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Articles 6901 - 6930 of 10759

Full-Text Articles in Botany

Plant Species Disjunctions, Daniel J. Crawford, Nam Sook Lee, Tod F. Stuessy Jan 1992

Plant Species Disjunctions, Daniel J. Crawford, Nam Sook Lee, Tod F. Stuessy

Aliso: A Journal of Systematic and Floristic Botany

The use of molecular data in the study of plant species disjunctions is reviewed and evaluated. The major reason for employing molecular information is to estimate genetic divergence between morphologically similar disjunct species. Flavonoid chemistry offers few advantages over morphology because it is difficult, if not impossible, to infer genetic divergence from the arrays of flavonoid compounds sequestered by two species. Also, flavonoids can, like morphological characters, undergo stasis. Rather direct evidence for this comes from the fact that extant and fossil species may have identical or nearly identical flavonoids. Enzyme electrophoresis is useful for estimating divergence between disjunct species …

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A Revision Of The Allium Fimbriatum (Alliaceae) Complex, Dale W. Mcneal Jan 1992

A Revision Of The Allium Fimbriatum (Alliaceae) Complex, Dale W. Mcneal

Aliso: A Journal of Systematic and Floristic Botany

Allium fimbriatum in California and northern Baja California causes frequent difficulty in identification. The species, as defined by Ownbey, comprises nine varieties and is characterized by great morphologic diversity. No single character or suite of characters separates this species from others in the A. sanbornii alliance. This investigation was undertaken to survey the large number of herbarium specimens that have accumulated since Ownbey's study and to observe all of the taxa in the field or garden, something not accomplished by Ownbey. Orientation of the perianth segments, visible only in living material, along with shape and presence or absence of denticulation, …

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Phytochemical Profile Of Hydrostachys Insignis (Hydrostachyaceae), Ron Scogin Jan 1992

Phytochemical Profile Of Hydrostachys Insignis (Hydrostachyaceae), Ron Scogin

Aliso: A Journal of Systematic and Floristic Botany

Foliar material of Hydrostachys insignis contains kaempferol 3-glucoside and kaempferol 3-sophoroside. Iridoids, proanthocyanidins, acteoside, alkaloids, hydrolyzable tannins (ellagic acid), cyanogenic glycosides, and saponins could not be detected. This chemical profile does not support proposed relationships between Hydrostachyaceae and either Podostemaceae or members of the Scrophulariales. It is proposed that the chemical profile of Hydrostachyaceae reflects phylogeny, not convergence to an aquatic habitat; but the profile does not suggest any accurate systematic alignment of Hydrostachyaceae.

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Plan For Neridup Creek Catchment Neridup Soil Conservation Group, Martyn G. Keen Jan 1992

Plan For Neridup Creek Catchment Neridup Soil Conservation Group, Martyn G. Keen

Soil conservation survey collection

This report was initiated at the request of the Neridup Soil Conservation Group as an aid to overcoming the degradation problems of the catchment known as the Neridup Creek Catchment.Work was commenced on collecting data about the catchment in May 1990 and has continued on a part-time basis as workload has permitted. This report outlines the physical details of the catchment, predicts runoff peak flows and contains recommendations as a framework for stable land use within the catchment.Attached to this report are: a set of maps of physical details, a set of plans related to individual degradation problems requiring solutions …

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Wood Anatomy Of Hedyosmum (Chloranthaceae) And The Tracheid-Vessel Element Transition, Sherwin Carlquist Jan 1992

Wood Anatomy Of Hedyosmum (Chloranthaceae) And The Tracheid-Vessel Element Transition, Sherwin Carlquist

Aliso: A Journal of Systematic and Floristic Botany

Qualitative and quantitative data are presented for 22 collections of 14 species of Hedyosmum. Wood of the genus is primitive in its notably long scalariform perforation plates; scalariform lateral wall pitting of vessel elements; and the low ratio of length between imperforate tracheary elements and vessel elements. Pit membrane remnants are characteristically present to various degrees in perforations of vessel elements; this is considered a primitive feature that is related to other primitive vessel features. Specialized features of Hedyosmum wood include septate fiber-tracheids with much reduced borders on pits; vasicentric axial parenchyma; and absence of uniseriate rays (in wood …

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'Living Soil' Seminar, Department Of Agriculture, Western Australia Jan 1992

'Living Soil' Seminar, Department Of Agriculture, Western Australia

Agriculture reports

Provides an opportunity for farmers and those involved in the agricultural service industry, to focus on what happens in the soil. Seminar reflects the interest detected amongst farmers in knowing more about the things that influence plant growth and a genuine concern about the environment.

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A Complete Index To The Butler University Botanical Studies, A Journal Of Original Research Published By Butler University 1929-1964, Rebecca W. Dolan Jan 1992

A Complete Index To The Butler University Botanical Studies, A Journal Of Original Research Published By Butler University 1929-1964, Rebecca W. Dolan

Scholarship and Professional Work - LAS

For 35 years, the Botany Department of Butler University published a journal of research conducted by Butler faculty, students. and other Indiana botanists. Many of the papers contain valuable historical studies. especially floristic surveys that document Indiana's vegetation in past decades. This article presents a complete index for the journal. arranged both chronologically and alphabetically. Reprints of articles are still available.

