Abstract
In this paper, species of the genus Adoxa L. were analyzed that occur in the flora of Russia. We noted that three species have been found on the territory of Russia: Adoxa moschatellina L., Adoxa orientalis Nepomn. and Adoxa insularis Nepomn. A. moschatellina has a circumpolar areal. The species A. orientalis rarely occurs in Far East. It was determined that this species has more primitive flower structure as compared with A. moschatellina. The lateral flowers of A. orientalis in the inflorescence are trimerous (Ca(3)CO(6)A6G(3)),, whereas anther filaments are integral. On islands Kunashir and Sakhalin, we noted the presence of A. insularis whose flower structure has signs of more complete organization. In A. insularis, petals are oval, with a pointed tip, and have straight veinlets; A. insularis possesses 3- to 4-fold fewer nectar glandules, which are located directly on the petals’ surface, rather than in depressions on the petals as in A. moschatellina. Anther filaments in A. insularis are longer, and the angle between cleft filaments in A. insularis is 30–40° (rather than 90° or more as in A. moschatellina). It was concluded that in Adoxa species, there has been an obvious process of evolutionary reduction of flower structure.
Highlights
For a long time, the Adoxaceae family has been regarded as monotypic and represented by one species, Adoxa moschatellina L. [1]
In 2002, we for the first time [6] found a small population of this species in the Gazimuro-Zavodsky District of Transbaikal Krai, in the basin of Budyumkan River, near stream Typkuraucha, in Tagaiskaya creek valley, 3 VI 2001
A. orientalis was collected near a natural spring at the bottom of a deep narrow creek valley that was bounded by high steep ridges
Summary
The Adoxaceae family has been regarded as monotypic and represented by one species, Adoxa moschatellina L. [1]. In Russia, this species inhabits conifer and mixed forests; alder, aspen, and willow thickets; fontinal banks; and sites near cliff piedmonts; in mountains, it reaches the Alpine belt. The ratio of segments of the apical flower is usually divisible by two and expressed by the formula Са(2)Cо(4)A4G(4).
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