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Botanizing With Darwin, Duncan M. Porter

Virginia Journal of Science

Note: Sidney S. Negus Memorial Lecture, Radford University, May 25, 2000

From the introduction: In this paper, I will take a look at Darwin's life and some of his botanical and other interests. I will also indicate where his and my paths have crossed during my own career as a botanist.

Contents 19(1)

Aliso: A Journal of Systematic and Floristic Botany

No abstract provided.

Map-Making Of Plant Biomass And Leaf Area Index For Management Of Protected Areas, Loretta Gratani, Maria Fiore Crescente

Aliso: A Journal of Systematic and Floristic Botany

An inventory of the vegetation types of Castelporziano Estate (Rome), including examples of Mediterranean ecosystems in excellent preserved condition, was compiled. Because Leaf Area Index (LAI) changed with forest structure and developmental stages, maximum LAI provided a good estimate of maximum biomass accumulation. Plant biomass estimation, ranging from 61 tons ha^-1 to 360 tons ha^-1, fitted well into 14 biomass classes; the highest values (from 301 tons ha^-1 to 360 tons ha^-1) were related to stratified forested vegetation types, including the more mature Pinus pinea plantations, Quercus ilex evergreen forests and broad leaf mixed …

Wood And Stem Anatomy Of Phytolaccoid And Rivinoid Phytolaccaceae (Caryophyllales): Ecology, Systematics, Nature Of Successive Cambia, Sherwin Carlquist

Aliso: A Journal of Systematic and Floristic Botany

Quantitative and qualitative wood features are presented and analyzed for seven species of subfamily Rivinoideae and four of subfamily Phytolaccoideae. All species have nonbordered perforations plates, as elsewhere in suborder Phylocaccineae. Libriform fibers characterize both subfamilies, but vasicentric tracheids occur in two rivinoid species. Axial parenchyma is vasicentric scanty (apotracheal bands and patches in one species). Rays are mostly multiseriate, with procumbent cells infrequent in most species. Rivinoids and phytolaccoids differ from each other in ray height and width and in crystal types. The xeromorphic wood of Petiveria and Rivina is related to their short duration (woody herbs) in disturbed …

Sem Studies On Vessels In Ferns. 18. Montane Cheilanthoid Ferns (Pteridaceae) Of North America, Sherwin Carlquist, Edward L. Schneider

Aliso: A Journal of Systematic and Floristic Botany

Xylem of roots and rhizomes of five species of four genera of tribe Cheilantheae (Pteridaceae; recently recognized by some as a segregate family, Cheilanthaceae) has been studied by means of scanning electron microscopy (SEM). All of these species occur in habitats (cliffs, talus) of mountains of North America that are seasonally dry in summer and cold in winter. The vessels prove diverse, indicating that different perforation plate modifications are represented in the cheilanthoid ferns of these habitats, rather than different degrees of the same kind of modification. The modifications include wide perforations alternating with narrow perforations (especially prominent in Bommeria); …

Phylogenetic Relationships In Phoradendreae (Viscaceae) Inferred From Three Regions Of The Nuclear Ribosomal Cistron. Ii. The North American Species Of Phoradendron, Vanessa E. T. M. Ashworth

Aliso: A Journal of Systematic and Floristic Botany

A parsimony analysis based on sequences from the ITS region and two partitions of the 26S subunit of nuclear ribosomal DNA was used to infer phylogenetic relationships among the North American species of Phoradendron. A strongly supported clade united all but one of the species typically lacking cataphylls, a character used previously to distinguish the northern species from those of Central and South America. The divergent placement of P. californicum relative to the members of this "northern" clade confirmed the hypothesis that species lacking cataphylls are polyphyletic. Four of five species parasitic on conifers formed a well-supported clade. However, a …

Typification And Change In Status Of Yucca Schottii (Agavaceae), Lee W. Lenz, Michael A. Hanson