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Genera Incertae Sedis, Stephen L. Wood, Donald E. Bright Jr. Jan 1992

Genera Incertae Sedis, Stephen L. Wood, Donald E. Bright Jr.

Great Basin Naturalist Memoirs

No abstract provided.

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Family Scolytidae, Stephen L. Wood, Donald E. Bright Jr. Jan 1992

Family Scolytidae, Stephen L. Wood, Donald E. Bright Jr.

Great Basin Naturalist Memoirs

No abstract provided.

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Index For Platypodidae, Stephen L. Wood, Donald E. Bright Jr. Jan 1992

Index For Platypodidae, Stephen L. Wood, Donald E. Bright Jr.

Great Basin Naturalist Memoirs

No abstract provided.

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Subfamily Scolytinae, Stephen L. Wood, Donald E. Bright Jr. Jan 1992

Subfamily Scolytinae, Stephen L. Wood, Donald E. Bright Jr.

Great Basin Naturalist Memoirs

No abstract provided.

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List Of Museum Type Repositories, Stephen L. Wood, Donald E. Bright Jr. Jan 1992

List Of Museum Type Repositories, Stephen L. Wood, Donald E. Bright Jr.

Great Basin Naturalist Memoirs

No abstract provided.

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Addendum, Stephen L. Wood, Donald E. Bright Jr. Jan 1992

Addendum, Stephen L. Wood, Donald E. Bright Jr.

Great Basin Naturalist Memoirs

No abstract provided.

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Subfamily Hylesininae, Stephen L. Wood, Donald E. Bright Jr. Jan 1992

Subfamily Hylesininae, Stephen L. Wood, Donald E. Bright Jr.

Great Basin Naturalist Memoirs

No abstract provided.

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Family Platypodidae, Stephen L. Wood, Donald E. Bright Jr. Jan 1992

Family Platypodidae, Stephen L. Wood, Donald E. Bright Jr.

Great Basin Naturalist Memoirs

No abstract provided.

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Subfamily Coptonotinae, Stephen L. Wood, Donald E. Bright Jr. Jan 1992

Subfamily Coptonotinae, Stephen L. Wood, Donald E. Bright Jr.

Great Basin Naturalist Memoirs

No abstract provided.

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Front Matter, Vol. 13b Jan 1992

Front Matter, Vol. 13b

Great Basin Naturalist Memoirs

No abstract provided.

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Subfamily Platypodinae, Stephen L. Wood, Donald E. Bright Jr. Jan 1992

Subfamily Platypodinae, Stephen L. Wood, Donald E. Bright Jr.

Great Basin Naturalist Memoirs

No abstract provided.

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Full Issue, Vol. 13b Jan 1992

Full Issue, Vol. 13b

Great Basin Naturalist Memoirs

No abstract provided.

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Index For Scolytidae, Stephen L. Wood, Donald E. Bright Jr. Jan 1992

Index For Scolytidae, Stephen L. Wood, Donald E. Bright Jr.

Great Basin Naturalist Memoirs

No abstract provided.

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Endemism In The Vascular Flora Of The Juan Fernandez Islands, Tod F. Stuessy, Clodomiro Marticorena, Roberto Rodriguez R., Daniel J. Crawford, Mario Silva O. Jan 1992

Endemism In The Vascular Flora Of The Juan Fernandez Islands, Tod F. Stuessy, Clodomiro Marticorena, Roberto Rodriguez R., Daniel J. Crawford, Mario Silva O.

Aliso: A Journal of Systematic and Floristic Botany

The Juan Fernandez archipelago contains 361 vascular plant species including 53 ferns, 65 monocots, and 243 dicots. Represented are 73 families and 219 genera. There is one endemic family (Lactoridaceae), 12 endemic genera, and 126 endemic species. The native vascular flora has II% endemism at the generic level and 60% at the specific level. Among the endemic species, 23 are ferns, 15 are monocots, and 88 are dicots. Of the endemic dicots, 29 species are Compositae, making up 33% of the endemic dicot flora. Most (97%) of the endemic angiosperms are perennials, and 64% of the dicots are woody (shrubs, …

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The Presence Of Taxol And Related Compounds In Taxus Baccata Native To The Ukraine (Crimea), Georgia, And Southern Russia, Thomas S. Elias, Vladislav V. Korzhenevsky Jan 1992

The Presence Of Taxol And Related Compounds In Taxus Baccata Native To The Ukraine (Crimea), Georgia, And Southern Russia, Thomas S. Elias, Vladislav V. Korzhenevsky

Aliso: A Journal of Systematic and Floristic Botany

Twenty-eight leaf and twig samples and one bark sample of Taxus baccata from the Ukraine (Crimea), Russia, and Georgia were analyzed for taxane compounds. Taxol and the related diterpenoid I 0-deacetylbaccatin III (baccatin III) were present in all samples and 20.7% of those samples exhibited a taxol content nearly equal to or greater than that obtained from the bark of the Pacific Yew, T. brevifolia. Taxus baccata is a potential significant source of taxol, the most promising new drug identified in the last twenty years for the treatment of selected forms of cancer.

