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Hydrocleys nymphoides. a, open flower; b, flower in profile; c, adult leaf adaxial surface; d, adult leaf abaxial surface; e, juvenile leaf adaxial surface; f, petiole and peduncle bracts; g, stolon with leaves and flowers clustered at node. Scale bars a, c-e = 20 mm; b = 15 mm; f = 10 mm. Images by R.W. Jobson (Audley Weir, N.S.W.).

Hydrocleys nymphoides. a, open flower; b, flower in profile; c, adult leaf adaxial surface; d, adult leaf abaxial surface; e, juvenile leaf adaxial surface; f, petiole and peduncle bracts; g, stolon with leaves and flowers clustered at node. Scale bars a, c-e = 20 mm; b = 15 mm; f = 10 mm. Images by R.W. Jobson (Audley Weir, N.S.W.).

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Hydrocleys nymphoides (Humb. & Bonpl. ex Willd.) Buchenau (Alismataceae) is a stoloniferous emergent/floating perennial aquatic plant native to the Neotropics. In Australia it is naturalised in Queensland, New South Wales, Victoria and the territory Norfolk Island. The earliest non-cultivated collection in New South Wales was made in November 1957...

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Context 1
... maroon. Staminodes flattened, awl-shaped, same colour as filaments. Carpels usually 6 (5-8 recorded in litt.), 11-13 mm long, free or fused basally; stigma purple. Fruit (not observed in Australian populations) a follicle c. 15 mm long including apical beak, splitting longitudinally to release several small horseshoe-shaped seeds to 1 mm long. Fig. 1. ...
Context 2
... (Aston and Jacobs 1980). In Australia it is naturalised in near-coastal localities in Queensland, central and eastern Victoria, and several scattered localities in New South Wales; also recorded for Norfolk Island. However, these species can be differentiated from H. nymphoides based on their lack of a spongy midrib on the abaxial leaf surface (Fig. 1d) and in Brasenia schreberi the petiole is attached at, and the veins radiate from, the lamina centre. Marshwort (Nymphoides Ség.) species differ from H. nymphoides in having palmately veined leaves. The usually submerged juvenile leaves of H. nymphoides (Fig. 1e) could be confused with adult leaves of some native Pondweed (Potamogeton ...
Context 3
... from H. nymphoides based on their lack of a spongy midrib on the abaxial leaf surface (Fig. 1d) and in Brasenia schreberi the petiole is attached at, and the veins radiate from, the lamina centre. Marshwort (Nymphoides Ség.) species differ from H. nymphoides in having palmately veined leaves. The usually submerged juvenile leaves of H. nymphoides (Fig. 1e) could be confused with adult leaves of some native Pondweed (Potamogeton L.) species; although the spongy abaxial midrib of the former enables them to be easily ...

Citations

... The species Hydrocleys nymphoides, Sagittaria montevidensis, and Alisma plantago-aquatica hold significant economic and ecological importance. Hydrocleys nymphoides, commonly known as the water poppy, is cultivated as an ornamental plant and has the potential to become an invasive weed in disturbed wetlands (Kodela & Jobson 2018;Silva et al. 2024). Sagittaria montevidensis, a native species with a high tolerance to heavy metals, can accumulate copper and nickel without showing signs of stress, enabling it to complete its phenological stages (Gomez et al. 2020). ...
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The Alismataceae family, widely distributed across tropical temperate swamps and wetlands, includes 15 genera post-merger with Limnocharitaceae. In Argentina, six genera are represented across three clades. Embryological characters, notably the male gametophyte and anther, are crucial in taxonomy due to their stability against environmental changes. This study aims to analyze the ultrastructure of the tapetum and pollen grain development in three economically and ecologically important species representing each clade: Sagittaria montevidensis (Clade A), Hydrocleys nymphoides (Clade B), and Alisma plantago-aquatica (Clade C). Anthers at different developmental stages were processed according to classic techniques for their observation with bright-field and transmission electron microscopy. The three studied species within the Alismataceae family exhibit similar reproductive characteristics. Seven stages of pollen grain development were identified. The microsporogenesis is successive with a regular meiosis. The ultrastructure of the tapetal cells shows similarities to other species with plasmodial tapetum. During the microspore tetrad stage, there is tapetal hyperactivity and an increase in secretion processes. In the free microspore stage, the tapetal cells lose their walls and increase the amount of rough endoplasmic reticulum forming a network of cisternae that extend into evaginations. Later cells completely invade the anther locule and fuse to form a tapetal plasmodium. No peritapetal membrane with orbicules was observed. Pollen is released at the tricellular stage. The pollen grain wall presents an ectexine with a basal layer, columellae, and tectum with supratectal spines while an endexine is not observed in any of the three species. This research enhances the understanding of tapetal cell interactions with developing pollen grains and contributes to the knowledge of the ultrastructure of plasmodial tapetum. Moreover, these findings highlight evolutionary reproductive patterns in Alismataceae, suggesting the plasmodial tapetum as a synapomorphy for the order.
... The plant, which is stoloniferous, can spread by fragments of its creeping stem, seedlings produced at the end of the growing season or seeds. Dispersal probably occurs by water currents, boats and machinery, waterfowl, and people (Kodela & Jobson 2018). ...
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Alismataceae is a family of aquatic or semi-aquatic plants with a wide distribution in humid areas, occurring in tropical, subtropical and temperate regions. Although Brazil accounts for 50% of the entire species diversity of this family, there are many gaps in knowledge of the species and their distribution, especially in the southern region of the country. This paper presents the study of Alismataceae species in the Biomes Pampa and Atlantic Forest of Rio Grande do Sul, highlighting taxonomic, ecological and distribution aspects. This study was based on the morphological analysis of specimens deposited in online data repositories and herbaria, as well as specimens collected in wetlands in the extreme south of Brazil. Ten taxa were registered for Rio Grande do Sul state: Echinodorus grandiflorus, E. longiscapus, E. macrophyllus, E. reptilis, E. uruguayensis, Helanthium tenellum, Hydrocleys nymphoides, Sagittaria lancifolia, S. rhombifolia and S. montevidensis. As a result of this study, an identification key for the taxa, morphological descriptions, images of the species and distribution maps are presented. Ecological and phenological data are also provided.