ISSN 0003-3847
© Finnish Zoological and Botanical Publishing Board 2004

Contents of Volume 41 Number 3, 2004

Paal, J. & Trei, T. 2004: Vegetation of Estonian watercourses; the drainage basin of the southern coast of the Gulf of Finland. — Ann. Bot. Fennici 41: 157–177.
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Rodríguez-Riaño, T., Ortega-Olivencia, A. & Devesa, J. A. 2004: Reproductive biology in Cytisus multiflorus (Fabaceae). — Ann. Bot. Fennici 41: 179–188.
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Silvan, N., Tuittila, E.-S., Vasander, H. & Laine, J. 2004: Eriophorum vaginatum plays a major role in nutrient immobilisation in boreal peatlands. — Ann. Bot. Fennici 41: 189–199.
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Vervaeke, I., Wouters, J., Londers, E., Deroose, R. & De Proft, M. P. 2004: Morphology of artificial hybrids of Vriesea splendens x Tillandsia cyanea and V. splendens x Guzmania lingulata (Bromeliaceae). — Ann. Bot. Fennici 41: 201–208.
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Akan, H. & Aytaç, Z. 2004: Astragalus ovabaghensis (Fabaceae), a new species from Turkey. — Ann. Bot. Fennici 41: 209–212.
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Aytaç, Z. & Duman, H. 2004: Six new taxa (Caryophyllaceae) from Turkey. — Ann. Bot. Fennici 41: 213–221.
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Yin, J. T., Li, H. & Xu, Z. F. 2004: Colocasia menglaensis (Araceae), a new species from southern Yunnan, China. — Ann. Bot. Fennici 41: 223–226.
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Karaveliogullari, F. A., Duran, A. & Hamzaoglu, E. 2004: Verbascum tuna-ekimii (Scrophulariaceae), a new species from Turkey. — Ann. Bot. Fennici 41: 227–231.
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Nomenclatural novelties in Ann. Bot. Fennici 41(3). — Ann. Bot. Fennici 41: 232.
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Paal, J. & Trei, T. 2004: Vegetation of Estonian watercourses; the drainage basin of the southern coast of the Gulf of Finland. — Ann. Bot. Fennici 41: 157–177.

The general aims of the current study were (i) to develop a classification of the aquatic macrophyte communities of the Estonian watercourses flowing into the Gulf of Finland, (ii) to distinguish the main ecological variables which determine the occurrence of the dominating species and discriminate between the community types and, (iii) to establish a classification of river reaches (habitats) and to identify the parameters distinguishing them. The data were clustered into 23 vegetation types of which 18 were dominated by vascular plant species, while five clusters included communities of cryptogams. Water BOD5, current velocity and riverbed material proved to be the variables separating the clusters most reliably. The occurrence of single species is affected by different environmental variables; from this point of view the most important physical environmental variables are extent of bottom coverage with fine sediments and water turbidity; among the chemical variables content of O2, NH4-N and PO4-P, as well as N/P ratio are of considerable importance. As the species dominating in the clusters are mostly characterised by a very large geographical distribution and a wide ecological amplitude, the established community types are well known from other regions of Europe as well. However, comparison of the ecological parameters of the established community types with those obtained by other researchers revealed marked discrepancies in many cases. The river reaches clustered into four habitat types were significantly separated by water depth and turbidity as well as by riverbed substrate. In this way, in every habitat type there occur plant communities of different types; also, communities of a certain type can grow in different type habitats.

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Rodríguez-Riaño, T., Ortega-Olivencia, A. & Devesa, J. A. 2004: Reproductive biology in Cytisus multiflorus (Fabaceae). — Ann. Bot. Fennici 41: 179–188.

We studied the reproductive biology of two morphs (LF, large flowers; and SF, small flowers) of Cytisus multiflorus, an endemic legume from SW Europe. Visits by pollinators are indispensable for fruit-set to take place. After hand self-pollination, all the individuals have a uniform behaviour with null fruit, in spite of self-penetration of the ovules. This and the fact that the abscission of initiated fruit occurs en masse at the same time seems to indicate the possibility of a late-acting self-incompatibility in this species. Intramorph crosses showed that the SF morph has a significantly greater reproductive success than the LF morph. Intermorph crosses were quite ineffective due to the lesser viability of the LF morph pollen, although we cannot discard the possibility that its ovules are also less viable. The situation is suggestive of the presence of a partial reproductive barrier between the two morphs that operates both before and after crossing.

