. Results showed pronounced anti-inflammatory activity at doses investigated. (4)
• Antibacterial Potential / Leaves: Study evaluating crude ethanolic leaves extracts for antibacterial activity showed effective growth inhibition of E. coli, S. aureus, and Klebsiella. (10)
• Silver Nanoparticles / Mosquitocidal / Leaves: Study reports on the eco-friendly biosynthesis of silver nanoparticles using a leaf extract of C. chinense. It showed potential against larval populations of mosquito vectors, with negligible toxicity against non-target aquatic organisms. (14)
• Analgesic / Anti-Inflammatory / Antipyretic / Leaves: Methanol extract of leaves of C. chinense and verbacoside showed significant analgesic, anti-inflammatory and antipyretic effects. (see constituents above) (15)