water caltrop

Names and Synonyms

Common Names

• European water chestnut
• water chestnut
• Water Caltrop
• European water-chestnut
• Jesuit's-nut
• bullnut
• horn-nut
• lingnut
• singhara-nut
• water-chestnut
• water nut
• water-caltrop

Scientific Names

Accepted name

Regional and Traditional Names

Sources: Wikidata, Catalogue of Life

Taxonomical Classification

This plant, known scientifically as Trapa natans, belongs to the kingdom Plantae and the phylum Streptophyta. Within the class Equisetopsida and subclass Magnoliidae, it is classified under the order Myrtales and the family Lythraceae. Ultimately, it is identified by its specific genus, Trapa.

Sources: The World Checklist of Vascular Plants (WCVP)

Distribution

This plant exhibits a broad distribution across several regions of the European continent. In Northern Europe, its presence can be observed in the country of Sweden. Moving into Middle Europe, it is found within the borders of Austria and Germany. The species also inhabits the territories of both Czechia and Slovakia. Finally, its geographical range extends further south into Hungary.

Sources: The World Checklist of Vascular Plants (WCVP)

Botanical Identification

Ecology

The ecology of Trapa natans is defined by its preference for freshwater habitats, where it thrives as a floating-leaved aquatic macrophyte in lakes, ponds, and slow-moving rivers. This species occupies a specific vertical niche within its ecosystem, maintaining an elevational range that spans from a minimum of 6 m AMSL to a maximum of 1030 m AMSL. It typically establishes itself in nutrient-rich, stagnant, or lentic waters, utilizing its rosette of floating leaves to capture sunlight at the water's surface while anchoring its roots in the submerged substrate. This positioning allows it to influence the local aquatic environment by altering light penetration and oxygen levels within the water column, thereby shaping the community structure of both flora and fauna in its immediate vicinity.

Elevational range max:

1030 m AMSL

Elevational range min:

6 m AMSL

Life history

The life history of Trapa natans is characterized by an annual lifecycle, where the plant completes its developmental stages within a single growing season. As a specialized hydrophyte, it is adapted to aquatic environments, utilizing floating leaves to capture sunlight while remaining anchored to the substrate. The species exhibits a deciduous nature, with its foliage and vegetative structures typically dying back at the conclusion of the growing season. Furthermore, its biological classification as a cryptophyte reflects its survival strategy, where essential parts of the plant are protected or dormant during unfavorable periods to ensure regrowth in subsequent cycles.

Deciduousness :

deciduous

Life form :

hydrophyte

Life form :

cryptophyte

Lifecycle :

annual

Morphology

The morphology of Trapa natans is characterized by its growth form as a non-woody herb and forb, functioning as an independent organism rather than a parasite. As an aquatic plant, it exhibits a self-supporting structure that does not rely on climbing mechanisms such as lianas or vines, and it maintains a terrestrial status regarding its epiphytic classification. The plant's physical dimensions vary, with a recorded minimum height of 0.5 m, a maximum height of 2 m, and a mean height of 0.02 m, reflecting its specialized adaptation to its aquatic environment.

Aquatic :

aquatic

Climber :

self-supporting

Epiphyte :

terrestrial

Growth form :

herb

Growth form :

forb

Parasite :

independent

Plant height max:

2 m

Plant height mean:

0.02 m

Plant height min:

0.5 m

Woodiness :

non-woody

Physiology

The physiology of Trapa natans is characterized by a C3 photosynthetic pathway, which governs its carbon fixation processes. The plant exhibits specific morphological adaptations related to its leaf development, maintaining a mean leaf size of 9.19 cm². Furthermore, its leaf structure is defined by a mean Specific Leaf Area (SLA) of 147.65 cm²/g, reflecting its resource allocation and leaf mass per area. In terms of nutrient cycling and metabolic capabilities, Trapa natans is not a nitrogen fixer, relying instead on the uptake of available nitrogen from its aquatic environment.

Leaf size mean:

9.19 cm²

Nitrogen fixer :

no

Photosynthetic pathway :

C3

Specific Leaf Area (SLA) mean:

147.65 cm²/g

Reproduction

The reproduction of Trapa natans is characterized by a specific seasonal flowering cycle and specialized fruit development. The flowering period typically commences in July and concludes in September. During this reproductive phase, the plant exhibits the capacity for self-fertilization, ensuring seed production. The resulting fruit is classified as an achene, which is notably indehiscent, meaning it does not split open at maturity to release its contents. Each seed produced has a consistent mass, with both the minimum, maximum, and mean values recorded at 0.834 g. Following maturation, the plant utilizes a hydrochorous dispersal syndrome, relying on water currents to transport its seeds to new locations.

Dehiscence :

indehiscent

Dispersal syndrome :

hydrochorous

Flowering time :

Jul

Flowering time :

Sep

Fruit type :

achene

Seed mass mean:

0.834 g

Self fertilization :

present

Sources: Global Inventory of Floras and Traits (GIFT)

Chemicals

Trapa natans has 7 reported phytochemicals identified across 0 scientific publications and several other databases. The most consistently reported chemicals include DIETHYL PHTHALATE, Hexadecanoic acid, ISOPROPYL PALMITATE, Octadecanoic acid, Palmitinic acid.

DIETHYL PHTHALATE

1. Zhong yao cai = Zhongyaocai = Journal of Chinese medicinal materials

Hexadecanoic acid

1. Zhong yao cai = Zhongyaocai = Journal of Chinese medicinal materials

ISOPROPYL PALMITATE

1. Zhong yao cai = Zhongyaocai = Journal of Chinese medicinal materials

Octadecanoic acid

1. Zhong yao cai = Zhongyaocai = Journal of Chinese medicinal materials

Palmitinic acid

1. Zhongguo Zhong yao za zhi = Zhongguo zhongyao zazhi = China journal of Chinese materia medica

Z-11

1. Zhong yao cai = Zhongyaocai = Journal of Chinese medicinal materials

acetamide

1. Zhong yao cai = Zhongyaocai = Journal of Chinese medicinal materials

Preparations

Trapa natans has 1 reported preparations identified across 0 scientific publications and several other databases. The most consistently reported preparations include eaten like chestnuts.

Eaten like chestnuts

1. Plants (Basel, Switzerland)