Development of Ovule and Testa of Geranium Pratense L. And Some Other Representatives of the Geraniaceae

Boesewinkel, F. D.; Been, Wike

doi:10.1111/j.1438-8677.1979.tb00357.x

Cited by 29 publications

(41 citation statements)

References 1 publication

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“…Each carpel contains 2 axilar, campylotropous ovules, the lower being abortive (NARAYANA & ARORA, 1963;BOESEWINKEL & BEEN, 1979; BOESEWINKEL, 1997). The style is obsolete, with 5 stigmata, linear or clavate, or rarely short and ovoid or rounded ( fig.…”

Section: Morphological Charactersmentioning

confidence: 99%

Anatomy, Morphology, and Cladistic Analysis of Monsonia L. (Geraniaceae).

Aldasoro¹,

Navarro²,

Vargas³

et al. 2001

Anal. Jard. Bot. Madr.

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Se exploran mediante un an41isis cladfstico las relaciones filogen&icas entre las 25 especies incluidas en el genero Monsonia. Tras una detallada revisi6n se seleccionan 20 caracteres raorfoldgicos y anatomicos, entre ellos algunos previamente no descritos sobre los nectarios, el androceo y los mericarpos. El anSlisis filogen&ico produjo nueve arboles mas parsimoniosos. El arbol de consenso estricto muestra dos clados principales: uno, formado por las nueve especies de Monsonia sect. Monsonia, caracterizadas por las aristas plumosas y las tres de Sarcocaulon que se usaron como grupo externo; y el segundo, fonnado por las 16 especies de Monsonia sect. Olopetalum, que comparten el tipo de separaci6n del mericarpo, la consistencia de la columela y las paredes gruesas en el mericarpo. Como consecuencia surgen nuevas dudas sobre la monofilia de Monsonia. Sin embargo, nuestros datos apoyan la clasificacion subgene'rica actual de Monsonia si se incluyen M. tongipes y M. speciosa en la sect. Olopetalum. Numerosos caracteres del mericarpo estan relacionados con el tipo de zoocoria, lo cual parece derivado en Monsonia al igual que en otras geraniaceas.Palabras clave: anatomi'a, morfologia, anSlisis cladistico, Monsonia, Geraniaceae. Phylogenetip relationships among the 25 species of the old-world genus Monsonia are explored by means of a cladistic analysis. After a detailed revision, 20 morphological and anatomical characters were selected, including some new ones from nectaries, androecium, and mericarps. Phylogenetic analysis yielded 9 most parsimonious trees. The strict consensus tree showed two major clades: one is formed by the 9 species of Monsonia sect. Monsonia, characterised by plumose awns, plus Sarcocaulon; and a second with the 16 species of Monsonia sect. Olopetalum which share the type of mericarp detaching, consistency of columella and the thick mericarp walls. Consequently, some doubts about the monophyly of Monsonia exists. However, the current infrageneric classification of Monsonia is supported after transferring M. longipes and M. speciosa to sect. Olopetalum. Several characters of the mericarp are related to zoochory, which seems to be a derived syndrome in Monsonia, as in the other Geraniaceae.

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Section: Morphological Charactersmentioning

confidence: 99%

Anatomy, Morphology, and Cladistic Analysis of Monsonia L. (Geraniaceae).

Aldasoro¹,

Navarro²,

Vargas³

et al. 2001

Anal. Jard. Bot. Madr.

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“…This combination is found in Geraniales, viz., at least Balanitaceae, Zygophyllaceae, and of Linales, the families Oxalidaceae, Linaceae (Boesewinkel 1980), and Erythroxylaceae, as well as in members of Celastraceae (Celastrales), and Rhizophorales. This group of families in Geraniales, Linales, and Celastrales also has a number of other character states in common (chlorophyllous embryo, fibrous exotegmen, nuclear endosperm formation, etc.)…”

Section: Endothelium (Integumentary Tapetum) (Fig 8)mentioning

confidence: 99%

Steps Toward a Natural System of the Dicotyledons

Dahlgren¹

1991

aliso

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Embryological character states are mapped on the diagrams of dicotyledons (G. Dahlgren 1989). The often well-defined pattern of distribution forms a basis for discussing and clarifying phylogenetic relations. It is shown how numerous embryological characters, alone or in combinations, support certain systematic constellations, even if the character states may have arisen independently within a varying number of evolutionary lines. Characters presented are: anther wall formation; tapetum types; cells in pollen grains at dispersal; microsporogenesis; ovule morphology; ovule integuments; endothelium; obturator; parietal tissue; embryo sac formation; antipodal cells; hypostase, embryogeny; polyembryony; endosperm formation; persistence of endosperm; ruminate endosperm; endosperm haustoria; perisperm; storage compounds in the endosperm; chlorophyllous embryo; embryo size, seed coat characters; arils; dry and wet stigma types.

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“…The exotestal seed coat and the anatropous seed of Dirachma are very much different from those of the Geraniaceae s. str. (Geranium, Erodium, Pelargonium, Monsonia, Sarcocaulon and Hypseocharis) which are always characterized by a crystal-containing endotesta, stellate exotegmic cells and a campylotropous seed with a curved embryo (BOESEWINKEL 1979(BOESEWINKEL , 1988 In general, these genera have tannin-rich seed coats with little differentiation and lack a palisade exotesta (BOESEWINICEL 1997). Because the ovules and seeds of these genera are also different from those of the Geraniaceae s.…”

Section: Discussionmentioning

confidence: 99%

Ovules and seeds ofDirachma socotrana (Dirachmaceae)

Boesewinkel

Bouman

1997

Pl Syst Evol

Self Cite

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Abstract:. Dirachma has a bitegmic, crassinuceltate and anatropous ovule with a single median provascular tegumentary bundle. The seed coat is characterized by an exotesta and an endotegmic pigment layer. Although the fruit of Dirachma superficially resembles that of the Geraniaceae s. str., the characters of ovule and seed do not support a relationship with that family. Also a relationship with Barbeyaceae, as suggested by recent rbcL studies, is not supported by seed anatomical characters. The true relationships of Dirachrna are difficult to assess on the basis of ovule and seed characters alone. The Rhamnaceae may be a closer relative.

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Development of Ovule and Testa of Geranium Pratense L. And Some Other Representatives of the Geraniaceae

Cited by 29 publications

References 1 publication

Anatomy, Morphology, and Cladistic Analysis of Monsonia L. (Geraniaceae).

Anatomy, Morphology, and Cladistic Analysis of Monsonia L. (Geraniaceae).

Steps Toward a Natural System of the Dicotyledons

Ovules and seeds ofDirachma socotrana (Dirachmaceae)

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