By Franklin S. Axelrod
Have you questioned the place a Puerto Rican plant grows, while it plants, the place it comes from? good, here's an annotated list of the vascular vegetation shortly came upon turning out to be within the wild at the island of Puerto Rico that would be a useful relief to botanists, ecologists, foresters and anybody else drawn to the flowers of Puerto Rico. the following you will discover the distribution of vascular crops in the island supplied in keeping with a singular scheme that includes either extensive physiographic parts and particular geographical websites. those are either defined within the textual content and illustrated through 3 maps. additionally, you will locate worthy details at the occasions of flowering, fruiting, and spore construction for every plant and likewise references for every one to contemporary monographs on Puerto Rican crops the place a fuller description of every may be found.
In the earlier 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 the sort of approach that older medical names in addition to Spanish universal names could be tracked to new approved ones. considering there's a lot overlap of the Puerto Rican vegetation with that of different Caribbean islands and parts, those nomenclatural adjustments can 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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Additional info for A Systematic Vademecum to the Vascular Plants of Puerto Rico
Shoot K+ concentrations of all species decreased significantly with increase in salinity level, whereas root K+ of all species remained unaffected. Pennisetum divisum and Leptochloa fusca contained relatively higher shoot K+ at 16 and 24 dS m-1, respectively. Puccinellia distans showed relatively lower shoot K+ at 8 and 24 dSm-1. Panicum turgidum had the highest root K+ of all five species at 16 and 24 dSm-1. Shoot Ca2+ concentrations of Panicum turgidum and Puccinellia distans increased with increase in salinity level, whereas the remaining three species did not show any consistent pattern of increase or decrease in shoot Ca2+.
2002b. Improving seed germination of Salicornia rubra (Chenopodiaceae) under saline conditions using germination regulating chemicals. Western North American Naturalist 62: 101-105. , Gul, B. J. 2002c. Seed germination in the Great Basin halophyte Salsola iberica. Canadian Journal of Botany 80: 650-655. , Gul, B. J. 2004a. Action of plant growth regulators and salinity on the seed germination of Ceratoides lanata. Canadian Journal of Botany 82: 37-42. , Gul, B. J. 2004b. Temperature and high salinity effect in germinating dimorphic seeds of Atriplex rosea.
4 40 M. ASHRAF ET AL. Figure 2. Fresh and dry weights of shoots and roots of five grass species after six weeks growth at varying salinity levels in sand culture. Percent fresh and dry matters of Leptochloa fusca and Puccinellia distans remained unaffected at all salt treatments (Table 5). In contrast, percent biomass production in Pennisetum divisum was severely inhibited by salinity. Percent root biomass was inhibited in all the species except Panicum turgidum. Increasing salt treatments had no significant effect on shoot/root ratio of all five-grass species.