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Articles 1 - 17 of 17
Full-Text Articles in Life Sciences
Malaysian Deforestation Proceeds Apace, Paul Faulstich
Malaysian Deforestation Proceeds Apace, Paul Faulstich
Pitzer Faculty Publications and Research
A hunger fast, dubbed Fast Action, was staged in front of the Japanese Consulate General in Honolulu on July 20 to protest the destruction of the most ancient and biologically diverse ecosystem on Earth. Organized by Hawai'i Earth First! and the O'ahu Rainforest Action Group, Fast Action was designed to alert people to the destruction of tropical rainforests in Sarawak, Malaysia. Protesters demanded on immediate moratorium on the cutting of rainforests in,which the Penan and other-native peoples live.
The Fascinating History Of The Early Botanical Exploration And Investigations In Southern California, Mildred E. Mathias
The Fascinating History Of The Early Botanical Exploration And Investigations In Southern California, Mildred E. Mathias
Aliso: A Journal of Systematic and Floristic Botany
Information on plant collectors in southern California is scattered through a number of publications, some of them obscure or not well known to botanists. This paper gives a selective account of major collectors from 1793 to 1930. The appendix lists the plant collectors with references to biographical material concerning each. It is hoped that this preliminary account will stimulate further historical studies.
Wood And Bark Anatomy Of The New World Species Of Ephedra, Sherwin Carlquist
Wood And Bark Anatomy Of The New World Species Of Ephedra, Sherwin Carlquist
Aliso: A Journal of Systematic and Floristic Botany
Quantitative and qualitative data are presented for wood of 42 collections of 23 species of Ephedra from North and South America; data on bark anatomy are offered for most of these. For five collections, root as well as stem wood is analyzed, and for two collections, anatomy of horizontal underground stems is compared to that of upright stems. Vessel diameter, vessel element length, fiber-tracheid length, and tracheid length increase with age. Vessels and tracheids bear helical thickenings in 10 North American species (first report); thickenings are absent in Mexican and South American species. Mean total area of perforations per mm …
Wood And Bark Anatomy Of Degeneria, Sherwin Carlquist
Wood And Bark Anatomy Of Degeneria, Sherwin Carlquist
Aliso: A Journal of Systematic and Floristic Botany
Wood anatomy of the recently described Degeneria roseiflora differs from that of D. vitiensis by possessing narrower vessels, much thicker-walled vessels and fiber-tracheids, abundant uniseriate rays, and greater numbers of ethereal oil cells in rays. Because both large and smaller wood samples of D. vitiensis were studied, ontogenetic changes in the wood are presented and separated from those features that probably vary with the species. Tyloses and perforated ray cells are newly reported for Degeneria. Anatomy of mature bark of D. roseiflora is described. Wood anatomy of Degeneria is moderately primitive. Although Degeneria is often compared to Himantandraceae and …
New Species Of Scutellaria (Lamiaceae) From The Chihuahuan Desert Region, James Henrickson
New Species Of Scutellaria (Lamiaceae) From The Chihuahuan Desert Region, James Henrickson
Aliso: A Journal of Systematic and Floristic Botany
Three new species of Scutellaria are described from the Chihuahuan Desert Region of Mexico: S. hintoniorum from western Nuevo León, S. wendtii from eastern Chihuahua, and S. carmenensis from northern Coahuila.
