Results 171 to 180 of about 660 (188)

Historical Perspectives on Heterostyly

1992
Heterostyly was recognized as a morphological feature of certain groups of flowering plants as early as the 16th century, when it was reputedly noted in Primula by Clusius (van Dijk 1943). Few, if any, attempts were made to interpret the adaptive significance of this floral heteromorphism until Charles Darwin and Friedrich Hildebrand studied the ...
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Heterostyly inOldenlandia scopulorum bull.

Journal of Genetics, 1966
Heterodistyly inOldenlandia scopulorum Bull., a member of the Rubiaceae, is described. The species is characterised by two floral forms, the pin with long style and short anthers and thrum with short style and long anthers. Further the pin has small pollen grains and long stigmatic papillae while the thrum has large pollen grains and short stingmatic ...
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Heterostyly inHedyotis nigricans (Lam.) Fosb

Journal of Genetics, 1970
Heterostyly inHedyotis nigricans (Lam,) Fosb., a species of the family Rubiaceae is described with measurements of style, anther height, pollen grain diameters and stigmatic papillae. Results of pollination experiments in various crosses are reported. Thrum is more completely self-incompatible than Pin and the cross Pin X Thrum is more fertile than the
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The evolution and adaptive significance of heterostyly

Trends in Ecology & Evolution, 1990
The origin and adaptive significance of heterostylous breeding systems have fascinated evolutionary biologists since Darwin's early work on the subject. Models of the evolution of heterostyly differ in the emphasis given to different selective forces and in the sequence in which the physiological and morphological components of the polymorphism are ...
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HETEROSTYLY IN LITHOSPERMUM COBRENSE (BORAGINACEAE)

American Journal of Botany, 1979
Lithospermum cobrense Greene exhibits the floral dimorphisms and strong self‐incompatibility system typical of most distylous plants. Flowers of the long styled (pin) form produce smaller pollen grains but more pollen per flower than flowers of the short styled (thrum) form. Corollas of pins and thrums are equal in size.
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Homostyly and heterostyly inOldenlandia umbellata L

Journal of Genetics, 1970
Homostyly in heterostyledOldenlandia umbellata L., a species of the family Rubiaeeae is described. Homestyles are of the short styled type. Measurements of homostyles are compared with the heterostyles. On the basis of self fertility the homostyles are named fertile and infertile.
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Heterostyly and homostyly inPentas lanceolata (Forsk.) Delf

Journal of Genetics, 1970
Heterodistyly inPentas lanceolat a (Forsk.) Delf., a species of the family Rubiaceae is described with measurements of style, anther, pollen grains and stigma papilla sizes. Homostyles with stamens and stigma at the same level in the same species is also reported.
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The primrose path to heterostyly

New Phytologist, 2006
Austin R, Mast, Elena, Conti
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The dimorphic heterostyly inAconogonon campanulatum (Polygonaceae)

Plant Systematics and Evolution, 1991
Heterostyly is clearly confirmed inAconogonon campanulatum. This distylous species is dimorphic for tepals, styles, stigma surface, stamens, pollen grain size, and pollen sexine ornamentation. The floral shape is campanulate and thrum flowers are slightly larger than pin flowers.
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Heterostyly inPolygonum chinense L.

Journal of Genetics, 1977
N. Pratap Reddy, Bir Bahadur, P. Vijay Kumar   +2 more
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