Angiosperm Phylogeny and Diversification

Stevens, P. F.

doi:10.1016/b978-0-12-800049-6.00257-2

Cited by 338 publications

(427 citation statements)

References 21 publications

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“…This primitive type has been conserved in these early diverging lineages (primary divergences have been dated to c . 100 ± 20 Ma; see references provided by Stevens 2001 onwards), and only modified to some degree in some species of Heisteria .…”

Section: Discussionmentioning

confidence: 99%

Evolution of pollen morphology in Loranthaceae

Grímsson

Grimm

Zetter

2017

Grana

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Earlier studies indicate a strong correlation of pollen morphology and ultrastructure with taxonomy in Loranthaceae. Using high-resolution light microscopy and scanning electron microscopy imaging of the same pollen grains, we document pollen types of 35 genera including 15 studied for the first time. Using a molecular phylogenetic framework based on currently available sequence data with good genus-coverage, we reconstruct trends in the evolution of Loranthaceae pollen and pinpoint traits of high diagnostic value, partly confirming earlier intuitive hypotheses based on morphological observations. We find that pollen morphology in Loranthaceae is strongly linked to phylogenetic relationships. Some pollen types are diagnostic for discrete genera or evolutionary lineages, opening the avenue to recruit dispersed fossil pollen as age constraints for dated phylogenies and as independent data for testing biogeographic scenarios; so far based exclusively on modern-day data. Correspondences and discrepancies between palynological and molecular data and current taxonomic/systematic concepts are identified and suggestions made for future palynological and molecular investigations of Loranthaceae.

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Section: Discussionmentioning

confidence: 99%

Evolution of pollen morphology in Loranthaceae

Grímsson

Grimm

Zetter

2017

Grana

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“…The genus Euphrasia L., previously belonging to the family Scrophulariaceae, is now classified as Orobanchaceae due to its semiparasitic biological features [Szafer et al 1986, Stevens 2001. The genus has been described to comprise 450 species distributed in Asia, Europe, the northern part of America, Indonesian mountains, New Zealand, and the southern part of South America.…”

Section: Introductionmentioning

confidence: 99%

HISTOCHEMICAL INVESTIGATION OF TRICHOMES AND CHEMICAL COMPOSITION OF ESSENTIAL OIL FROM Euphrasia stricta D. Wolff ex J.F. Lehm. (OROBANCHACEAE)

Haratym¹,

Weryszko-Chmielewska²

2017

Acta Sci. Pol. Hortorum Cultus

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Micromorphological and anatomical investigations of trichomes on vegetative and generative organs of the drug eyebright (Euphrasia stricta D. Wolff ex J.F. Lehm.) were carried out. Additionally, identification of the main components of the secreted products was conducted. The following types of glandular structures were found: capitate trichomes (i) with a unicellular head, a neck cell, and a 2-celled stalk, (ii) with a unicellular head, a neck cell, and 3-celled stalk, (iii) with a bicellular head and sporadically with a 3-or 4-celled head; moreover, on the surface of corolla unicellular and 2-3-celled clavate trichomes, ribbon-like trichomes, and papillae were present. Using fluorescence microscopy and histochemical tests, various substances such as lipids, phenolic compounds, terpenes containing steroids, terpenoids, sesquiterpenes, tannins, and flavonoids were determined but only in the capitate trichomes. The analysis of the essential oil showed that its content in the dry herb of E. stricta was on average 0.257%. Gas chromatography revealed the presence of 28 compounds.

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“…Dipcadi is a genus of bulbous flowering plants in the division Tracheophyta, class Liliopsida, order Asparagales, family Asparagaceae and subfamily Ornithogaloideae (also treated as the family Hyacinthaceae, subfamily Scilloideae) (Stevens 2001). It is widely distributed, occurring in southern Europe, most of Africa and the…”

Section: Introductionmentioning

confidence: 99%

“…Middle East through to the Indian subcontinent (Stevens 2001). Species of Dipcadi grow from bulbs and are 'onion like' (Allium spp).…”

mentioning

confidence: 99%