Introduction to the Principles of Plant Taxonomy by V. V. Sivarajan

By V. V. Sivarajan

Even supposing one of many earliest of organic disciplines, plant taxonomy continues to be an enormous and suitable point of contemporary botany. A disproportionate emphasis at the perform of plant taxonomy has to some degree triggered the technological know-how to be visible completely because the job of plant identity. This booklet makes an attempt to redress the stability via delivering an creation to the taxonomic conception upon which the identity approach is predicated. the second one version has been thoroughly revised and up to date by means of the writer and edited via Norman Robson to mirror the fast advances that have happened in plant taxonomy because e-book of the 1st variation.

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Companion cells also occur in gnetophytes, but apparently again through a different developmental pathway. 6. Carpels. Angiosperms have ovules enclosed in carpels, whereas gymnosperms have exposed ovules (hence the name). However, the nature of the carpel varies widely and is not completely enclosing in some cases. The origin and ancestry of the flowering plants remains a mystery. No clear ancestral lineage has been identified beyond the complex of Mesozoic seed plants clearly recognizable as flowering plants from which all of the major lineages branched.

The megasporocyte divides meiotically to produce four haploid megaspores. Three of these degenerate leaving one megaspore, which divides mitotically many times to produce a megagametophyte. Specialized regions of the megagametophyte will differentiate into two archegonia, and each of these archegonia will produce a single egg cell. Development of the megagametophyte occurs inside the megaspore (all inside the megasporangium and the integument). The pollen is carried by wind or insects to a mucilaginous droplet, which exudes from the micropyles of the ovules.

The origin and ancestry of the flowering plants remains a mystery. No clear ancestral lineage has been identified beyond the complex of Mesozoic seed plants clearly recognizable as flowering plants from which all of the major lineages branched. , 1987). It has been suggested that the earlier angiosperms lived in upland, possibly arid, regions where they were unlikely to enter the fossil record (Cleal, 1989). The lack of any trace (including pollen, which can be widely transported) of these pre-Cretaceous angiosperms through the Carboniferous to Cretaceous time gap makes this hypothesis unlikely.

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