Wood And Bark Anatomy Of Empetraceae; Comments On Paedomorphosis In Woods Of Certain Small Shrubs, Sherwin Carlquist
Wood And Bark Anatomy Of Empetraceae; Comments On Paedomorphosis In Woods Of Certain Small Shrubs, Sherwin Carlquist
Aliso: A Journal of Systematic and Floristic Botany
Wood and bark of 12 collections of Empetraceae representing three genera containing seven species (one with two subspecies) are analyzed with respect to quantitative and qualitative features. Empetraceae have vessels somewhat angular in transection, with scalariform perforation plates and scalariform to opposite vessel-ray pitting. Imperforate tracheary elements are all tracheids. Axial parenchyma is sparse and not subdivided. Rays are characteristically uniseriate and composed of upright cells (older stems have rays with both upright and procumbent cells). These features ally Empetraceae closely to Ericaceae and Epacridaceae. The narrow vessels, quite numerous per mm2 , denote a high degree of wood …
Relationships Among Wood Variables In Two Species Of Ring-Porous Trees, D. W. Woodcock
Relationships Among Wood Variables In Two Species Of Ring-Porous Trees, D. W. Woodcock
Aliso: A Journal of Systematic and Floristic Botany
One way of assessing the functional significance of wood-anatomical variables is by examining the relationships among these variables. This paper presents results of factor analysis of wood variables in two species of ring-porous trees (Quercus rubra and Fraxinus americana). Factor analysis of vessel diameter and density, conductive area, and conductivity in the early- and latewood plus width of the early- and Iatewood increment reveals from three to four independent sources of variance. Generally, these can be characterized as diameter-related factors in the early- and latewood, tentatively related to water conduction, and a factor identified with width of the …
Steps Toward The Natural System Of The Dicotyledons, William C. Dickison
Steps Toward The Natural System Of The Dicotyledons, William C. Dickison
Aliso: A Journal of Systematic and Floristic Botany
The value of vegetative anatomy in phylogenetic analysis is documented. Examples of the use of vegetative anatomy at different taxonomic levels show the continuing role of the anatomical method in building a more natural system of classification of the dicotyledons. The importance of correlating wood and leaf anatomical features with ecological and floristic preferences of taxa is emphasized. Caution is required in basing phylogenetic interpretations upon similarities and differences in xylem structure. The transition from scalariform to simple perforation plates is the only aspect of vessel element evolution that is not potentially reversible and all phylogenetic analyses must reflect this …
A New Scandent Species Of Bidens (Asteraceae) From The Balisas River Basin, Mexico, Jose Luis Villaseñor
A New Scandent Species Of Bidens (Asteraceae) From The Balisas River Basin, Mexico, Jose Luis Villaseñor
Aliso: A Journal of Systematic and Floristic Botany
Bidens esmartinezii from the Balsas River Basin, Michoacan and Guerrero, Mexico, differs from B. reptans var. urbanii and B. squarrosa, the only other climbing species occurring in the area, by its entire, mostly linear leaf lobes and its larger, brown achenes.
Stem And Leaf Anatomy Of The Alseuosmiaceae, William C. Dickison
Stem And Leaf Anatomy Of The Alseuosmiaceae, William C. Dickison
Aliso: A Journal of Systematic and Floristic Botany
The stem and leaf anatomy of five species representing all three genera of the small Southwest Pacific dicotyledonous family, Alseuosmiaceae, were studied. Salient anatomical features common to all genera include: a trilacunar, three-trace leaf-node structure in which petioles are supplied with three separate vascular bundles; rosoid teeth bearing hydathodes; anomocytic stomata; unicellular, bicellular, and multicellular, unbranched, living trichomes; a superficial origin of periderm; leafmesophyll composed of a uniseriate palisade region and a loosely constructed spongy zone; and the presence of a stem and foliar endodermis. Sclerenchyma occurs in stem tissues of species belonging to all three genera and Crispiloba disperma …
A Monograph Of Sabal (Arecaceae: Coryphoideae), Scott Zona
A Monograph Of Sabal (Arecaceae: Coryphoideae), Scott Zona
Aliso: A Journal of Systematic and Floristic Botany
This monographic study of the New World genus Sabal (Arecaceae: Coryphoideae) recognizes 15 species. In addition to defining species limits and distributions, the study addresses broader questions concerning likely modes of speciation in the group and biogeographic radiation. The systematic treatment incorporates results from extensive field work and studies of leaf anatomy and flavonoid phytochemistry, ecology and biogeography, and morphology. Distribution maps and a key to the taxa are provided. Solutions are offered for the many nomenclatural problems that existed in the genus. A phylogenetic hypothesis, the first for the genus, is proposed. Moreover, phytochemical and anatomical features are examined …
The Genera Of Asteraceae Endemic To Mexico And Adjacent Regions, Jose Luis Villaseñor
The Genera Of Asteraceae Endemic To Mexico And Adjacent Regions, Jose Luis Villaseñor
Aliso: A Journal of Systematic and Floristic Botany
The flora of Mexico includes about 119 endemic or nearly endemic genera of Asteraceae. In this study, the genera are listed and their distribution patterns among the floristic provinces of Mexico analyzed. Results indicate strong affinities of the endemic genera for mountainous and arid or semiarid regions. Since its first appearance in Mexico, the Asteraceae diversified into these kinds of habitats, which were produced mostly by recurrent orogenic and climatic phenomena. The specialized tribes Heliantheae and Eupatorieae are richly represented, a fact that places Mexico as an important secondary center of diversification for the Asteraceae.
