Abstract
Worldwide, 10 genera and 400 species comprise the Hypericaceae, the St. Johnswort Family. The genus Hypericum, with 350 of these species (11), includes evergreen or deciduous shrubs, subshrubs, and herbaceous perennials. The hypericums have simple, opposite or whorled leaves and usually golden-yellow many-stamened flowers.Common St. Johnswort (Hypericum perforatum L.) is a hairless perennial, reproducing by seeds and by runners from the base of the stem. It grows 20 to 100 cm tall, with spreading branches and small deep green glabrous oblong-ovate leaves, perforated by many translucent glandular dots. Branched clusters of golden yellow flowers with tiny black spots are produced from May to August (14).
Publisher
Cambridge University Press (CUP)
Subject
Plant Science,Agronomy and Crop Science
Reference18 articles.
1. Biological control of St. John's Wort, Hypericum perforatum (Clusiaceae), in South Africa
2. Marsh C. D. and Clawson A. B. 1930. Toxic effect of St. Johnswort (Hypericum perforatum) on cattle and sheep. U.S. Dep. Agric., Tech. Bull. 202.
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