Results 131 to 140 of about 1,177 (160)

An Early Cretaceous fruit with affinities to Ceratophyllaceae

American Journal of Botany, 2009
A new genus and species with affinities to Ceratophyllaceae from the Lower Cretaceous of Kansas, USA is reported. The fruits of Donlesia dakotensis gen. et sp. nov. are smooth achenes with two winged lateral spines, two winged facial spines, one stylar spine, and a long peduncle with a distinctive groove. The facial spines are arranged perpendicular to
David L, Dilcher, Hongshan, Wang
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CONDUCTIVE TISSUE IN CERATOPHYLLUM DEMERSUM (CERATOPHYLLACEAE)

1996
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
Schneider, Edward L, Carlquist, Sherwin John   +1 more
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Floral development and phyllotactic variation in Ceratophyllum demersum (Ceratophyllaceae)

American Journal of Botany, 2003
The floral development of staminate and pistillate flowers of Ceratophyllum demersum was observed, with particular focus on the phyllotactic variation in staminate flowers, using scanning electronic microscopy (SEM). We discerned patterns of development of some important new morphological features, e.g., the difference and discontinuity between the ...
Akitoshi, Iwamoto, Akiko, Shimizu, Hideaki, Ohba   +2 more
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Ceratophyllaceae Gray, Nat. Arr. Brit. Pl.

2011
Published as part of Reveal, James L., Chase, Mark W., Iii, - Apg & Iii, Apg, 2011, APG III: Bibliographical Information and Synonymy of Magnoliidae Abstract Kew words Introduction, pp.
Reveal, James L., Chase, Mark W., Iii, - Apg, Iii, Apg   +3 more
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FOSSIL CERATOPHYLLUM (CERATOPHYLLACEAE) FROM THE TERTIARY OF NORTH AMERICA

American Journal of Botany, 1990
Fossil fruits and a vegetative axis assignable to the extant genus Ceratophyllum are described from four North American Tertiary localities. Fossil fruits assignable to the extant species C. muricatum and C. echinatum are reported from the Eocene Green River and Claiborne formations, and the Miocene Esmerelda Formation, respectively. An extinct species,
Patrick S. Herendeen, Donald H. Les, David L. Dilcher   +2 more
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THE ORIGIN AND AFFINITIES OF THE CERATOPHYLLACEAE

TAXON, 1988
SummaryHistorically, the phylogenetic affinities of the Ceratophyllaceae have been vague, however, recent authors have favored a close relationship of the family to the genus Cabomba of the Nymphaeales. An evaluation of critical character distributions by cluster analyses confirmed relationships of Cabomba with Brasenia, Euryale with Victoria, and ...
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GENETIC DIVERSITY IN THE MONOECIOUS HYDROPHILE CERATOPHYLLUM (CERATOPHYLLACEAE)

American Journal of Botany, 1991
This study surveys genetic variation in two clonal, monoecious, water‐pollinated species that differ in their extent of sexuality and distributional range. Electrophoresis was used to quantify allozyme variability in 12 Wisconsin populations of the widespread Ceratophyllum demersum and the rare C. echinatum.
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The Taxonomic Significance of Plumule Morphology in Ceratophyllum (Ceratophyllaceae)

Systematic Botany, 1985
The plumule morphology of the species of Ceratophyllum was studied for the purposes of: 1) determining the extent of variability in forking of the first epicotyl leaves, and 2) evaluating plumule features as taxonomic characters by assessing interspecific and intraspecific (interand intrapopulational) variation.
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A new species of Donlesia (Ceratophyllaceae) from the Early Cretaceous of Kansas, USA

Review of Palaeobotany and Palynology, 2018
Abstract A new species of Donlesia (Ceratophyllaceae) from the Early Cretaceous Cheyenne Sandstone of Kansas, USA is reported. The fruits of Donlesia cheyennensis sp. nov. are achenes with four lateral spines, a stylar spine, and a long pedicel. The four lateral spines are arranged on two perpendicular planes.
Hongshan Wang, David L. Dilcher
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Comparative developmental morphology of two populations of Ceratophyllum L. (Ceratophyllaceae) and their taxonomy

Botanical Journal of the Linnean Society, 1981
Developmental morphology of two natural populations of Ceratophyllum inhabiting the waters of Delhi has been investigated under natural conditions and in aseptic culture. Both the populations show an extreme degree of adaptability to hydrophily. The embryo is unusually highly developed and contains 12-14 whorls of leaves and a few lateral buds. The two
ANITA SEHGAL, H. Y. MOHAN RAM
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