Fruit and seed morphology of &lt;i&gt;Euphorbia aggr. Flavicoma&lt;/i&gt;. Taxonomic implications

Pallisé, Joan Simon; Briones, Julià Molero i; Vergés, Cèsar Blanché i

doi:10.3989/collectbot.1992.v21.102

Cited by 9 publications

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“…The researches are usually restricted to the analysis of the seeds, of which size, shape, ornamentation, seed coat anatomy, development of the endosperm and configuration of the embryo are taxonomically important characteristics, specially to the generic and specific levels (Jordan & Hayden 1992;Simon et al 1992;Webster 1994). Secretory structures are rare in Euphorbiaceae fruits and little to no emphasis is given to them in the few anatomic studies already made.…”

Section: mentioning

confidence: 99%

“…In other Euphorbia species, the fruits vary from subcircular to trilobate in frontal view, having an irregular surface, with indumentum or glabrous, and dimensions varying between 2.38 × 2.66 mm and 4.7 × 5.19 mm among the species and even in the same population (Subils 1977;Simon et al 1992). So, the sampled E. milii fruits, although small in size, are among the largest ones when compared to other species of the genus.…”

Section: mentioning

confidence: 99%

“…Several functions are attributed to the elaiosomes, such as dehydration, hydration, dormancy, and water storage (Lisci et al 1996), and in Euphorbiaceae, they are usually attached to a caruncle (Berg 1975), which has been mentioned for several genera (Singh 1969;Toledo 1963;Liszt et al 1981;Lisci et al 1996;Tokuoka & Tobe 2002;Narbona et al 2005). According to Tokuoka & Tobe (2002), only 10 Acalyphoideae genera have caruncle seeds, and in Crotonoideae and Euphorbioideae, the seeds present caruncle in most genera, but its presence can vary in a same tribe or in different species of a same genus; this occurs in Euphorbia (Simon et al 1992;Webster 1994), where its presence was considered primitive (Simon et al 1992). According to Subils (1977) and Jordan & Hayden (1992), the presence or absence of the caruncle in Euphorbia species has a taxonomic value.…”

Section: mentioning

confidence: 99%

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Pericarp ontogeny and histochemistry of the exotesta and pseudocaruncle of Euphorbia milii (Euphorbiaceae)

Demarco

Carmello-Guerreiro

2011

Rodriguésia

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Several types of fruit occur in Euphorbiaceae, notably the explosively dehiscent dry fruit, and different seed-coat anatomies with taxonomic importance. This paper aims to describe the pericarp ontogeny and structure in Euphorbia milii Desmoul., and evaluate the presence of the secretory exotesta and caruncle. The fruit is a schizocarp, whose the pericarp development begins with a periclinal division of the inner epidermal cells. The derived cells divide, forming about four layers of obliquely elongated cells. Then, the adjacent parenchyma cells elongate, giving rise to a palisade layer and finally, the cells between this layer and the vascular strands undergo mitosis, originating about four layers of elongated cells perpendicularly to the inner oblique cells. These three zones lignify, while the region between the vascular strands and the exocarp, where idioblasts, hypodermis and laticifers are present do not show significant changes. Before the dehiscence, a lysis of cells of the septa and the desiccation of the fruit occur, which causes contraction of the non-lignified tissues and tension between the lignified zones, promoting rupture of each mericarp from central columella and on the dorsal strand, ejecting the seeds. The seeds have pseudocaruncle and the exotesta secretes mucilage, facilitating their imbibition.