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Silvan, N., Tuittila, E.-S., Vasander, H. & Laine, J. 2004: Eriophorum vaginatum plays a major role in nutrient immobilisation in boreal peatlands. — Ann. Bot. Fennici 41: 189–199.

The temporal growth pattern, above- and below-ground biomass allocation of Eriophorum vaginatum (cottongrass) and its nutrient immobilisation dynamics were studied in a greenhouse experiment. The temporal growth pattern was also studied in a field experiment with three N and P addition levels in a restored peatland buffer in central Finland. The greatest seasonal increase in accumulated N and P occurred in roots and stems and leaf sheaths concurrently with the highest leaf elongation and new daughter tiller production. The amounts of N and P immobilised in cottongrass tissues were 73 g N m–2 (91% of the added N) and 13 g P m–2 (77% of the added P). A remarkable liberation of P into outflow water was observed at the end of the growing period. The annually increasing mass of dead organs of cottongrass, typically highly resistant to decomposition, forms a potential long-term sink for nutrients.

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Vervaeke, I., Wouters, J., Londers, E., Deroose, R. & De Proft, M. P. 2004: Morphology of artificial hybrids of Vriesea splendens x Tillandsia cyanea and V. splendens x Guzmania lingulata (Bromeliaceae). — Ann. Bot. Fennici 41: 201–208.

Intergeneric hybrids Vriesea splendens x Tillandsia cyanea and V. splendens x Guzmania lingulata within the subfamily Tillandsioideae of Bromeliaceae were studied. Multivariate analysis of flower morphology and leaf and bract color place the intergeneric hybrids in relation to their parents, although the bract color resembled more that of the paternal parent. Other characteristics such as petal color and offshoot formation were not intermediate. Important flower characteristics for bromeliad taxonomy such as stigma type, petal appendages and pollen are discussed in relation to their parents. Pollen of the intergeneric hybrids was completely sterile.

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Akan, H. & Aytaç, Z. 2004: Astragalus ovabaghensis (Fabaceae), a new species from Turkey. — Ann. Bot. Fennici 41: 209–212.

Astragalus ovabaghensis Akan & Aytaç sp. nova (Fabaceae) from Turkey is described and illustrated. It is closely related to A. erythrotaenius and tentatively placed in section Alopecuroidei.

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Aytaç, Z. & Duman, H. 2004: Six new taxa (Caryophyllaceae) from Turkey. — Ann. Bot. Fennici 41: 213–221.

Six new taxa are described and illustrated from Turkey as new to science: Arenaria yunus-emrei Aytaç & H. Duman, A. mcneillii Aytaç & H. Duman, Minuartia dianthifolia (Boiss.) Hand.-Mazz. subsp. elmalia Aytaç, Dianthus crinitus Sm. var. argaeus Aytaç & H. Duman, Bolanthus mevlanaea Aytaç, and Silene caramanica Boiss. & Heldr. var. ilarslani Aytaç & Dural. Their taxonomic positions are discussed and they are compared with the closely related taxa.

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Yin, J. T., Li, H. & Xu, Z. F. 2004: Colocasia menglaensis (Araceae), a new species from southern Yunnan, China. — Ann. Bot. Fennici 41: 223–226.

Colocasia menglaensis J.T. Yin, H. Li & Z.F. Xu is described and illustrated as a new species of Araceae from southern Yunnan, China. The morphological characters of C. menglaensis and the related C. lihengiae are compared. Colocasia menglaensis differs from C. lihengiae in its spadix with an appendix of 3.5 cm long, pubescent peduncle and petiole and the puberulous lower surface of the leaf blade.

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Karaveliogullari, F. A., Duran, A. & Hamzaoglu, E. 2004: Verbascum tuna-ekimii (Scrophulariaceae), a new species from Turkey. — Ann. Bot. Fennici 41: 227–231.

Verbascum tuna-ekimii Karaveliogullari, Duran & Hamzaoglu sp. nova (sect. Bothrosperma) is described from E Anatolia in Turkey. It is related to and compared with V. laetum, from which it mainly differs in its leaves, bracts, pedicels and capsules.

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