L'emploi des caractères épidermiques dans l'étude taxonomique du Festuca rubra lato sensu (Poaceae)

1996 ◽  
Vol 74 (3) ◽  
pp. 469-485 ◽  
Author(s):  
Martin Dubé ◽  
Pierre Morisset
Keyword(s):  
Morphological Variation ◽  
Festuca Rubra ◽  
Leaf Epidermis ◽  
Eastern Canada ◽  
Anatomical Characters

The leaf epidermis from a collection of 33 specimens encompassing most of the morphological variation of Festuca rubra in Eastern Canada and including two cytotypes (2n = 42 and 2n = 56) is described with 16 characters. The leaf epidermal composition differs markedly between culms and vegetative shoots. Many epidermal characters, particularly those from the vegetative shoots, are among the best ones for distinguishing between the two cytotypes. Parallel analyses using nine anatomical characters show the greater taxonomical potential of epidermis. Keywords: Festuca rubra, leaf, epidermis, anatomy, cytotypes.

Morphological and leaf anatomical variation in Festuca rubra sensu lato (Poaceae) from eastern Quebec

1987 ◽  
Vol 65 (6) ◽  
pp. 1065-1077 ◽  
Author(s):  
Martin Dubé ◽  
Pierre Morisset
Keyword(s):  
Salt Marshes ◽  
Anatomical Variation ◽  
Similarity Analysis ◽  
Festuca Rubra ◽  
Classification Problems ◽  
Geographical Factors ◽  
Variation Patterns ◽  
Character Variation ◽  
Anatomical Characters ◽  
Weak Structure

The variation of 52 morphological and anatomical characters was analysed in 32 populations of Festuca rubra L. sensu lato from salt marshes, coastal rocks, coastal sands, and anthropogenic sites in eastern Quebec. The results show that the variation of characters is essentially continuous within and between populations, that some populations are much more variable than others, and that on the whole, character variation patterns are mainly related to ecological rather than geographical factors. The weak structure revealed by a similarity analysis of populations is the source of the classification problems within this species.

Anatomical and micromorphological studies on Teucrium sect. Isotriodon (Lamiaceae) in Turkey with a taxonomic note

Biologia ◽  
2012 ◽  
Vol 67 (4) ◽  
Author(s):  
Muhittin Dinç ◽  
Süleyman Doğu
Keyword(s):  
The Other ◽  
Isolated Population ◽  
Leaf Epidermis ◽  
Palisade Parenchyma ◽  
Vegetative Organs ◽  
Anatomical Studies ◽  
Anatomical Features ◽  
Anomocytic Stomata ◽  
Anatomical Characters ◽  
Trichome Types

AbstractIn this study, the anatomical features of the leaf and stem, besides the nutlet characteristics of some Teucrium sect. Isotriodon (Lamiaceae) taxa in Turkey, T. montbretii Betham subsp. montbretii, T. montbretii subsp. pamphylicum P. H. Davis, T. odontites Boiss. & Bal., T. cavernarum P. H. Davis, T. antitauricum T. Ekim, along with an isolated population of T. montbretii (T. montbretii subsp.) were investigated. The anatomical studies revealed that the taxa share generally similar anatomical characters, such as thicker upper leaf cuticles and larger upper leaf epidermal cells compared to lower ones and diacytic to anomocytic stomata on the leaves. However, the portion of the mesophyll occupied by palisade parenchyma and the occurrence of mucilage cells in leaf epidermis shows difference among the taxa. Furthermore, the studied taxa have general stem characteristics of the Lamiaceae family, except for having poorly developed collenchyma at the corners. With the amphistomatic leaves and developed sclerenchymatic tissue in the leaf median vein, T. cavernarum is seperated from the other taxa. Trichome types on the vegetative organs and nutlet shape and sculpturing are generally the same or similar in the studied taxa, but trichomes on the nutlets are different among them. Based on nutlet characteristics and some morphological ones, it was revealed that the isolated population of T. montbretii represent a new subspecies, T. monbretii subsp. yildirimlii M.Dinç & S.Doğu subsp. nov.

