Plants and their ways in South Africa . before Sympetalae, and flowers with radial symmetrybefore zygomorphic ones. The less an organ is concerned with special habits, themore important it is for classification. Groups of higher rank Classification of Plants 201 are separated by differences in parts which alter little or plants immediate needs are met by its vegetative organs (root,stem, leaves). These change remarkably under varying condi-tions of climate and soil. The reproductive parts, concernedwith the future needs of the race, are less affected by these out-ward conditions. Cons
Plants and their ways in South Africa . before Sympetalae, and flowers with radial symmetrybefore zygomorphic ones. The less an organ is concerned with special habits, themore important it is for classification. Groups of higher rank Classification of Plants 201 are separated by differences in parts which alter little or plants immediate needs are met by its vegetative organs (root,stem, leaves). These change remarkably under varying condi-tions of climate and soil. The reproductive parts, concernedwith the future needs of the race, are less affected by these out-ward conditions. Consequently the flower is of more import-ance in distinguishing main groups. Besides cohesion of thefloral parts, and the position of the ovary, the seeds, their numberand position, the number of coats, and theipresence or absence ofendosperm, are important factors. The composition and shapeof the leaves are less valuable ; but their position, venation, andpresence or absence of stipules are of importance in dis-tinguishing lower
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplants, bookyear1915
