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Displaying 1 - 10 from the 98 total records
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A Revision of the Genus Aglaonema (Araceae)
Dan Henry Nicolson
66 pages, 23 figures, 1 table
1969 (Date of Issue: 14 August 1969)
Number 1, Smithsonian Contributions to Botany
DOI: 10.5479/si.0081024X.1
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Abstract

This revision of Aglaonema (ranging from northeastern India through New Guinea) is based on study of over 1500 herbarium specimens in 33 herbaria, supplemented by field studies and over 100 personal collections made in southeastern Asia over a period of 18 months. Much of the literature of the genus is reviewed, particularly on cytology, embryology, and morphology. The taxonomic portion of the text includes keys, synonymies, descriptions, notes on range, habitat, typification as well as discussion of taxonomic and nomenclatural problems.

The sections Aglaonema and Chamaecaulon are recognized for the first time. Although 76 binomials have been published for the genus, only 21 are recognized and accepted herein as species. No new species have been recognized.


A Monograph on Foliar Anatomy of the Genera Connellia, Cottendorfia, and Navia (Bromeliaceae)
Harold Robinson
41 pages, 277 figures
1969 (Date of Issue: 10 October 1969)
Number 2, Smithsonian Contributions to Botany
DOI: 10.5479/si.0081024X.2
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The 102 presently known species of the pitcairnioid genera Connellia, Cottendorfia, and Navia are discussed, illustrated, and keyed on the basis of cross sections and epidermal peels of leaves. Comparison with other genera of the bromeliad sub-family Pitcairnioideae indicates Connellia, Cottendorfia, and Navia belong in a series with Ayensua, Brocchinia, Fosterella, Pitcairnia, and Puya that have sharply demarcated chlorenchyma and water-storage layers in the mesophyll. Abromeitiella, Deuterocohnia, Dyckia, Encholirium, and Hechtia seem to be another related series without such sharp demarcation. Connellia is considered related to a series of Cottendorfia species having elongate stomata. Many Cottendorfia species show abaxial water-storage tissue of a structure similar to Puya and some Amazonian species of Pitcairnia. In Navia, the species with paniculate or racemose inflorescences are found to represent three rather distinct groups, one of which seems close to Cottendorfia. Species of Navia with vascular bundles more completely enclosed in chlorenchyma, with scales replaced by trichomes, with sessile or glomerate inflorescences, or with connate and partially reduced sepals are considered specialized. A great number of substomatal variations are recorded in Navia that distinguish species or groups of species. Navia lopezii is shown to have a very modified epidermal structure with simple stomata and no scales, characters unlike any other bromeliad presently known.


Marine Algae of Dominica
Wm. Randolph Taylor and Charles F. Rhyne
16 pages, 2 figures
1970 (Date of Issue: 5 March 1970)
Number 3, Smithsonian Contributions to Botany
DOI: 10.5479/si.0081024X.3
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Abstract

One hundred forty-one species of marine algae are reported from Dominica, W.I., with field notes. An ecological description of twelve collecting localities is given. A discussion of the differences between Agardhiella tenera (J. Agardh) Schmitz of the West Indies and New England is made which results in a new combination, Agardhiella baileyi (Harvey) W. R. Taylor, for the material from New England.


Morden-Smithsonian Expedition to Dominica: The Lichens (Parmeliaceae)
Mason E. Hale, Jr.
25 pages, 29 figures
1971 (Date of Issue: 31 August 1971)
Number 4, Smithsonian Contributions to Botany
DOI: 10.5479/si.0081024X.4
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Abstract

A revision is made of the lichen family Parmeliaceae in Dominica, based on previous published records by Elliott and on collections by the author. Twenty-two species are now known for Parmelia, the only genus in this family on the island. A new species, Parmelia mordenii, is described from rock habitats in the dry scrub woodland.


The Woods and Flora of the Florida Keys: “Pinnatae”
Barrett Nelson Rock
35 pages, 35 figures, 4 tables
1972 (Date of Issue: 4 February 1972)
Number 5, Smithsonian Contributions to Botany
DOI: 10.5479/si.0081024X.5
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Abstract

The “Pinnatae,” comprising six families of woody plants with pinnately compound leaves, is represented on the Florida Keys by at least 16 species. The taxonomic treatment of these families at the ordinal level has been inconsistent. The purpose of this study is to correlate the data derived from intensive study of the xylem anatomy of these 16 species with data from the literature concerning these and other members of the families involved, so that new insight might be gained concerning the taxonomic relationships among these families.