Aliso: A Journal of Systematic and Floristic Botany

George Engelmann's concept of Y. schottii as a plant with short, stiff, yellow-green leaves has not been accepted by recent authors who apply the name to plants of southern Arizona with broad, flexible blue-green leaves. Interspecific hybrids among three yuccas present in the area, Y. baccata, Y. elata, and the wide, blue-green leafed plant are common. We believe that Arthur Schott’s collections made in 1853 upon which Engelmann based his description are of hybrid origin. We accept Engelmann's designation as the earliest applicable binomial but accord it a change in status as Y. Xschottii Engelmann pro. …

A Phylogenetic Classification Of Polemoniaceae, J. Mark Porter, Leigh A. Johnson

Aliso: A Journal of Systematic and Floristic Botany

Three hundred seventy nine species of Polemoniaceae are arranged in a phylogenetic classification composed of three subfamilies, eight tribes, and 26 genera. Nomenclature of one tribe is clarified and the circumscription of several tribes differs greatly from previous classifications. Five new genera, Bryantiella, Dayia, Lathrocasis, Microgilia, and Saltugilia, are proposed. In addition, four new species are described from the genera Allophyllum, Dayia, Giliastrum, and lpomopsis. This treatment represents a major reclassification with 59 new combinations, and the application of several additional combinations not used in recent years.

Contents 19(2)

Aliso: A Journal of Systematic and Floristic Botany

No abstract provided.

Wood Anatomy Of Fouquieriaceae In Relation To Habit, Ecology, And Systematics; Nature Of Meristems In Wood And Bark, Sherwin Carlquist

Aliso: A Journal of Systematic and Floristic Botany

Qualitative and quantitative data are presented for wood of all species of Fouquieriaceae, the samples selected so as to cover important variables with respect to organography and age. Wood contains fibertracheids (plus a few vasicentric tracheids). Diffuse axial parenchyma is mostly grouped as diffuse-in-aggregates or diffuse clusters (new term), with transitions to pervasive axial parenchyma in some species. Rays are Heterogeneous Type II. These wood features are relatively unspecialized and are consistent with placement of the family in Ericales s.1. as defined in recent DNA-based cladograms. Xeromorphic wood in nonsucculent species occurs only in Fouquieria shrevei; the lateral branches …

Yuccas (Agavaceae) Of The International Four Corners: Southwestern Usa And Northwestern Mexico, Lee W. Lenz, Michael A. Hanson

Aliso: A Journal of Systematic and Floristic Botany

Yuccas (Yucca, Agavaceae) are an easily recognizable constituent of the vegetation of the International Four Corners; an area made up of portions of Arizona, New Mexico, Sonora and Chihuahua. We recognize three species as native to the region, Yucca baccata, Y. elata and Y. madrensis, together with interspecific hybrids, and document for the first time naturally occurring intersectional hybridization between baccate-fruited (sect. Yucca) and capsular-fruited (sect. Chaenocarpa) species. We examine the reproductive barriers to hybridization operating within the genus, i.e., spatial, temporal and ethological, and we consider circumstances that may have been responsible for the production and …

New Euphorbiaceae From Mexico, Victor W. Steinmann

Aliso: A Journal of Systematic and Floristic Botany

This article contained descriptions of five new taxa of Mexican Euphorbiaceae. Euphorbia (subg. Agaloma) nayarensis is endemic to pine-oak woodland in the mountains of central Nayarit. It appears related to E. soobyi but differs by possessing linear to linear-ovate leaves. Croton varelae is also endemic to central Nayarit. A key was provided to distinguish this species, a member of sect. Geiseleria, from the seven other Mexican species of this section. Croton ramillatus var. magniglandulifer occurs in the states of Guerrero and Morelos. This new variety differs from var. ramillatus by the possession of larger petiolar glands. Croton michaelii …

Index To Volumes 18 And 19

Aliso: A Journal of Systematic and Floristic Botany

No abstract provided.

Letter From The Dean, Charles J. Scifres

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

No abstract provided.

Discovery: The Student Journal Of Dale Bumpers College Of Agricultural, Food And Life Sciences - Volume 1 2000, Several Authors

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

No abstract provided.

