A revision of the genus Hydrocharis (hydrocharitaceae)

Cook, Christopher D.K.; Lüönd, Ruth

doi:10.1016/0304-3770(82)90097-3

Cited by 45 publications

(61 citation statements)

References 32 publications

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“…No infra-specific taxa have been described and Cook and Lüönd (1982), in their comprehensive taxonomic monograph, did not highlight variation within this species. attention.…”

Section: Namementioning

confidence: 93%

“…1 mm long; pollen ca. 15 Fm in diameter or 21-36 Fm in diameter (Cook and Lüönd 1982), rounded, without apertures, radiosymmetric and covered with spines. Female flowers are borne on peduncles up to 9 cm long; sepals 4-5 mm long, greenish-white; petals broadly obovate to orbicular, 10-15 mm long, white or with a faint pinkish tinge; staminodes simple, bifurcate or bifid; stigmas 6, up to 5 mm long, divided to 1/4-2/3 of their length.…”

Section: Namementioning

confidence: 99%

“…Female flowers are borne on peduncles up to 9 cm long; sepals 4-5 mm long, greenish-white; petals broadly obovate to orbicular, 10-15 mm long, white or with a faint pinkish tinge; staminodes simple, bifurcate or bifid; stigmas 6, up to 5 mm long, divided to 1/4-2/3 of their length. Seeds are transversely elliptic, approximately 1 mm long, densely covered with stout blunt processes, each with a spiral pattern on the outer surface (Cook and Lüönd 1982). References made to ridged or winged seeds (Butcher 1961;Catling and Dore 1982) have not been confirmed and may be a result of the pattern of drying mucilage that surrounds each seed rather than the actual seed surface.…”

Section: Namementioning

confidence: 99%

“…Several authors report 2n = 28 for Eurasian material (Tuschnjakowa 1929;Maude 1940;Ehrenberg 1945;Skalinska and Piotrowicz 1961;Gadella and Kliphuis 1973;Murin 1976;Löve 1980;Dvorak 1989). In summarizing information on chromosomes of H. morsus-ranae, Cook and Lüönd (1982) note that it possessed one pair of long sub-metacentric chromosomes, the rest being of medium length, metacentric, acrocentric, or short metacentric. Meiosis is reported to be regular.…”

Section: Namementioning

confidence: 99%

“…It has been suggested on the basis of seed structure that Hydrocharis dubia is actually a Limnobium (Shaffer-Fehre 1991) but this requires further study. A key to the three species is provided by Cook and Lüönd (1982), who distinguish H. morsus-ranae by the combination of leaf lamina with two or three pairs of primary veins and paired stipules. Hydrocharis morsus-ranae differs from most other North American aquatics in having rounded leaves with 5 prominent and converging primary veins, but these characters do not distinguish it from floating-leaved forms of the North American frogbit (Limnobium spongia (Bosc.)…”

Section: Namementioning

confidence: 99%

See 4 more Smart Citations

The biology of Canadian weeds. 124. Hydrocharis morsus-ranae L.

Catling¹,

Mitrow²,

Haber³

et al. 2003

Can. J. Plant Sci.

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Catling, P. M., Mitrow, G., Haber, E., Posluszny, U. and Charlton, W. A. 203. The biology of Canadian weeds. 124. Hydrocharis morsus-ranae L. Can. J. Plant Sci. 83: 1001-1016. European frog-bit (Hydrocharis morsus-ranae L.), a free-floating, stoloniferous aquatic, is native to Europe and parts of Asia and Africa. It was discovered in Canada in 1932 in Ottawa, but earlier introduction is possible. By 1955 its North American distribution extended from Ottawa to Montreal. By 1980 it had extended southwest to Lake Ontario and northeast to Quebec City. Recently it has spread throughout much of the central and southwestern parts of southern Ontario, and further into northern New York and Vermont and eastern Michigan. The maximum rate of spread has been 15.6 km yr -1 . Reproduction by seeds is rarely reported but vegetative reproduction is very important in spread and colonization. In the fall, turions separate from the plant, sinking to the bottom where they overwinter. In the spring, these turions grow into small floating rosettes. Extremely rapid stoloniferous growth during the summer months results in the formation of large masses of interlocking plants that diminish native submerged aquatic plant communities by reducing available light. It is also of importance in limiting water flow in irrigation systems and restricting water traffic, thereby hindering recreational activity. Management has been largely mechanical. Hydrocharis morsus-ranae is a food plant for several water birds, rodents, fish and insects.