This study indicates that the members of the Pinnatae are anatomically homogeneous. All members possess simple perforation plates, vessel elements having alternate intervascular pitting, fibrous elements with small slitlike simple to vestigially bordered pits, and apotracheal and paratracheal axial parenchyma, or both. Secretory structures, such as crystalliferous idioblasts, parenchymatous cells containing “gum,” and intercellular canals, are of wide occurrence within the Pinnatae. In addition, many species possess septate fibers and axial parenchyma arranged in aggregate patterns, with banded arrangements being most frequent.

There is no anatomical basis for the separation of families into distinct orders in my view. The only separation of families within the Pinnatae suggested by a syndrome of several unique characters, in addition to those common to all members, is the formation of an Anacardiaceae-Burseraceae complex. The members of the Pinnatae belong to a taxon corresponding well with Cronquist's Sapindales.

Phylogenetically, the Pinnatae constitutes an advanced taxon, based on xylem anatomy.


Floral Morphology and Systematics of Lamourouxia (Scrophulariaceae: Rhinanthoideae)
Wallace R. Ernst
63 pages, 36 figures, 1 table
1971 (Date of Issue: 21 July 1972)
Number 6, Smithsonian Contributions to Botany
DOI: 10.5479/si.0081024X.6
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Relationships among the twenty-six species, having an overall range from northern Mexico to central Peru, are analyzed in regard to pollinators and for insight into the differentiation of the three taxonomic sections of the genus. Four new names are proposed, including a section, two species, and a combination. Two new chromosome numbers are reported. Descriptions for each of the species and a dichotomous key are included.


Thespesia populnea (L.) Solander ex Correa and Thespesia populneoides (Roxburgh) Kosteletsky (Malvaceae)
F. R. Fosberg and M.-H. Sachet
13 pages, 6 figures
1972 (Date of Issue: 17 April 1972)
Number 7, Smithsonian Contributions to Botany
DOI: 10.5479/si.0081024X.7
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The pantropical Thespesia populnea (Malvaceae) is shown to be clearly separable into two species: T. populnea, which is pantropical on seashores, and T. populneoides of the Indian Ocean area, extending to Hainan Island, usually, but not always, somewhat inland. Hybrids between the two species occur where their ranges touch, and in Ceylon some of these hybrids have been widely propagated vegetatively as ornamentals and “living fence-posts.”


Three Indo-Pacific Thelypteris Species Reinterpreted and a New African Species Described
F. R. Fosberg and M.-H. Sachet
10 pages, 3 figures
1972 (Date of Issue: 5 May 1972)
Number 8, Smithsonian Contributions to Botany
DOI: 10.5479/si.0081024X.8
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Two species of Thelypteris which have been confused and to which a number of names have been applied were found to be separable by a number of characters. They must now be called Thelypteris opulenta and T. wagneri. Their distribution is Indo-Pacific, extending to Africa, and T. opulenta introduced into tropical America. T. wagneri and an African species, T. fadenii, are here described as new. The name Thelypteris interrupta, heretofore applied to this complex, is shown to be the correct name for what has commonly been called Dryopteris gongylodes and Thelypteris totta.


Genera of Bamboos Native to the New World (Gramineae: Bambusoideae)
F. A. McClure (edited by Thomas R. Soderstrom)
148 pages, 48 figures
1973 (Date of Issue: 11 May 1973)
Number 9, Smithsonian Contributions to Botany
DOI: 10.5479/si.0081024X.9
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Seventeen genera of bamboos native to the New World are classified, compared, and illustrated, including four new genera and four new species. The introduction of several taxonomic characters based on hitherto neglected morphological features, both vegetative and reproductive, is undertaken with the objective of improving traditional perspectives. Two reforms are urged as essential to the elevation of the level of refinement at which future taxonomic treatments of bamboos may be executed. These are (1) the general adoption of improved collecting methods correlated with more extensive and sustained field observations, and (2) the fostering, through interdisciplinary collaboration, of progressive development and integration of diversified studies of documented materials drawn from a common source for each individual taxon.


Fine Structure of the Cortex in the Lichen Family Parmeliaceae Viewed with the Scanning-electron Microscope
Mason E. Hale, Jr.
92 pages, 150 figures, 1 table
1973 (Date of Issue: 5 March 1973)
Number 10, Smithsonian Contributions to Botany
DOI: 10.5479/si.0081024X.10
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The scanning-electron microscope was used to examine the cortical surface of 123 species of lichens in 12 genera of the lichen family Parmeliaceae. Two general types of cortex were found, one consisting of exposed hyphae and one with the hyphae covered by a thin polysaccharide epicortex. The epicorticate species fell into two groups, one with a tightly appressed continuous epicortex and one with a more loosely associated pored epicortex. Type of epicortex is a constant character at the genus and section level and appears to have considerable usefulness in the taxonomy of the family.


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