| Article |
|---|
| Article name |
Morphological Features of Annuals in the Genera Strophiostoma and Trigonocaryum (Tribe Myosotideae, Boraginaceae) |
| Authors |
Nikiforova O.D. Doctor of Biology, Leading Researcher,, Nikiforovansk@yandex.ru |
| Bibliographic description |
Nikiforova O. D. Morphological Features of Annuals in the Genera Strophiostoma and Trigonocaryum (Tribe Myosotideae, Boraginaceae) // Scholarly Notes of Transbaikal State University. Series Biological sciences. 2017. Vol. 12, No. 1. PP. 80–87. |
| Section |
Botany |
| UDK |
582.948 |
| DOI |
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| Article type |
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| Annotation |
We discuss the morphological characteristics of annual species of the genera Strophiostoma Turcz.
and Trigonocaryum Tautv. from the tribe Myosotideae Reichenb. (family Boraginaceae Juss.). The most
fundamental tenets of the M.G Popov’s theory about hybrid origin of taxa of Boraginaceae family and
somatic reduction of the body are affirmed. Like in species of the genus Myosotis L., in annuals of
genera Strophiostoma and Trigonocaryum a decrease (reduction) of the size of the flower and its parts
(corolla, anthers), is seen and so does variability of characteristic “ cup pubescence “. Most hypertrophy
towards hooked hairs was found in annual species S. pseudopropinquum Popov and S. sparsiflorum
(Mikan ex Pohl) Turcz. in which the cup over the entire surface, especially at the base, is pubescent with
rough short half-hooked and single clinging hooked stiff hairs. Erem’s size of annual species in genera
Strophiostoma and Trigonocaryum is larger than those of their perennial relatives. In addition, in annuals
keel on the ventral side of the erem appears sharply, making its shape slightly triangular. Hypertrophic lobation of erems in annual species of these genera may serve as a basis for the assumption that the
ancestral elements of these taxa could be with expressed triangular or tetrahedral structure of the fruit.
At the annual species Strophiostoma sparsiflorum and Trigonocaryum involucratum (Stev.) Kusn.
structural features of the sprout system and inflorescence forms are registered. In contrast to the
perennial species they have leafy inflorescence, and weak, often decumbent stems, vegetative and
flowering offshoots from the axils of even the upper leaves are formed.
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| Key words |
annual species, genus Strophiostoma, genus Trigonocaryum, tribe Myosotideae,
family Boraginaceae, somatic reduction |
| Article information |
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| References |
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| Full article | Morphological Features of Annuals in the Genera Strophiostoma and Trigonocaryum (Tribe Myosotideae, Boraginaceae) |