La variation des caractères épidermiques foliaires chez le Festuca rubra sensu lato (Poaceae) dans l'est du Canada

1996 ◽  
Vol 74 (9) ◽  
pp. 1425-1438 ◽  
Author(s):  
Martin Dubé ◽  
Pierre Morisset
Keyword(s):  
Discriminant Analysis ◽  
Festuca Rubra ◽  
Eastern Canada ◽  
Discriminant Analyses

The variation structure of epidermal characters in Festuca rubra in Eastern Canada is compared with the structure produced by morphology and anatomy. This study is based on 94 specimens including native and introduced variants as well as hybrids. The characters best separating these variants are selected by a series of discriminant analyses. Epidermis then appears as useful as anatomy and morphology in establishing a taxonomical system in this aggregate of taxa. Keywords: Festuca rubra, epidermis, anatomy, morphology, discriminant analysis.

Cutandia rigescens (Poaceae) a new species to the flora of Iran: distribution, taxonomy and ecology

Phytotaxa ◽  
2019 ◽  
Vol 419 (3) ◽  
pp. 287-300
Author(s):  
SAMEREH TIRGAN ◽  
ALIREZA NAQINEZHAD ◽  
ZEINAB HOSEINZADEH
Keyword(s):  
Cross Section ◽  
Sand Dunes ◽  
Vascular Bundles ◽  
Leaf Epidermis ◽  
Distribution Map ◽  
Flora Of Iran ◽  
The Caspian Sea ◽  
Anatomical Characters ◽  
First Time ◽  
A New Species

During a revision of the genera Cutandia and Catapodium in Iran (Poaceae: subtribe Parapholiinae), the occurrence of Cutandia rigescens was confirmed for the first time on sand dunes along the southern shore of the Caspian Sea in the northern part of the country. Twenty-five important morphological and anatomical characters were examined in an attempt to separate this species from Cutandia dichotoma, C. memphitica and Catapodium rigidum, similar taxa already recorded from Iran. In addition to the morphology of the glume, lemma and palea, the most diagnostic characters proved to be: size and shape of long cells in the intercostal zone of leaf epidermis, size of short cells and long cells in the costal zone of the leaf epidermis, size of angular prickles in the leaf epidermis, number and size of vascular bundles in a cross-section of the culm, the presence or absence of parenchymatous cells in the center of the culm and number of florets. Distribution map for Iran, together with vegetation data were presented for all four species.

FERTILITY AND POLYPLOIDY OF EUPHORBIA CYPARISSIAS IN CANADA

1953 ◽  
Vol 31 (2) ◽  
pp. 152-163 ◽  
Author(s):  
R. J. Moore ◽  
D. R. Lindsay
Keyword(s):  
North America ◽  
Chromosome Number ◽  
Somatic Chromosome ◽  
Herbarium Specimens ◽  
Leaf Epidermis ◽  
Somatic Chromosome Number ◽  
Eastern Canada ◽  
European Species ◽  
Diploid Populations ◽  
Euphorbia Cyparissias

Euphorbia cyparissias L., a European species originally introduced into North America as an ornamental, is now firmly established on roadsides and pastures in Eastern Canada. The Canadian distribution is mapped from specimens in three herbaria. Plants with a somatic chromosome number of 20 and plants with the number 2n = 40 occur in eastern Ontario and adjacent Quebec. According to all available evidence for this region, the diploid plants never set seed, whereas the tetraploid populations are highly fertile. The cells of the upper leaf epidermis of the tetraploid plants are conspicuously larger than those of the diploid plants. By means of this criterion, the probable chromosome number of herbarium specimens was determined. The distribution of the diploid and tetraploid plants in Ontario and western Quebec is mapped. Tetraploid plants are known from eight locations in this area; five of these infestations are serious. It is believed that the sterility of the diploid populations is due to a genic condition which may interrupt normal pollen development.

