By Franklin S. Axelrod

Have you puzzled the place a Puerto Rican plant grows, while it plants, the place it comes from? good, this is an annotated list of the vascular vegetation shortly discovered becoming within the wild at the island of Puerto Rico that would be a useful reduction to botanists, ecologists, foresters and anybody else attracted to the plant life of Puerto Rico. the following you can find the distribution of vascular crops in the island supplied in response to a singular scheme that comes with either huge physiographic parts and particular geographical websites. those are either defined within the textual content and illustrated by means of 3 maps. additionally, you will locate invaluable details at the instances of flowering, fruiting, and spore creation for every plant and in addition references for every one to contemporary monographs on Puerto Rican vegetation the place a fuller description of every may be found.

In the prior few years there were many alterations within the names of person plant taxa (species, subspecies, and forms) and within the alignment of plant households. those alterations are recorded during this paintings in this type of method that older medical names in addition to Spanish universal names may be tracked to new authorised ones. because there's a lot overlap of the Puerto Rican plant life with that of different Caribbean islands and components, those nomenclatural alterations can also be of use to researchers operating in these areas.

This list covers 2909 taxa which are incorporated in 1053 genera and 210 households. of those taxa 2335 (80.2%) are local and 574 (19.7%) are unique; of the local ones, 243 (10.4%) are endemic.

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Zeitschrift fur Botaniche, 1, 253-283. Fahn, A. (1967) Plant Anatomy. Pergamon Press, Toronto. Fourcroy, M. (1942) Perturbations anatomiques interessant Ie faisceau de la racine au voisinage des radicelles. Annales des Sciences Naturelles Botanique, 3, 177-198. G. (1951) Cambial formation in isolated pea roots following decapitation. American Journal of Botany, 38, 596-604. S. (1977) Transfer cells and their roles in transport of solutes in plants. Scientific Progress Oxford, 64, 539-568. L. (1975) The initiation and development of root buds.

X 120. extending into the soil beyond the root surface, and a Hartig net of intercellular hyphae in the cortex of the root in gymnosperms (Fig. 4b) or between epidermal cells only in many angiosperms. The gymnosperm Pinus probably shows the most pronounced structural changes in roots which become mycorrhizal. e. bearing a population of long and short roots [58, 97]. These root types are distinguishable structurally in the primordium stage but subsequent 25 conversion of one type to the other may occur [98, 99].

93. Ginzburg, C. (1966) Formation des racines laterales dorm antes chez Zygophyllum dumosum. Academie des Sciences, Comptes Rendus, Paris, 263, 909-912. 30 94. N. & Allen, E. (1949) The anatomy of the nodular growths on the roots of Tribulus cistoides L. Proceedings of the Soil Science Society of America, 14, 179-183. 95. Vartanian, N. (1981) Some aspects of structural and functional modifications induced by drought in root systems. Plant and Soil, 63, 83-92. 96. S. & Couderc, H. (1983) Scanning electron microscopic aspects 97.

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