The life span of some species of the genus Scutellaria L., Lamiaceae
Maria NEBAYKINA
Botanical Garden-Institute FEB RAS, Vladivostok, Russia
The genus Scutellaria L. is the most detached among the members of the family
Lamiaceae. One of the most distinctive features of this the genus is the absence
of ether-oil. Of the more than 300 species distributed in temperate regions (except
South Africa) and the highlands of the tropics, some are medicinal, melliferous
or decorative. The life cycle for the herbaceous plants, including a species of
Scutellaria, depends on the life span of their underground systems. The article
deals with two groups of species: perennials and one- biannual. A similar study for
the species of Scutellaria is undertaken for the first time.The first group includes
species that live more than 50 years (S. baicalensis Georgi, S. creticola Juz.,
etc.). The underground system is represented by many-headed caudex with
taproot. The above-ground system is represented by elongated shoots. Species
included in this group often flower and fruit during the their ontogeny. The species
of the second group for the entire life cycle of flower and fruit only once. The
second group consists of species with a life span in 1-2 years (S. strigillisa Hemsl.,
S. tuminensis Nakai, S. ussuriensis (Regel) Kudo et al.) The underground system
is represented by long rhizomes with stolons. The collapse of loose clumps of
maternal individuals leads to vegetative reproduction and restoration with rapid
capture of territory and the weakening of the competitive relationship. Seed
reproduction in some years is absent. The above-ground system is similar to the
first group of species.
© 2012 Organizing Committee
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