Determination Of Chilling Requirement Of Arkansas Thornless Blackberry Cultivars, Chrislyn A. Drake, John R. Clark

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

Little research has been done to determine the chilling requirement for blackberry cultivars. However, field observations from areas where fewer hours of chilling occur indicate that ‘Navaho’ requires more hours of chilling than does ‘Arapaho’. The objective of our study was to determine a method for measuring the chilling requirement using whole plants of two blackberry cultivars, Arapaho and Navaho. One-year old, bare-root plants were field-dug on 26 October 1999 and placed in a cold chamber at 3ºC. Ten single-plant replications of each cultivar were removed at 100-hour intervals up to 1000 hours. The plants were potted and placed in …

Instructions For Authors, Discovery Editors

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

No abstract provided.

Abstracts From The Student Presentations Of The Arkansas Chapter Of Gamma Sigma Delta, Discovery Editors

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

No abstract provided.

Raised Beds Prevent Waterlogging And Increase Productivity, Greg Hamilton, Derk Bakker, David Houlebrook, Cliff Spann

Journal of the Department of Agriculture, Western Australia, Series 4

Permanent Raised Beds are proving to be a revolutionary means of preventing waterlogging and a substantially increasing the productivity of wet and poorly productive land in Western Australia. In just three years, a research project has seen significant improvements in yield and reductions in waterlogging.

Reviewers Of Manuscripts, Volumes 18 And 19

Aliso: A Journal of Systematic and Floristic Botany

No abstract provided.

Autophagomyces, Bordea, And A New Genus, Rossiomyces, (Laboulbeniales), Richard K. Benjamin

Aliso: A Journal of Systematic and Floristic Botany

A revision of Autophagomyces (Laboulbeniales) was made based on a comparative morphological study of new collections and 16 species included in the genus by Thaxter in the final volume of his monograph published in 1931 and by others more recently. The concept of Autophagomyces (species on Anthicidae, Phalacridae, and Scapidiidae [Coleoptera]) was narrowed and comprises 12 species, four of them new, i.e., A. hammondii, A. mexicanus, A. protuberans, and A. ramosus. The genus Bordea (species on Pselaphinae, Staphylinidae [Coleopteraj), which had been included in Autophagomyces by Thaxter, was reinstated and comprises 14 species, seven new, i.e., …

Histology Of Somatic Embryogenesis In Cultured Leaf Explants Of Pistachio(Pistacia Veral), Ahmet Onay

Turkish Journal of Botany

The histology of somatic embryo initiation and development in pistachio ( Pistacia were L.) embryogenic masses (EMS) derived from leaf explants was examined using light microscopy. Explants with somatic embryos at different developmental stages were fixed for histological examination, cut into 10 µm thick sections, stained with hematoxylin-eosin and observed microscopically. The histological examination showed that the two types of cell clusters induced originated from explants and were morphologically different. These results clearly demonstrate that the induction and development of somatic embryos from leaf explants of pistachio were from single epidermal or subepidermal cells.

Contents, Discovery Editors

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

No abstract provided.

Optical Transmittance Of A Rice Leaf Via Ray Tracing, Stephen Nicoletti, Alois (Al) J. Adams

Journal of the Arkansas Academy of Science

Optical reflectance from a plant leaf increases in response to stress and disease. Previous studies at the University of Arkansas at Little Rock found that, while the reflectance from a rice leaf increased with increased salinity, reflectance changes could not be used to differentiate one stress or disease from another. The objective of this study is to characterize the angular distribution of optical transmittance for a healthy rice leaf using a ray tracing technique and assuming a three-media optical model. The ultimate goal is to relate this distribution to specific plant pathologies. Three rays are traced through the cross section …

