Genus Medicago (Leguminosae): A Taxogenetic Study by Karlis Adolfs Lesins, Irma Lesins (auth.)

By Karlis Adolfs Lesins, Irma Lesins (auth.)

In introducing ourselves it may be informed that during our local Latvian language our identify is written LesiJ;l. s. In so much English courses, as during this paintings, the writing has been simplified to Lesins, and infrequently simply the 1st preliminary has been used. Our curiosity in Medicago used to be first aroused in the course of 1936-38, whereas em­ ployed as academics within the agricultural and residential economics institution at Be­ brene, top Zemgale, Latvia. a few vegetation of alfalfa (M. varia, M. media), in the community referred to as 'lucema', have been stumbled on starting to be wild alongside roadsides in that sector, although no alfalfa fields were noticeable within the region in the me­ mory of neighborhood farmers. a few roadside vegetation have been dug out and transplanted to the backyard, yet their seedset used to be bad. throughout the following few years we paid in simple terms moderate cognizance to alfalfa, the reason is that Latvia is a rustic with Atlantic climatic positive factors (annual precipitation 600-700 mm; light win­ ters for its 56°-58° N. Lat. , with January isotherms among -3° and -7° C; reasonably hot summers, with July isotherms among sixteen° and 18° C), which including its soils, typically of acidic, podzolic sort, isn't really good­ fitted to alfalfa creation. It was once now not till 1945 in Sweden that paintings on alfalfa got here to the foreground, while the senbor writer was once assigned investi­ gations on alfalfa seed atmosphere by way of Dr. Erik Akerberg, then director of the Swedish Seed organization department station at ffituna.

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Extra info for Genus Medicago (Leguminosae): A Taxogenetic Study

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The goats devour not only green shoots but search out ripe Medicago pods fallen on the ground. Perennial Medicago, too, are endangered by overgrazing, as they cannot mature seeds. We sought in vain for some plants with pods of the N. African M. sativa-related taxa (M. sativa ssp. tunetana, ssp. faurei, and (. gaetula). All we could find in their growing sites were some short-bitten prostrate stems. Deprived of the possibility to ripen seeds and weakened by continuous defoliation, such plants eventually succumb to diseases.

Murex (Lesins & Gillies, 1972). No 2n = 16 types in the mentioned four 2n = 14 species are found, nor are any tetraploid, 2n = 28, forms known. All of them together with M. murex are annuals, three of which (M. rigidula, M. constricta, M. murex) belong to section Pachyspirae and two (M. praecox, M. polymorpha) to section Leptospirae. No close relationship seems to exist between these two sections that would suggest a common origin. There are two annual tetraploid, 2n = 32, species (M. rugosa and M.

This appears to be a close parallel with evolution of annual Medicago. Hagerup (1951) furhter reports conditions on the Faroe Islands, where pollinating insects are scarce because of the cold, rainy climate, and plants have likewise turned to self-pollination, while on the continent the same species are pollinated by insects, especially by bees. It seems reasonable to assume that these changes in Medicago, resulting in annual self-pollinators, have taken place in the Mediterranean basin during its desiccation period lasting about one and a half million years.

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