Results 161 to 170 of about 4,268 (205)
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Adventive plants from ovules and nucelli in Citrus
Planta, 19721- to 8-week-old ovules and nucelli from three Citrus cultivars-Shamouti and Valencia (Citrus sinensis) oranges and Marsh Seedless (C. paradisi) grapefruit-were cultured in vitro. No embryo differentiation was observed in the explants prior to culture. The Shamouti ovules had degenerated and were apparently unfertilized.
J, Kochba, P, Spiegel-Roy, H, Safran
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Geology, 1978
Studies carried out since 1959 and recently summarized by us have demonstrated higher land plant-type microfossils (trilete spores, spore tetrads, tracheid-like tubes, cuticle-like tissues) from rocks of latest Ordovician to latest Silurian age. Vascular plant body fossils are unknown until mid-Late Silurian (Ludlovian) time.
Jane Gray, Arthur J. Boucot
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Studies carried out since 1959 and recently summarized by us have demonstrated higher land plant-type microfossils (trilete spores, spore tetrads, tracheid-like tubes, cuticle-like tissues) from rocks of latest Ordovician to latest Silurian age. Vascular plant body fossils are unknown until mid-Late Silurian (Ludlovian) time.
Jane Gray, Arthur J. Boucot
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New and rare adventive plants from Kyrgyzstan and Uzbekistan
Novitates Systematicae Plantarum Vascularium, 2011New data on the distribution of miscellaneous alien plants in Kyrgyzstan and Uzbekistan are presented. Five species are recorded for the first time from Middle Asia as well: Cerastium nemorale Bieb., Hesperis pycnotricha Borb. et Degen, Viola prionantha Bunge, Rorippa austriaca (Crantz) Bess., Carduus acanthoides L. One species is new to Kyrgyzstan and
G. Lazkov +3 more
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Invasions of adventive plants in Israel
1990One hundred twenty-three adventive wild species occur in the flora of Israel: 42% are of tropical origin, 22.7% are North American. The geographical distribution suggests that about two thirds of the species reached Israel through neighbouring countries, while only one third arrived directly from their countries of origin.
Amots Dafni, David Heller
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Naturalization of adventive plants in Magadan region
Russian Journal of Biological Invasions, 2011The results of the study on naturalization of adventive plants in Magadan region are given. The list of adventive flora of the region consists of 292 species and includes 22 pseudoaboriginals. Ergasiophygophytes include 42% of ephemerophytes, 34% of colonophytes, 16% of epoecophytes and 8% of agriophytes. Xenophytes consist of 15% of ephemerophytes, 40%
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Nature, 1953
IN a recent paper entitled “Evidence for the Existence of Vascular Land Plants in the Cambrian”, by K. Jacob, (Mrs.) Chinna Jacob and R. N. Shrivastava, to be published shortly in Current Science, we have recorded a few spores and fragments of tracheids of vascular land plants from authentic samples of the Neobolus Shales of the Salt Range, the Middle ...
K, JACOB, C, JACOB, R N, SHRIVASTAVA
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IN a recent paper entitled “Evidence for the Existence of Vascular Land Plants in the Cambrian”, by K. Jacob, (Mrs.) Chinna Jacob and R. N. Shrivastava, to be published shortly in Current Science, we have recorded a few spores and fragments of tracheids of vascular land plants from authentic samples of the Neobolus Shales of the Salt Range, the Middle ...
K, JACOB, C, JACOB, R N, SHRIVASTAVA
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The adventive plants of Cyprus with new records of invasive species
Zeitschrift für Jagdwissenschaft, 2002Georgiades (1994) records 152 adventive species for Cyprus, out of which the following 16 species were regarded as spreading to natural habitats:Vinca major L.,Cistus ladanifer L.,Tagetes minuta L.,Tanacetum balsamita L.,Tanacetum parthenium (L.) Sch.Bip.,Corylus maxima Mill.,Iris albicans Lange,Acacia saligna (Labill.) H.Wendl.,Robinia pseudoacacia L.,
G. Hadjikyriakou, E. Hadjisterkotis
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1957
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
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(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
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Possibility of chemical weathering before the advent of vascular land plants
Nature, 1993CHEMICAL weathering today is generally assumed to occur primarily in soils1,2. The rise of vascular plants during the Silurian and Devonian periods about 400 Myr ago brought about an increase in soil microbial activity and thus in soil CO2 generation, and it has therefore been widely believed that, as a result of these changes, soil CO2 replaced ...
C. K. Keller, B. D. Wood
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Widespread adventive plants in Catalonia
1990About 450 alien vegetal species exist in Catalonia, most of which grow in humanized habitats, although a few are settled in natural vegetation. This chapter includes a small selection of adventive plants in Catalonia which present a well-defined distribution and information of their history it has been available.
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