Floristic Status Of Log Ferns (Dryopteris) In Arkansas, James H. Peck

Journal of the Arkansas Academy of Science

The fern flora of Arkansas consists of 96 taxa, including five species and three hybrids of the Log Fern genus Dryopteri This report summarizes a twenty year floristic and ecologic study of their distribution and abundance in Arkansas. Historica data are presented to review the slow accumulation of taxa reported in floras of Arkansas from early collectors to 1980 and the rapid accumulation of taxa since 1980 employing modern field techniques. Chorological data and floristic data are presented based on field, herbarium, and literature studies to correct the record and document the known localities of the eight Arkansas taxa: Dryopteris …

Characteristics Of Some Fruiting Plant Species In Northwest Arkansas, And The Avian Assemblages That Feed On Them, John W. Prather, Kimberly G. Smith, Michael A. Mlodinow, Cecilia M. Riley

Journal of the Arkansas Academy of Science

Fruits continue to be recognized as an important food source for birds in temperate areas, particularly during the fall migration period. More than 20 species of plants producing fleshy fruits are found in the Arkansas Ozarks. However, only a few of these appear to be important resources for birds during the fall migration period (August - October). Among those are sassafras (Sassafras albidum), gray-backed grape (Vitis cinerea), black cherry (Prunus serotina), hercules club (Araliaspinosa) and pokeweed (Phytolacca americana). Over the past 4 years, we have documented the physical and nutritional characteristics of those fruits and taken observational data on the …

K-State Turfgrass Research 2000, Kansas State University. Agricultural Experiment Station And Cooperative Extension Service

Kansas Agricultural Experiment Station Research Reports

This publication contains results of projects done throughout 1999 by K-State turfgrass researchers. You can see many of these projects in progress on August 3, 2000 at the Kansas Turfgrass Field Day. This will be held at the Rocky Ford Turfgrass Research Center in Manhattan. What questions can we answer for you? Maybe you're curious about the best performing tall fescue cultivars for lawns, bermudagrasses for fairways, or bentgrasses for greens. If you need to know how to manage fungicide programs to control diseases on tall fescue lawns or bentgrass greens, that information is here. As a superintendent, maybe you're …

Pollen Flora Of Pakistan -Xx. Molluginaceae, Anjum Perveen, Mohammad Qaiser

Turkish Journal of Botany

The pollen morphology of 3 species belonging to the 2 genera of the Molluginaceae family were investigated using light microscopy and scanning microscopy. It was found to be stenopalynous in nature. The pollen grains are usually radially symmetrical, isopolar, oblate-spheroidal to prolate-spheroidal or sub-prolate, tricolpate. The tectum is scabrate-punctate. On the basis of the shape of the pollen, 2 distinct pollen types were identified, viz., Glinus lotodies type and Mollugo cerviana -type.

Algal Flora Of Lakes Aygir And Balıkli (Trabzon, Turkey), Bülent Şahi̇n

Turkish Journal of Botany

The algal flora of lakes Aygir and Balıkli were studied qualitatively between June and Septembeer 1996. The flora of Lake Aygır was found to consist of 48 species, 26 belonging to Bacillariophyta, 17 to Chlorophyta, 4 to Cyanophyta and 1 to Euglenophyta. The flora of Lake Balıklı was found to consist of 71 species, 34 belonging to Bacillariophyta, 29 to Chlorophyta, 7 to Cyanophytaand 1 to Euglenophyta. The compositions of the species in the two lakes were similar. The main species of the algal flora of the lakes were members of Desmidiales.

Growth And Proline Content Of Germinating Wheat Genotypes Under Ultraviolet Light, Yavuz Demi̇r

Turkish Journal of Botany

The effect of ultraviolet light on the growth and proline contents of four wheat cultivars ( Triticum aestivum L., cvs. Bezostoja-1, Dogu-88, Turkey-13, Yayla-305) was investigated. Ultraviolet light inhibited the growth of all of the four wheat cultivars and increased the daily proline contents of both the radicle and coleoptile. Ultraviolet light is a stress factor in the growth of plants but the wheat cultivars tested produced proline against this stress. From the results obtained, it is suggested that proline can protect cells against damage induced by ultraviolet radiation.