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“…No infra-specific taxa have been described and Cook and Lüönd (1982), in their comprehensive taxonomic monograph, did not highlight variation within this species. attention.…”

Section: Namementioning

confidence: 93%

Section: Namementioning

confidence: 99%

Section: Namementioning

confidence: 99%

Section: Namementioning

confidence: 99%

Section: Namementioning

confidence: 99%

See 3 more Smart Citations

The biology of Canadian weeds. 124. Hydrocharis morsus-ranae L.

Catling¹,

Mitrow²,

Haber³

et al. 2003

Can. J. Plant Sci.

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Data‐centric species distribution modeling: Impacts of modeler decisions in a case study of invasive European frog‐bit

Hansen,

Monfils,

Hackett

et al. 2024

Appl Plant Sci

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PremiseSpecies distribution models (SDMs) are widely utilized to guide conservation decisions. The complexity of available data and SDM methodologies necessitates considerations of how data are chosen and processed for modeling to enhance model accuracy and support biological interpretations and ecological applications.MethodsWe built SDMs for the invasive aquatic plant European frog‐bit using aggregated and field data that span multiple scales, data sources, and data types. We tested how model results were affected by five modeler decision points: the exclusion of (1) missing and (2) correlated data and the (3) scale (large‐scale aggregated data or systematic field data), (4) source (specimens or observations), and (5) type (presence‐background or presence‐absence) of occurrence data.ResultsDecisions about the exclusion of missing and correlated data, as well as the scale and type of occurrence data, significantly affected metrics of model performance. The source and type of occurrence data led to differences in the importance of specific explanatory variables as drivers of species distribution and predicted probability of suitable habitat.DiscussionOur findings relative to European frog‐bit illustrate how specific data selection and processing decisions can influence the outcomes and interpretation of SDMs. Data‐centric protocols that incorporate data exploration into model building can help ensure models are reproducible and can be accurately interpreted in light of biological questions.

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Floral Development of Hydrocharis Morsus‐ranae (Hydrocharitaceae)

Scribailo

Posluszny

1985

American J of Botany

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In both male and female flowers of H. morsus‐ranae the primordia of the floral appendages appear in an acropetal succession consisting of alternating trimerous whorls. In the male flower a whorl of sepals is followed by a whorl of petals, three whorls of stamens, and a whorl of filamentous staminodes. The mature androecial arrangement therefore consists of two antisepalous stamen whorls, an antipetalous whorl of stamens, and antipetalous staminodes. Shortly before anthesis, basal meristematic upgrowth between filaments of adjacent whorls produces paired stamens, joining Whorls 1 and 3, and Whorl 2 with the staminodial whorl. A central domelike structure develops between the closely appressed filaments of the inner stamen and staminodial whorl, giving the structure a lobed appearance. After petal inception in the female flower a whorl of antisepalous staminodes develop, each of which may bifurcate to form a pair of staminodes. During staminode development a girdling primordium arises by upgrowth at the periphery of the floral apex. The girdling primordium rapidly forms six gynoecial primordia, which then go on to produce six free styles with bifid stigmas. Intercalary meristem activity, below the point of floral appendage attachment, leads to the production of a syncarpous inferior ovary with six parietal placentae. The styles and carpels remain open along their ventral sutures. During the final stages of female floral development, several hundred ovules develop along the carpel walls, and three nectaries develop dorsally and basally on the three antipetalous styles.

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A revision of the genus Hydrocharis (hydrocharitaceae)

Cited by 45 publications

References 32 publications

The biology of Canadian weeds. 124. Hydrocharis morsus-ranae L.

The biology of Canadian weeds. 124. Hydrocharis morsus-ranae L.

Data‐centric species distribution modeling: Impacts of modeler decisions in a case study of invasive European frog‐bit

Floral Development of Hydrocharis Morsus‐ranae (Hydrocharitaceae)

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