Hypericum hookerianum

Hypericum hookerianum
	Young flower
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Malpighiales
Family:	Hypericaceae
Genus:	Hypericum
Section:	H. sect. Ascyreia
Species:	H. hookerianum
Binomial name
	Hypericum hookerianum; Wight & Arnott

Hypericum hookerianum, or Hooker's St. John's Wort, is a perennial shrub native to eastern and southern Asia. The specific name hookerianum is named for William Jackson Hooker.[1]

Description

Hypericum hookerianum is a glabrous shrub that ranges from 6–8 ft (1.8–2.4 m) in height. Its moderately hard wood is closely grained.[2] The terete branches of the shrub are a reddish brown. Its obtuse leaves are either sessile or possess short stalks and taper to a point at their apex. The leaves range beneath from greyish-green to a rusty hue and are faintly translucent. The leaves are among the largest of the genus, measuring between 2–4 in (51–102 mm) long. The cymes of the shrub are have few flowers or are corymbose and possess bracts. The branches of the panicle are dichotomous or trichotomous and bear many opposite leaves that grow smaller as they approach the flowers. The deeply cupped flowers are golden yellow and measure 2 in (51 mm) wide. The petals are nearly obovate with denticulate margins and are longer than the stamens.[3] The stamens are numerous and are each united into five bundles. The small, spherical anthers are orange to yellow. The ovary is broadly ovate and tapers upwards, terminating into five styles that are recurved at their apex. The stigma is obtuse and downy. The calyx is composed of five large, lax, and obovate sepals. The sepals are united at their base and their membranous margins are denticulate.[4] It flowers in July.[5]

Distribution and ecology

Hypericum hookerianum can be found in southern India, the Himalayas, from north-western Thailand to Bangladesh, China, and California.[6][7]

The aphids Aulacorthum solani, Myzus ornatus, and Myzus persicae feed on the shrub.[8]

Uses

The extract of the leaf of Hypericum hookerianum is a strong antioxidant and can enhance spontaneous motor activity.[9][10]

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References

"Hypericum L. [Guttiferae-Hypericoideae]". Botanical Illustrations. Retrieved 2018-08-14.
Sir George Watt (1890). A Dictionary of the Economic Products of India: Gossypium to Linociera. A Dictionary of the Economic Products of India. 4. India Dept. of Revenue and Agriculture. p. 323.
Joseph Dalton Hooker (1875). The Flora of British India. 1 (Ranunculaceae to Sapindaceae ed.). L. Reeve and Co. p. 254.
Sir William Jackson Hooker; David Prain; Otto Stapf (1856). Curtis's Botanical Magazine. 3. 12. Reeve Brothers. p. 4949.
"Calflora: Hypericum hookerianum". Calflora. 2018. Retrieved 14 August 2018.
James Cullen; Sabina G. Knees; H. Suzanne Cubey; J. M. H. Shaw, eds. (2011). The European Garden Flora Flowering Plants: A Manual for the Identification of Plants Cultivated in Europe, Both Out-of-Doors and Under Glass. European Garden Flora. 2 (illustrated ed.). Cambridge University Press. p. 481. ISBN 9780521761512.
"Hypericum hookerianum Plant Profile". USDA Plants. U.S. Department of Agriculture, Natural Resources Conservation Service. Retrieved 14 August 2018.
R. L. Blackman; Victor F. Eastop (2008). Aphids on the World's Herbaceous Plants and Shrubs. John Wiley & Sons. p. 538. ISBN 9780470519592.
Raghu Chandrashekhar, H.; Venkatesh, P.; Ponnusankar, S.; Vijayan, P. (2009). "Antioxidant activity of Hypericum hookerianum Wight and Arn". Natural Product Research. Taylor & Francis. 23 (13): 1240–1251. doi:10.1080/14786410902885070. PMID 19731143.
Amritpal Singh Saroya; Jaswinder Singh (2018). Pharmacotherapeutic Potential of Natural Products in Neurological Disorders. Springer. p. 35. ISBN 9789811302893.

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[1] "Hypericum L. [Guttiferae-Hypericoideae]". Botanical Illustrations. Retrieved 2018-08-14.

[Dictionary-2] Sir George Watt (1890). A Dictionary of the Economic Products of India: Gossypium to Linociera. A Dictionary of the Economic Products of India. 4. India Dept. of Revenue and Agriculture. p. 323.

[Flora-3] Joseph Dalton Hooker (1875). The Flora of British India. 1 (Ranunculaceae to Sapindaceae ed.). L. Reeve and Co. p. 254.

[Curtis-4] Sir William Jackson Hooker; David Prain; Otto Stapf (1856). Curtis's Botanical Magazine. 3. 12. Reeve Brothers. p. 4949.

[5] "Calflora: Hypericum hookerianum". Calflora. 2018. Retrieved 14 August 2018.

[6] James Cullen; Sabina G. Knees; H. Suzanne Cubey; J. M. H. Shaw, eds. (2011). The European Garden Flora Flowering Plants: A Manual for the Identification of Plants Cultivated in Europe, Both Out-of-Doors and Under Glass. European Garden Flora. 2 (illustrated ed.). Cambridge University Press. p. 481. ISBN 9780521761512.

[7] "Hypericum hookerianum Plant Profile". USDA Plants. U.S. Department of Agriculture, Natural Resources Conservation Service. Retrieved 14 August 2018.

[8] R. L. Blackman; Victor F. Eastop (2008). Aphids on the World's Herbaceous Plants and Shrubs. John Wiley & Sons. p. 538. ISBN 9780470519592.

[9] Raghu Chandrashekhar, H.; Venkatesh, P.; Ponnusankar, S.; Vijayan, P. (2009). "Antioxidant activity of Hypericum hookerianum Wight and Arn". Natural Product Research. Taylor & Francis. 23 (13): 1240–1251. doi:10.1080/14786410902885070. PMID 19731143.

[10] Amritpal Singh Saroya; Jaswinder Singh (2018). Pharmacotherapeutic Potential of Natural Products in Neurological Disorders. Springer. p. 35. ISBN 9789811302893.