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Petiolar Anatomy Of North American Astragalus Species (Fabaceae) With Persistent Petioles, Thomas Engel Jan 1992

Petiolar Anatomy Of North American Astragalus Species (Fabaceae) With Persistent Petioles, Thomas Engel

Aliso: A Journal of Systematic and Floristic Botany

The petiole and rachis anatomy of 11 North American Astragalus species that show a tendency towards persistent petioles is described and illustrated by line drawings of representative transections. The results are compared with those of a spine anatomical survey of 200 Old World Astragalus and Astracantha species. Attention was given to the anatomical characters previously determined to be taxon-specific such as the amount and position of sclerenchyma and distribution patterns of vascular bundles. Character evolution and the classification of species into sections are discussed. A fundamental difference between New World and Old World Astragalus s.1. species was found. Most of …

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Pogogyne Floribunda (Lamiaceae), A New Species From The Great Basin In Northeastern California, James D. Jokerst Jan 1992

Pogogyne Floribunda (Lamiaceae), A New Species From The Great Basin In Northeastern California, James D. Jokerst

Aliso: A Journal of Systematic and Floristic Botany

Pogogyne jloribunda is described as a new endemic species from Lassen and Modoc counties in northeastern California. Its occurrence on the eastern Modoc Plateau of the Great Basin Floristic Province is the first record for the genus outside the California Floristic Province. Pogogyne zizyphoroides also is reported from the Great Basin in Lassen County.

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Abnormal Cones In Cupressus Sempervirens, Simcha Lev-Yadun Jan 1992

Abnormal Cones In Cupressus Sempervirens, Simcha Lev-Yadun

Aliso: A Journal of Systematic and Floristic Botany

Abnormal cones found in Cupressus sempervirens include bisexual cones and double female and male cones. They are very infrequent, but there are individual trees with a tendency to produce such cones. We suggest that these cones reflect changes in normal hormonal balance.

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A New Genus Of Laboulbeniales (Ascomycetes) On A Species Of Phalacrichus (Coleoptera: Dryopoidea: Limnichidae), With A Note On Mirror-Image Asymmetry In The Order, Richard K. Benjamin Jan 1992

A New Genus Of Laboulbeniales (Ascomycetes) On A Species Of Phalacrichus (Coleoptera: Dryopoidea: Limnichidae), With A Note On Mirror-Image Asymmetry In The Order, Richard K. Benjamin

Aliso: A Journal of Systematic and Floristic Botany

A new genus ofLaboulbeniales, with two species, Phalacrichomyces normalis (type) and P. anomalus, is described from Phalacrichus diligens (Coleoptera: Dryopoidea; Limnichidae). Phalacrichomyces is placed in the Stigmatomycetinae of the Laboulbeniaceae where it appears to be most nearly related to Stemmatomyces and Synandromyces among the other 39 genera of the subtribe. The new taxa are characterized and salient features of the structure and development of their ascomata are summarized and illustrated with photographs and line drawings. The ascomata of associated pairs of P. anomalus display a remarkable degree of mirror-image asymmetry. This phenomenon, which appears to be a characteristic, although …

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Aggregated Cones In Pinus Halepensis, Simcha Lev-Yadun Jan 1992

Aggregated Cones In Pinus Halepensis, Simcha Lev-Yadun

Aliso: A Journal of Systematic and Floristic Botany

Aggregated female cones were found in 192 Pinus halepensis trees growing in 54 populations in Israel, in habitats of vastly differing ecological conditions. All of these trees also carried normal (1-5 in a whorl) female cones. The number of aggregates per tree varied from one to several dozen. Some of the trees formed aggregates every year, after the first year of aggregate formation, while others formed aggregates only once, or at long intervals. Not all cones in the aggregates reached maturity. The number of cones in an aggregate ranged from six to 62, and they were usually smaller than normal. …

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New Records Of Vertebrates In Southwestern Arkansas, C. Renn Tumlison, Mark R. Karnes, Mark E. Clark Jan 1992

New Records Of Vertebrates In Southwestern Arkansas, C. Renn Tumlison, Mark R. Karnes, Mark E. Clark

Journal of the Arkansas Academy of Science

No abstract provided.

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Key To Subject Areas, Stephen L. Wood, Donald E. Bright Jr. Jan 1992

Key To Subject Areas, Stephen L. Wood, Donald E. Bright Jr.

Great Basin Naturalist Memoirs

No abstract provided.

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Full Issue, Vol. 13a Jan 1992

Full Issue, Vol. 13a

Great Basin Naturalist Memoirs

No abstract provided.

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