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March 1977
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21 Reads
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4 Citations
Plant Systematics and Evolution
Population analyses, scatter diagrams and field observations demonstrate thatOphrys helenae is morphologically (and ecologically) well separated from the partly sympatricO. mammosa andO. ferrumequinum in N. Greece. Hybrids with the distantly relatedO. mammosa are very rare.
June 1975
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31 Reads
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35 Citations
Plant Systematics and Evolution
Flower polymorphism in 15 ItalianOphrys populations (N = 282) was analysed in detail. Statistical and graphical evaluation of data demonstrates morphological relationships and amount of hybrid character coherence.O. bertolonii s. str. andO. atrata are stable parental taxa, but occasionally form hybrids and hybrid swarms. Much evidence suggests that it was through such homogamic hybridization, involving these and other species ofOphrys, that the stabilized taxaO. bertoloniiformis andO. promontorii (ecologically different, but sympatric with the parents on Gargano), andO. benacensis (geographically separated from the parents in the Insubric region) originated. These differentiation-hybridization cycles are linked to the break-down and new establishment of incomplete prezygotic crossing barriers (e.g. different flower biology, flowering time, habitat preference).
3 Reads
3 Reads
... Thiele & Thiele 2001;Ellenbast 2013, etc.). On the other hand, Danesch & Danesch (1977) (Moore 1980;Kühn & al. 2019;POWO 2024). Other authors treat O. helenae as a distinct species of the O. sphegodes group (Paulus & Hirth 2017;Löki & al. 2020;Strid 2024), or O. mammosa group (Delforge 2016). ...
March 1977
Plant Systematics and Evolution
... Despite the documented close plant-pollinator relationship in this group, however, there is evidence that some of these species hybridize with each other, especially closely related or sympatric species. Despite the selective attraction of pollinators, nonlegitimate pollination does occur, and hybrids can sometimes be found ( Stebbins and Ferlan, 1956 ;Danesch and Danesch, 1972 ;Danesch et al., 1975 ;Ehrendorfer, 1980 ). Several hybrids have been described for Ophrys (see Pedersen and Faurholdt, 2007 ) and for several species, a hybridogenic origin has been proposed ( Paulus and Gack, 1990a ;Paulus and Gack, 1999 ;Devey et al., 2008 ) concurrently with the description of a great number of newly named species ( Delforge, 2001 ;Tyteca et al., 2003 ;Kreutz et al., 2007 ;Lowe, 2010 ;Lowe, 2011 ). Orchids off er a unique system for studying evolution, improving and integrating our knowledge of plant-pollinator interactions, and testing their eff ects upon diversifi cation. ...
June 1975
Plant Systematics and Evolution
