Bulliarda aquatica (L.) DC.
Water pygmyweed
Bulliarda aquatica, now known as Crassula aquatica, is a small annual or biennial aquatic and semi-aquatic herb of almost cosmopolitan distribution in temperate zones. It grows on muddy margins of ponds, slow streams and freshwater intertidal areas. It is one of the most unusual succulent plants for its aquatic habitat, with opposite fleshy leaves and tiny four-petalled flowers.
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© Cavan Allen y Wesley Knapp
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Overview
| Category | Classification |
|---|---|
| Family | Crassulaceae |
| Genus | Bulliarda |
| Growth Habit | Prostrate to ascending annual or biennial, very delicate, with thin succulent stems; forms small mats in wet mud or partially submerged. |
| Conservation Status | Least Concern (LC) globally; declining in Europe due to loss of aquatic habitat. |
| pH Target | 5.5–7.5 |
| Type | Silt, mud, fine damp sand at freshwater margins. |
Origin & Habitat
Requirements
Soil & Substrate
Type
Silt, mud, fine damp sand at freshwater margins.
groups Beneficial Associations
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Propagation Strategy
M
A
Annual plant; renew each annual cycle.
No fertilisation needed; naturally nutrient-rich habitat water is sufficient. In cultivation, slightly enriched water with low-concentration aquatic nutrients.
Uses & Applications
Precautions / Toxicity
No known toxicity data; considered harmless.
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Plant Health
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"Type species of the historical genus Bulliarda DC. Its reclassification within Crassula reflects the close phylogenetic relationship among all small genera of Crassulaceae. In central Europe it is protected due to its rarity caused by wetland degradation."
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Scientific Integrity
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Sources
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Discussion
Disclaimer
This species record is provided for educational and informational purposes only. Jardín Roca Negra does not guarantee the accuracy or completeness of the data. Content is community-curated and may be subject to revision; it should not replace advice from a qualified botanist. This species may be toxic, invasive, or subject to legal restrictions — verify before handling or cultivating. Jardín Roca Negra accepts no liability for any harm arising from reliance on this information. Images are reproduced under Creative Commons or equivalent free licenses; credits are noted below each image.