Pertti Uotila

Lectotypifications in Elatine (Elatinaceae) and Some Taxonomic Remarks

Elatine orthosperma Düben, E. spathulata Gorski, Elatine hydropiper L. subsp. gyrosperma Fr. and E. triandra Schkuhr var. callitrichoides Nyl. are lectotypified, and an epitype is selected for the lectotype of E. spathulata. The synonymizing of E. spathulata with E. hydropiper is supported. — Flora Nordica Notes 36.

Dysphania sect. Botryoides (Amaranthaceae s. lat.) in Asia

Abstract Uotila P.: Dysphania sect. Botryoides (Amaranthaceae s.lat.) in Asia. — Willdenowia 43: 65–80. June 2013. — Online ISSN 1868-6397;

The nomenclature of Portulaca oleracea and P. sativa (Portulacaceae)

Abstract Uotila P., Sennikov A. N. & Danin A.: The nomenclature of Portulaca oleracea and P. sativa (Portulacaceae). — Willdenowia 42: 25–28. June 2012. — Online ISSN 1868-6397;

Notes on the morphology and taxonomy of Chenopodiastrum (Chenopodiaceae/Amaranthaceae s. lato), with two new combinations, C. erosum from Australia and C. gracilispicum from China

An emended description of Chenopodiastrum S. Fuentes, Uotila & Borsch, a small segregate genus of the heterogeneous Linnaean genus Chenopodium, is provided and morphological characters used in the generic description are evaluated. Two species are transferred from Chenopodium to Chenopodiastrum for which two new combinations, Chenopodiastrum erosum (R. Br.) Uotila and C. gracilispicum (H.W. Kung) Uotila, are made. The descriptions of these species are emended and their relationships within the genus discussed.

Taxonomic Circumscription and Synonymy of Chenopodium karoi and C. acerifolium (Chenopodiaceae)

Chenopodium acerifolium Andrz. and C. karoi (Murr) Aellen have often been confused with each other and with similar taxa occurring in the northernmost parts of Russia. In particular their relationships with C. prostratum Bunge ex Herder nom. illeg. and C. jenissejense Aellen & Iljin have not been clear. The type material of C. jenissejense is heterogeneous and here we designate the lectotype for it so that C. jenissejense will be probably conspecific with C. prostratum, for which the lectotype is also designated here. We provisionally consider C. jenissejense, a Siberian riverside plant, to be conspecific with the mainly Central Asian C. karoi, but further studies are needed to confirm their relationships. Emended morphological descriptions are given of C. acerifolium and C. karoi and their types are discussed. Paul Aellens role in the taxonomic treatment of C. karoi s. lato and in preparing the account of Chenopodium for the Flora of the USSR is clarified based on the correspondence between Aellen and M.M. Iljin.

Sagittaria × lunata, a Binomial for the Widespread North European Hybrid between S. natans and S. sagittifolia (Alismataceae)

The hybrid between the aquatic plants Sagittaria natans, of boreal Eurasia, and S. sagittifolia, of temperate Europe and W Asia, is widespread in the area of N Europe (Sweden, Finland, Russia) where the ranges of the two species overlap. The hybrid, which is variously intermediate between its parents, is described as S. × lunata C.D. Preston & Uotila. Its known distribution is mapped and its habitat, reproduction and dispersal are summarised. In Norden (= Fennoscandia and Denmark) it occurs in many watercourses in the absence of one or both parents, suggesting that it has a relict distribution, and it extends further north than S. sagittifolia and further north and south than S. natans. In the Finnish provinces at the northern end of the Gulf of Bothnia there is a hybrid complex which includes plants which approach S. sagittifolia, but only a single specimen of typical S. sagittifolia is known from these regions. S. sagittifolia forma xanthandra Holmberg, described from Sweden, appears to have been a non-persistent variant of S. sagittifolia with yellow anthers rather than a hybrid with S. natans. — Flora Nordica Notes 34.