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Showing 1 to 20 of 20 for “"Compositae"”.
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Isolation in Tragopogon (Compositae)
Two species of the familiar goat's beard or salsify genus Tragopogon were studied to determine the role and significance of interspecific hybridization in speciation within the genus. Field observations indicate the common occurrence of interspecific hybrids between T. pratensis, a yellow-flowered …
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A taxonomic study of Chrysanthemoides Tourn. ex Medik. (Compositae)
A phenetic analysis based on 33 morphological characters of Chrysanrhemoides Tourn. ex Medik. revealed 12 major clusters of• operational taxonomic units (OTU's). A further four taxa were clustered within c. monilifera (L.) T. Norl. ssp. pisifera (L.) T. Norl. ,• var. pisifera form 1, var. pisifera …
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The Taxonomy of Lactuca (Compositae) in North America North of Mexico
Made available in DSpace on 2014-12-05T22:00:13Z (GMT). No. of bitstreams: 1 6104370.pdf: 10385901 bytes, checksum: ed44b9590f0d8fc17a65f030e709abf1 (MD5) Previous issue date: 1961
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Systematic Studies of Xanthium (Compositae: Ambrosieae); The Cockleburs of Tazewell County, Illinois
Made available in DSpace on 2014-12-11T18:28:21Z (GMT). No. of bitstreams: 1 7212211.pdf: 2949634 bytes, checksum: 9fd122995a3816fbffe1a5b7e8d1ab65 (MD5) Previous issue date: 1971
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Chionodes mediofuscella (Clemens) (Lepidoptera:Gelechiidae), an indigenous insect infesting the seeds of giant ragweed (Ambrosia trifida L.) (Compositae)
Ragweeds are anemophilic composites belonging to the genus Ambrosia, and are the most important aeroallergens in North America. Ambrosia trifida L., giant ragweed, is a ruderal plant widely distributed throughout the eastern and central portions of North America. The greatest concentration of this …
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Phytochemical and biological investigation of erigeron annus (L.) Pers for antimicrobial activity and potential DNA gyrase inhibitors
Compositae plants of the genus Erigeron have ca. 390 species, widely distributed in in most temperate regions around the world. Erigeron annus (L.) Pers. (fleabane) is one of the most valuable plants in the genus, used in Chinese folk medicine to treat indigestion, malaria, enteritis, hepatitis and …
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An analysis of the establishment and impact of an exotic insect, Rhinocyllus conicus Froehling (Coleoptera: Curculionidae), on Carduus nutans L. and Carduus acanthoides L. (Campanulatae: Compositae) in Virginia with notes on their biologies
Studies over a two-year period were undertaken to evaluate the potential and effect of Rhinocyllus conicus as a biological control agent for Carduus nutans and C. acanthoides in Virginia. Over an 81 day range, 25 females oviposited an average of 100.5 eggs. Life expectancy did not differ between …
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ΣΥΜΒΟΛΗ ΣΤΗΝ ΕΡΕΥΝΑ ΤΗΣ ΜΥΚΗΤΟΧΛΩΡΙΔΑΣ ΤΗΣ ΝΗΣΟΥ ΚΡΗΤΗΣ. ΤΑΞΙΝΟΜΙΚΗ ΚΑΙ ΧΛΩΡΙΔΙΚΗ ΜΕΛΕΤΗ ΤΩΝ UREDINALES
… STUDY OF THE RUST FUNGI ATTACKINGHOSTS OF THE COMPOSITAE WITH THE LIGHT MICROSCOPE AS WELL AS WITH THE SCANNING ELECTRON MICROSCOPE HAS FAVORED THE SEGREGATION OF CERTAIN TAXA FROM THE "COMPOUND SPECIES". IN ADDITION, SEVERAL TAXONOMIC PROBLEMS ON RUST FUNGI ATTACKING HOST PLANTS IN VARIOUS …
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Ecological and Evolutionary Consequences of Variation in Clutch Size in Asteromyia Carbonifera (o.s.) (Diptera: Cecidomyiidae)
… of Canadian goldenrod, Solidago canadensis (Compositae). Female midges deposit one to five offspring per gall. During their brief adult existence, females produce a number of galls. The number of eggs laid at each ovipositional site is termed the "clutch size." Midge larvae are potential …
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Ceuthorrhynchidius horridus panzer (Coleoptera: curculionidae) -- the host specificity of the first instar, notes on the insect's biology, and methods of adult aestival diapause termination
The subtribe Carduinae (Compositae: Cynareae) consists of many thistle species which are becoming an ever increasing economic menace to range and pasture lands. A phytophagous weevil, Ceuthorrhynchidius horridus Panzer has been found to be associated with these weeds in Europe, but cannot be …
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The Function of Insect Trapping by Penstemon Digitalis and Cirsium Discolor
… and Cirsium discolor (Muhl) Spreng (Compositae), sticky substances that capture insects are produced in the inflorescences. I tested four hypotheses as to the function of insect-trapping in these two plant species: (1) Direct defense against herbivores; (2) Indirect defense against …
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The application of numerical methods to the taxonomy of Spermatophyta: with evaluation of the taxonomic implications of the results
… is split into the 'Aaclepioids', 'Acanthoids', Compositae and Umbelliferae.<br/><br/>Pilot analyses on anatomical data for hardwoods and softwoods are also considered. In the former case the interrelationships of the three subfamilies of Leguminosae are questioned, The Caesalpinioideae, regarded …
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A Geographic Mosaic of Speciation in Eurosta solidaginis
… galls on tall goldenrod (Solidago altissima; Compositae) in North America with populations in the forest and prairie biomes of Minnesota, which are under divergent ecologically-based selection pressures. Previous research indicates that the goldenrod, the gallfly, and the natural enemies of …
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THE IMPLICATIONS OF ATMOSPHERIC POLLEN RAIN FOR FOSSIL POLLEN PROFILES IN THE ARID SOUTHWEST (AEROBIOLOGY, PALAEOBOTANY, TAPHONOMY, PRESERVATION).
… Chenopodiaceae-Amaranthus, Ambrosia, Other Compositae and Graminear are commonly found; Morus is rarely found. Pinus, Sphaeralcea, Boerhaavia and Kallstroemia are present in low numbers. These taxa have thick pollen walls, and they resist destruction. Seasonally collected soil samples have …
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A taxonomic revision of the genus pentatrichia (asteraceae)
Abstract provided by author
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Cytotoxic compounds from the genus Centaurea.
… the genus Centaurea (Family: Asteraceae alto Compositae), a large genus of about 500 species. The first three chapters deal with an introduction of natural products and Centaurea species, followed by the isolation and characterisation of compounds from twelve Centaurea species. The last …
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Eupator in Cb20sHb25sOb36sHNOb3s: the active principle of Eupatorium perfoliatum
Made available in DSpace on 2016-11-09T23:48:14Z (GMT). No. of bitstreams: 2 5956094_opt.pdf: 12891091 bytes, checksum: 193ad28302c2be22447b79bbfb3c6a16 (MD5) license.txt: 4183 bytes, checksum: 1dcc2037833d76bede73d5717587543b (MD5) Previous issue date: 1891
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Comparative plasticity of rare Pityopsis ruthii and its common congener P. graminifolia
The natural world is dynamic, and species must successfully respond to the environmental changes they experience. Pityopsis ruthii (Ruth’s golden aster) is an imperiled endemic perennial confined to boulder crevices along short stretches of the Hiwassee and Ocoee Rivers in Polk County, TN. To …