Eysenhardtia (Leguminosae): Taxonomic revision and relationships

Lang, James M.

doi:10.31274/rtd-180813-17414

Cited by 3 publications

(5 citation statements)

References 23 publications

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“…Tribe Amorpheae has been thoroughly surveyed in the previous studies of Brady et al (1964), Lersten and Wemple (1966) and Lang (1972). My brief survey confirms these reports that the discontinuity plate is present in bud and does not undergo further development, and that the form of the discontinuity plate is constant within species.…”

supporting

confidence: 66%

“…Moreover, within the Amorpheae the degree of development of the discontinuity plate is constant within a species (Brady et al, 1964) and is mature before anthesis . Lang (1972) surveyed 140 collections ofAmorpheae representing about 110 species. He found a discontinuity plate in all species he examined and confirmed that the character is constant within a species and is mature before anthesis.…”

mentioning

confidence: 99%

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A Reevaluation of the Discontinuity Plate in Psoraleeae and Amorpheae (Leguminosae)

Grimes

1986

American Journal of Botany

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The discontinuity plate, once thought to be a unique feature of the Leguminous tribes Psoraleeae and Amorpheae, has been used as evidence for a close relationship of the two tribes. It is here further studied for taxonomic utility. It is shown that the discontinuity plate comprises four phenomena, distributed in four tribes. Tribe Amorpheae has a discontinuity between the pedicellar and gynoecial traces with a profusion of tracheids at the junction of the gynoecial vascular traces, forming a plate‐like structure. This is present and developed at very early stages of the flower and corresponds to the discontinuity plate as originally described. Segregate genera of Psoralea as proposed by Stirton (1981) and Rydberg (1919) also have distinctive vascular features, though these are not the same as the discontinuity plate found in Amorpheae. Psoralea, Otholobium, and all New World genera of Psoraleeae have simple delayed maturation of xylem through the receptacle. Some species of Tephrosia (Tephrosieae) were found to have a similar development. Cullen and Bituminaria (Psoraleeae) have delayed maturation of xylem with an inverted cone‐like structure developing in early fruit. A similar structure was found in species of Desmodium (Desmodieae). Because the discontinuity plate is shown to comprise more than one phenomenon, and since these vascular irregularities are now known in four tribes, the discontinuity plate does not necessarily indicate a close relationship between the tribes Psoraleeae and Amorpheae. Furthermore, the phenomena cannot be assumed to be homologous. More complete developmental studies and a larger survey of the Papilionoideae is needed before the vascular features can be confidently used in systematic hypotheses.

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supporting

confidence: 66%

mentioning

confidence: 99%

A Reevaluation of the Discontinuity Plate in Psoraleeae and Amorpheae (Leguminosae)

Grimes

1986

American Journal of Botany

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“…15 species; Lang 1972), monotypic Apoplanesia, and the other three species of Errazurizia, have five petals, but none have papilionaceous corollas. In all, the lateral and abaxial pairs of petals, corresponding to the wing and keel petals, are not differentiated from one another, and they do not enclose the androecium at anthesis (Lang 1972;Barneby 1977).…”

Section: Introductionmentioning

confidence: 93%

Evolution and Development in the Amorphoid Clade (Amorpheae: Papilionoideae: Leguminosae): Petal Loss and Dedifferentiation

McMahon

Hufford

2005

International Journal of Plant Sciences

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We used comparative developmental morphology to study the evolution of nonpapilionaceous corollas in the amorphoid clade of the tribe Amorpheae (Papilionoideae). This clade consists of five genera in which there are no papilionaceous corollas (five petals differentiated into one banner, two wing, and two keel petals). We studied the ontogenies of three nonpapilionaceous forms: corollas consisting of one petal (exemplified by Amorpha canescens), no petals (Parryella filifolia), and five petals in two types (Errazurizia megacarpa). We compared these to the ontogeny of a papilionaceous corolla (exemplified by the closely related Psorothamnus scoparius). In A. canescens, all petals initiated, but four did not grow beyond the primordial stage. In P. filifolia, no distinct petal primordia were visible. The corolla of E. megacarpa, which has only two types of petals, exhibits nonpapilionaceous characteristics at an early ontogenetic stage. Aside from the earliest primordial mounds, the petals of Psorothamnus and Errazurizia do not resemble each other, indicating that paedomorphosis is not responsible for the nonpapilionaceousness of Errazurizia. Comparing the morphological results to a phylogeny, we infer a single origin of the characteristics that differentiate Errazurizia petals from Psorothamnus petals, and we infer at least two evolutionary events leading to the reduced corolla in Parryella, Amorpha, and Errazurizia rotundata. When considered in the context of the remaining Amorpheae, in which additional floral diversification has occurred, and in the context of the entire papilionoid group, in which floral form is relatively conserved, our results indicate a relaxation of selective or developmental constraint within the clade Amorpheae.

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“…Leaflets, or portions of them from specimens listed in Table 4-1, were cleared and stained by a process modified from Shobe and Lersten (1967), Horner and Arnott (1961), and Lang (1972). Fresh leaflets were first placed in 95^ ethanol to remove chlorophyll; dried material was not so treated.…”

Section: B Materials and Methodsmentioning

confidence: 99%

“…All closely studied preparations had crystals in the bundle sheaths, but only the more mature leaflets had crystals in the mesophyll. Lang (1972), who worked with Psoraleeae leaves, also noted intra-species variation in the presence or absence of mesophyll crystals. To compound this variation, chlorazol black E masks the presence of the crystals, even with the use of crossed polarizing filters.…”

Section: [188%]mentioning

confidence: 96%

A synopsis of Phaseoleae (Leguminosae, Papilionoideae)

Lackey

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Eysenhardtia (Leguminosae): Taxonomic revision and relationships

Cited by 3 publications

References 23 publications

A Reevaluation of the Discontinuity Plate in Psoraleeae and Amorpheae (Leguminosae)

A Reevaluation of the Discontinuity Plate in Psoraleeae and Amorpheae (Leguminosae)

Evolution and Development in the Amorphoid Clade (Amorpheae: Papilionoideae: Leguminosae): Petal Loss and Dedifferentiation

A synopsis of Phaseoleae (Leguminosae, Papilionoideae)

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