The life history and genetic system of Leucopogon juniperinus

  title={The life history and genetic system of Leucopogon juniperinus},
  author={S Smith-white},
Leucopogon juniperinus R. Br. has a wide but apparently discontinuous distribution in the coastal and tableland regions of eastern Australia. It extends over a latitudinal range of nearly iooo miles, from Gympie (Queensland) to Gippsland, and is found at altitudes from sea level to 4000 feet. Throughout this range, the species shows a high degree of uniformity in morphological characters, and it is apparent that this uniformity has a cytological basis. 
A new, rare species of Melicytus (Violaceae) from New Zealand
A new species of Melicytus, M. drucei, is described and illustrated, believed to be a stable triploid hybrid between these two M. alpinus complex.
Cytoevolution, Phylogeny and Taxonomy in Epacridaceae
Abstract Chromosome numbers in Epacridaceae were collated from various authors and superimposed on to recent cladograms for the family. The results strongly indicate that reduction in chromosome
Natural Pentaploids in the Opuntia lindheimeri-phaeacantha Group in Texas
Pentaploidy in Opuntia can be added to the relatively few recorded cases of naturally occurring pentaploids in nonagamospermous angiosperms.
The accepted arrangement of the genera of Epacridaceae rests solely on ovary and fruit characters, and it is indicated that the family includes four major groups, only one of which (the tribe Styphelieae) is recognized in the present system.
Hybridisation in a wild population of eleocharis palustris
Twenty-nine inflorescences from plants of Eleocharis palustris in a small area of Port Meadow, Oxford, were found to include four types, one of which was abnormal showing delayed or non-disjunction of the chromosomes at PGM I in approximately 8% of the cells.
Index of chromosome numbers of indigenous New Zealand spermatophytes
Abstract An index of chromosome numbers for spermatophytes indigenous to the New Zealand Botanical Region is presented, along with full references to the original reports. Chromosome numbers are
Pollen structure of the New Zealand members of the Styphelieae (Epacridaceae)
The development of the unusual functional monad type of pollen in the Styphelieae may be related to fruit type.
Remarks on karyological differentiation patterns in tropical woody plants
Karyomorphology suggests a new systematic arrangement for the Laurales, a new circumscription of theCymbopetalum tribe (Annonaceae), and a placement of theCochlospermaceae/Bixaceae in theViolales.
Hybridization and evolution inCardamine (Brassicaceae) at Urnerboden, Central Switzerland: Biosystematic and molecular evidence
The evolution at Urnerboden is discussed in the context of the traditional concept of multiple plant origins: site management seems to be very important to a further development of hybridogenous populations and their parent species.
Disturbance, hybridization and hybrid speciation
The evolutionary forces which operate within a given plant population both produce and sort out genetic variation which proceeds from the molecular level of mutation to the adaptation of individuals in populations.


Polarised segregation in the pollen mother cells of a stable triploid
A triploid species of Leucopogon was discovered in which chromosome behaviour at meiosis is peculiar and of general cytological interest, and the results of such a survey are being published elsewhere.
Embryo-Sac Formation in Diploid and Polyploid Species of Roseae
A general account of the processes of embryo-sac formation in Roseae is published, since the research covers new ground and the author has been carrying out cytogenetical experiments with the numerous species of the Tribe Roseae.
Chromosome Studies in Cyperaceae, VI:Pollen development and additional evidence for the compound chromosome in Scirpus lacustris L
The present material, Scirpus lacustris L., was first investigated by Piech (1924a) on the pollen development, later by Hakansson and Kostrionkoff on the chromosome number and recently by the writer on the special chromosome conditions in three types, i.e. normal self-colored, and the other twos variegated.
Chromosome Studies in Cyperaceae, XII:Pollen Development in Five Genera, with Special Reference to Rhyncospora
A new type of pollen development in Rh yneospora and other normal types seen in Bulbostylis, Scleria, Cyperus and Kyllingia will be dealt with.