Botanicheskii zhurnal №11 / 2022 . 🔎 – P. 1055-1066 DOI: 10.31857/S0006813622110059 Citation database: Scopus 🔎 Heading: Сообщения 🔎 Authors: Остроумова Т. А. 🔎 Abstract: Проведен критический анализ применимости предложенных ранее разными авторами морфологических диагностических признаков для разграничения наиболее распространенных видов
Palimbia,
P. rediviva и
P. turgaica (число лучей терминального зонтика, угол между главным стеблем и ветвями, характер соцветия, порядок ветвления, длина плодоножек, ширина сегментов листа, число междоузлий на стебле). Изучены типовые образцы
Palimbia rediviva и
P. turgaica и коллекции обоих видов из гербариев LE, MHA и MW (всего 934 особи) методами одномерной и многомерной статистики. Показано, что указанные признаки имеют одновершинное распределение и не годятся для разграничивания видов, следовательно, название
P. turgaica следует считать синонимом
P. rediviva. Вместе с тем отмечена некоторая географическая дифференциация
Palimbia. В северной части ареала распространены растения, в соцветии которых имеются только ветви первого и второго порядка (синфлоресценцию в целом можно охарактеризовать как щитковидную), а соцветия с ветвями третьего порядка (в ключах для определения из называют раскидистыми метелками) практически отсутствуют. Западнее Волги почти не встречаются растения с ветвями только первого порядка. В Казахстане и Оренбургской области распространены все три варианта. Показаны корреляции на уровне 0.4–0.5 между признаками, которые предлагались в качестве диагностических.
Keywords: Apiaceae, систематика, морфология, изменчивость
Name in english: Morphological variability of Palimbia rediviva s.l., and status of P. turgaica (Apiaceae)
Abstract in english: To distinguish
Palimbia rediviva and
P. turgaica species, several authors (Lipsky in Woronov, 1931; Korovin, 1963; Pimenov, 1983; Ryabinina, Khyazev, 2009; Pimenov, Ostroumova, 2012; Pimenov, 2020) used the following traits: general appearance of inflorescence, number of rays in the terminal umbel, angle between the stem and branches of the first order, branching order, number of internodes on the stem from the rosette to the first branch, and the width of the leaf segments. Other authors considered
P. turgaica a synonym of
P. rediviva (Schischkin, 1950; Vinogradova, 2004; Yelenevskii et al., 2008). Type specimens of the both species (Table 1) and materials from LE, MHA, and MW herbaria were studied (totally 934 specimens). Inflorescence appearance is associated with the order of branching; plants can branch only to the first order (morphotype A), or to the second (morphotype B), or to the third (morphotype C), and occasionally there are individuals without branches or with branches of the fourth order (Fig. 1). It was shown that all the proposed diagnostic characters have a unimodal distribution and are not suitable for the species distinguishing (Fig. 3). At the same time, some geographical differentiation was noted. Morphotypes A and B predominate in the northern part of the range, while morphotypes B and C predominate in the western part, and all three forms are widely represented in Kazakhstan. The most significant correlations (Table 2) were noted between indicators of the total vigour of plants (total stem length, stem length below the first branch and in inflorescence, length of branches, number of internodes), and between the traits of synflorescence (branching order, number of internodes and length of the main stem in the inflorescence area, length of branches). For the branching order and the number of rays of the terminal umbel, a negative correlation of –0.4759 is shown. The tendency to reduction of the terminal umbel is also known in other Apiaceae (Reuther, Classen-Bockhoff, 2010; Kusnetzova, Timonin, 2017). The number of stem internodes from the rosette to the first branch is correlated not only with the length of this section, but also with the branching order, the number of umbel rays (negatively), and with the angle of origin of the lateral branches. The relationship of these traits has already been noticed by the compilers of keys for plant identification (Woronow, 1931; Korovin, 1963; Pimenov, 1983; Ryabinina, Knyazev, 2009), but in fact the correlation is not very high. It is interesting that the branching order is practically not correlated (0.092148) with the length of the stem below the first branch, but has a correlation of 0.49303 with the number of internodes in this section. When analyzing the principal components (Fig. 4, Tables 3, 4), the first component explains 46.98% of the variance, the second – 20.77%, in the amount of 67.7% (Table 3); thus, the projection of points onto the plane of the first and second components rather accurately reflects the position of dots in multidimensional space. The dots on the diagram form a continuous cloud; the studied individuals were not divided into isolated groups, although the areas of type specimens in multidimensional space do not overlap. ...
Keywords in English: Apiaceae, morphology, taxonomy, variability
Остроумова Т. А. Морфологическая изменчивость Palimbia rediviva s.l. и статус P. turgaica (Apiaceae) // Botanicheskii zhurnal — 2022. — №11. — P. 1055-1066.