Nouvelles observations cytologiques chez Festuca rubra sensu lato (Poaceae) dans l'Est du Canada

1995 ◽  
Vol 73 (8) ◽  
pp. 1289-1294 ◽  
Author(s):  
Martin Dubé ◽  
Pierre Morisset
Keyword(s):  
Chromosome Number ◽  
Key Words ◽  
Natural Habitat ◽  
Festuca Rubra ◽  
Eastern Canada ◽  
Natural Habitats

Sixty-one chromosome number determinations in Festuca rubra L. from eastern Canada show that hexaploids plants (n = 21) are found in both natural habitats and ruderal places, octoploids rhizomatous plants (n = 28) are mostly found in ruderal places, but also in disturbed natural habitats. Morever, one aneuploid (2n = ca. 48) is found from a natural habitat and intercytotype hybrids are found in ruderal places or disturbed natural habitats. Key words: Festuca rubra, cytotypes, hybrids.

Morphological variation in diagnostic features for two Culex (Culex) species of the Neotropical Region (Diptera: Culicidae) 

Zootaxa ◽  
2015 ◽  
Vol 4052 (5) ◽  
pp. 573 ◽  
Author(s):  
MAGDALENA LAURITO ◽  
WALTER R. ALMIRÓN
Keyword(s):  
Morphological Variation ◽  
Phylogenetic Relationships ◽  
Male Genitalia ◽  
Intraspecific Variability ◽  
Morphological Characters ◽  
Neotropical Region ◽  
Diagnostic Features ◽  
Accurate Identification ◽  
Anatomical Characters

The classification of Culex L., with 768 species worldwide (Harbach 2015), is based mainly on adult anatomical characters (Harbach et al. 2012). The accurate identification of the 198 species included in the subgenus Culex is dependent on a few morphological characters, principally of the male genitalia (Harbach et al. 2012). Most species within Culex (Culex) have been described based on male genitalia due to their low intraspecific variability compared to characters of females and larvae. Male genitalia provide synapomorphic characters useful in establishing phylogenetic relationships in Culicidae (Reinert et al. 2008, Reidenbach et al. 2009, Harbach et al. 2012, Laurito & Almirón 2013), as well as autapomorphic traits allowing specific identifications. 

The stratigraphic importance of species of Sumatradinium, Barssidinium, and Erymnodinium, Neogene dinoflagellate genera from offshore eastern Canada

1994 ◽  
Vol 31 (3) ◽  
pp. 567-582 ◽  
Author(s):  
Judith K. Lentin ◽  
Robert A. Fensome ◽  
Graham L. Williams
Keyword(s):  
New Species ◽  
Morphological Variation ◽  
Generic Diagnosis ◽  
Dinoflagellate Cysts ◽  
Eastern Canada ◽  
Specific Diagnosis ◽  
Constituent Species ◽  
Rich Diversity ◽  
Biostratigraphic Subdivision

The Neogene strata of offshore eastern Canada contain a rich diversity of dinoflagellate cysts. Among the most distinctive are species of the peridinialean genus Sumatradinium and the related genera Barssidinium gen.nov. and Erymnodinium gen.nov. Sumatradinium and Erymnodinium have a reticulate wall, whereas Barssidinium has a smooth to granulate wall. Sumatradinium and Barssidinium have processes or pustules only; Erymnodinium has crests. The three genera and their constituent species are useful for biostratigraphic subdivision in the Miocene and Pliocene, as exemplified in the two wells Evangeline H-98 and Heron H-73; stratigraphic control for these wells is based on previously established palynologic data. To categorize the considerable morphological variation of these genera and promote their biostratigraphic usefulness, we propose five new species: Sumatradinium druggii, Sumatradinium pustulosum, Barssidinium evangelineae, Barssidinium graminosum, and Barssidinium wrennii. We also emend the generic diagnosis of Sumatradinium and the specific diagnosis of Sumatradinium hispidum.

Morphological variation inNepeta nuda L

1982 ◽  
Vol 93 (1-2) ◽  
pp. 71-76
Author(s):  
S. Kokkini ◽  
D. Babalonas
Keyword(s):  
Morphological Variation
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