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Section: mentioning

confidence: 99%

Section: mentioning

confidence: 99%

Section: mentioning

confidence: 99%

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Pericarp ontogeny and histochemistry of the exotesta and pseudocaruncle of Euphorbia milii (Euphorbiaceae)

Demarco

Carmello-Guerreiro

2011

Rodriguésia

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“…Scanning electron microscopes (SEM) and light microscopes (LM) delineate many taxonomically useful characters, such as testal cell ornamentation, structure of intercellular space, and the shape of the seed and caruncle (Khan, 1964;Richardson~ 1968;Ehler, 1976;Simon et al, 1992). The seed characteristics of Euphorbia have been used to recognize subgeneric (Webster, 1967;Carter and Radcliffe-Smith, 1988), sectional or subsectional (Khan, 1964;Ehler, 1976;Park et al, 1999), and species boundaries (Richardson, 1968;Hassall, 1977;Simon et al, 1992).…”

Section: Tithymalopsismentioning

confidence: 99%

“…The seed characteristics of Euphorbia have been used to recognize subgeneric (Webster, 1967;Carter and Radcliffe-Smith, 1988), sectional or subsectional (Khan, 1964;Ehler, 1976;Park et al, 1999), and species boundaries (Richardson, 1968;Hassall, 1977;Simon et al, 1992). The adaptive significance of some seed characters of Euphorbia species also has been examined (Jordan et al, 1985;Jordan and Hayden, 1992).…”

Section: Tithymalopsismentioning

confidence: 99%

Seed morphology ofEuphorbia sectionTithymalopsis (Euphorbiaceae) and related species

Park

2000

J. Plant Biol.

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Light and scanning microscopies were used to evaluate the sectional boundary of 17 species included by various authors in Euphorbia sect. l~thymalopsis. Based on seed shape, surface ornamentation, and mucilage formation, five seed morphological types were recognized in North American section Tith~nalop$i$ and related species. These results did not provide added support for recent treatment of the sect. 7~th~cnalopsi$ s.s. However, a close relationship was suggested among species of the ~thymalopsi$ subsection Corollatae. In addition, including species from subsections Innocuae, Ipecacuanhae, and Sphaerorhizae within sect. T'sthymalop$i$ could not be justified, based on seed morphological data.

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Seed morphology of 31 EuphorbiaL. species (Euphorbiaceae) in Turkey and their taxonomic significance

Patterson,

Karaismailoğlu,

Küçüker

2024

Microscopy Res & Technique

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This paper includes a comprehensive taxonomical study based on seed morphology of 31 Euphorbia L species from Türkiye. The studied Euphorbia taxa have been examined for morphological traits such as seed color, dimensions, surface ornamentation, cell wall structures, lipid granule presence, and caruncle shape and dimensions with Scanning electron microscopy (SEM) and stereo microscopy to develop a better understanding of the basis of its species. The outcomes show that the species differ based on seed shape and color. The seed width dimensions are between 0.55 and 3.83 mm and the length dimensions are between 1.03 and 5.87 mm. Euphorbia lathyris, E. prostrata, and E. nutans are marked differently from the rest of the studied species based on their seed dimension. The seed surface ornamentation is classified into 12 different types: tuberculate, reticulate, areolate, colliculate, verrucate, alveolate, rugose, alveolate‐reticulate, slightly reticulate, reticulate‐areolate, pusticulate, and ruminate. The most common form is reticulate, found in eight species. The tuberculate (in E. helioscopia), areolate (in E. oblongata), slightly reticulate (in E. amygdaloides), and ruminate (in E. herniariifolia) ornamentation types are each characterized by only one species. The presence of lipid granules and anticlinal and periclinal cell walls disclose interspecific relationships within the examined taxa. Also, an identification key is offered for the studied species based on seed characters.Research Highlights The seeds of Turkish Euphorbia species have been studied in depth. The morphological characters of seeds of Turkish Euphorbia species have been examined utilizing SEM and light microscopy for the first time and discussed the taxonomic practice of these characteristics. A dichotomous key containing seed morphological data has presented.

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Fruit and seed morphology of <i>Euphorbia aggr. Flavicoma</i>. Taxonomic implications

Cited by 9 publications

References 0 publications

Pericarp ontogeny and histochemistry of the exotesta and pseudocaruncle of Euphorbia milii (Euphorbiaceae)

Pericarp ontogeny and histochemistry of the exotesta and pseudocaruncle of Euphorbia milii (Euphorbiaceae)

Seed morphology ofEuphorbia sectionTithymalopsis (Euphorbiaceae) and related species

Seed morphology of 31 EuphorbiaL. species (Euphorbiaceae) in Turkey and their taxonomic significance

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