Dudleya Cymosa Subsp. Costafolia (Crassulaceae), A New Subspecies From The Southern Sierra Nevada, Tulare County, California, Jim A. Bartel, James R. Shevock
Dudleya Cymosa Subsp. Costafolia (Crassulaceae), A New Subspecies From The Southern Sierra Nevada, Tulare County, California, Jim A. Bartel, James R. Shevock
Aliso: A Journal of Systematic and Floristic Botany
Dudleya cymosa subsp. costafolia, a new subspecies from the southern Sierra Nevada, Tulare County, California, is described and illustrated. Along with bright yellow flowers, the cespitose plant produces numerous, small rosettes with rib-shaped linear to linear-oblanceolate leaves, which are unique to the subspecies. The authors have searched numerous other rock outcrops, especially limestone, in the general area for additional plants with no success. Dudleya cymosa subsp. costafolia evidently is restricted to a solitary limestone outcrop north of the South Fork of the Middle Fork of the Tule River.
Monardella Stebbinsii (Lamiaceae), A New Serpentine Endemic Species From The Northern Sierra Nevada, Plumas County, California, Clare B. Hardham, Jim A. Bartel
Monardella Stebbinsii (Lamiaceae), A New Serpentine Endemic Species From The Northern Sierra Nevada, Plumas County, California, Clare B. Hardham, Jim A. Bartel
Aliso: A Journal of Systematic and Floristic Botany
Monardella stebbinsii (Lamiaceae ), a new species from the northern Sierra Nevada of Plumas County, California, is described and illustrated. Characterized by ovate leaves, multiple verticillasters per infiorascence, a matlike habit, reddish papery bracts, and purplish-red leaves with a soft white pubescence, the species is not closely related to any other species of the genus. The new species is apparently restricted to the central portion of a serpentine outcrop located north and east of the confluence of the North Fork of the Feather River and its East Branch.
A New Species Of Leucospora (Scrophulariaceae) From The Chihuahuan Desert Of Mexico, James Henrickson
A New Species Of Leucospora (Scrophulariaceae) From The Chihuahuan Desert Of Mexico, James Henrickson
Aliso: A Journal of Systematic and Floristic Botany
A new species, Leucospora coahuilensis, is described that is similar to Schistophragma intermedia in vegetative and floral characteristics, but has seed characteristics of Leucospora showing the value of combining the two genera under the latter genus.
Morphological Stasis Abd Molecular Divergence In The Intercontinental Disjunct Genus Datisca (Datiscaceae), Aaron Liston, Loren H. Rieseberg, Thomas S. Elias
Morphological Stasis Abd Molecular Divergence In The Intercontinental Disjunct Genus Datisca (Datiscaceae), Aaron Liston, Loren H. Rieseberg, Thomas S. Elias
Aliso: A Journal of Systematic and Floristic Botany
The genus Datisca comprises two species and has an intercontinentally disjunct distribution: D. cannabina is native to southwest and central Asia, whereas D. glomerata is distributed from northern California to northern Baja California. In 1975, Axelrod proposed a geohistorical scenario to account for such "Madrean-Tethyan links," suggesting that these disjunctions resulted from migration across the mid-Atlantic from the Paleogene up to the Neogene, approximately 23 to 65 m.y.a. The two species are quite similar in most phenotypic traits which have been studied to date. The major difference between the two involves their breeding system: D. cannabina is dioecious while D. …
Wood Anatomy Of Ascarina (Chloranthaceae) And The Tracheid-Vessel Element Transition, Sherwin Carlquist
Wood Anatomy Of Ascarina (Chloranthaceae) And The Tracheid-Vessel Element Transition, Sherwin Carlquist
Aliso: A Journal of Systematic and Floristic Botany
Quantitative and qualitative features are presented for 13 collections of 8 species of Ascarina. Wood anatomy is maximally primitive in most respects; moderate exception occurs in the imperforate tracheary elements, which range from tracheidlike (A. solmsiana) to fiber-tracheids (septate in two species). Perforation plates are scalariform, average more than 100 bars per plate, and have bordered bars. Even more significantly, portions of the primary walls in perforations characteristically fail to dissolve; these pit membrane portions range from nearly intact (much like the pit membranes in pits on end walls of tracheids of vesselless dicotyledons) to remnant strands …