Tatiana A. Ostroumova

Towards a standardised terminology for taxonomically important morphological characters in the Umbelliferae

Taxonomically important structural characters and their states are given in an attempt to clarify and standardise the confusing and ambiguous terminology that is currently used in descriptions and identification keys of Umbelliferae taxa. The proposed terms to be used for characters and character states are listed, illustrated and discussed.

Critical taxonomic analysis of Dichoropetalum, Johrenia, Zeravschania and related genera of Umbelliferae-Apioideae-Peucedaneae

Abstract Pimenov, M. G., Kljuykov, E. V. & Ostroumova, T. A.: Critical taxonomic analysis of Dichoropetalum, Johrenia, Zeravschania and related genera of Umbelliferae-Apioideae-Peucedaneae. — Willdenowia 37: 465–502. — ISSN 0511-9618;

Towards a clarification in the taxonomy of Sino-Himalayan species of Selinum L. s. l. (Umbelliferae). The genus Oreocome Edgew.

Abstract Pimenov, M. G., Kljuykov, E. V. & Ostroumova, T. A.: Towards a clarification in the taxonomy of Sino-Himalayan species of Selinum L. s. l. (Umbelliferae). The genus Oreocome Edgew. — Willdenowia 31: 101–124. 2001. — ISSN 0511-9618. Oreocome, a genus of Himalayan Umbelliferae, which has not been accepted in the majority of regional floristic treatments and whose name was previously lectotypified with O. candollei, is re-defined with the help of carpological features. Oreocome is considered to comprise six species, distributed from Pakistan to SW China with a centre of diversity in the Himalayas, and it is delimited from both Selinum and Ligusticopsis. Three new species, viz. O. involucellata and O. depauperata from Nepal and O. hindukushensis from Pakistan, are described as new to science. Four new combinations, two in Oreocome (O. limprichtii, O. striata) and two in Ligusticopsis (L. coniifolia, L. wallichiana) are validated. Keys are provided to the accepted species of Oreocome and to the Himalayan species of Ligusticopsis.

Survey of the leaf anatomy of Araliaceae and some related taxa

Ostroumova, T.A. & Oskolski, A.A.: Survey of the leaf anatomy of Araliaceae and some related taxa. — Plant Div. Evol. 128: 423–441. 2010. — ISSN 1869-6155. Leaf blade structure of 32 species representing 20 genera of Araliaceae, Myodocarpaceae, and Apiaceae (subfamilies Mackinlayoideae and Azorelloideae) has been examined. Taxonomic and phylogenetic importance of leaf anatomical features were evaluated using both our original results and the data published by other authors. Such leaf anatomical characters as shape of bundle transection, presence of inverted bundles in midrib, presence of bundles in the centre of bundle ring, presence of the calcium oxalate crystals in mesophyll, thickness of periclinal outer walls of epidermal cells, stomatal type, number of epidermal cells surrounding stoma, presence and type of trichomes can be of certain systematic and phylogenetic value at least on the generic level. Some leaf characters can be used for delimitation of Myodocarpaceae, Mackinlayoideae, as well as of the large lineages within Araliaceae (i.e. the Aralia group, the Polyscias-Pseudopanax Group, the Cussonia group).

Reduction of Notopterygium to Hansenia (Umbelliferae)

Abstract Pimenov, M. G., Kljuykov, E. V. & Ostroumova, T. A.: Reduction of Notopterygium to Hansenia (Umbelliferae). — Willdenowia 38: 155–172. — ISSN 0511-9618;

Pseudoridolfia, nouveau genre d'Apiaceae découvert au Maroc

Abstract A morphological study of a new species of Apiaceae and a molecular systematic analysis based on ITS sequences has led to the description of the new genus Pseudoridolfia that is related to Foeniculum, Ridolfia and Anethum. The new species, P. fennanei, occurs in the Tetraclinis articulata formations of the semi—arid valleys located on the northern fringe of the Central Plateau of Morocco.