bitter sow-thistle

Names and Synonyms

Common Names

• bitter sow-thistle

Scientific Names

Accepted name

Synonyms

• Sonchus wightianus subsp. wallichianus
• Sonchus lachnocephalus
• Sonchus lingianus
• Sonchus picris
• Sonchus wallichianus

Sources: Wikidata, Catalogue of Life

Taxonomical Classification

This plant belongs to the kingdom Plantae within the phylum Streptophyta and the class Equisetopsida. Classified under the subclass Magnoliidae and the order Asterales, it is a member of the family Asteraceae. Specifically, it is identified by the genus Sonchus as Sonchus wightianus.

Sources: The World Checklist of Vascular Plants (WCVP)

Distribution

This plant exhibits a diverse geographical range spanning several distinct regions across Asia. In Western Asia, its presence is specifically noted within the borders of Afghanistan. The species also has an extensive distribution throughout various parts of China. Its reach includes the southern reaches of Hainan and the North-Central regions of the country. Additionally, it can be found in both the Inner Mongolia region and the South-Central areas of China.

Sources: The World Checklist of Vascular Plants (WCVP)

Botanical Identification

Ecology

The ecology of Sonchus wightianus is characterized by a broad altitudinal distribution, allowing it to inhabit a diverse range of montane and lowland environments. It is found across a significant vertical gradient, with its presence recorded at elevations as low as 50 m AMSL and extending up to a maximum of 2500 m AMSL. Throughout its natural range, the species maintains a mean elevation of approximately 1225 m AMSL, suggesting a preference for mid-elevation ecological zones while remaining highly adaptable to varying topographic pressures and climatic shifts across its expansive altitudinal spectrum.

Elevational range max:

2500 m AMSL

Elevational range mean:

1225 m AMSL

Elevational range min:

50 m AMSL

Life history

The life history of Sonchus wightianus is characterized by an annual lifecycle, meaning the plant completes its entire developmental process—from germination to seed production—within a single growing season. Following the dispersal of seeds, the plant emerges and focuses its energy on vegetative growth, establishing a structural foundation suitable for its specific environmental niche. As the season progresses, it transitions into a reproductive phase, developing inflorescences to facilitate flowering. Once pollination is successful, the plant directs its remaining resources toward the maturation of seeds, ensuring the continuity of the species before the individual plant expires at the end of its annual cycle.

Lifecycle :

annual

Morphology

The morphology of Sonchus wightianus is characterized by a growth form classified as a herb, specifically appearing as a non-woody forb. The plant is a self-supporting organism that does not exhibit climbing habits, functioning as an independent species without parasitic tendencies. In terms of its ecological habit, it is a terrestrial plant, rather than being aquatic, semiaquatic, or epiphytic. Its physical structure is defined by its non-woody nature, maintaining a herbaceous consistency throughout its development.

Aquatic :

terrestrial

Climber :

self-supporting

Epiphyte :

terrestrial

Growth form :

herb

Parasite :

independent

Woodiness :

non-woody

Reproduction

The reproduction of Sonchus wightianus is characterized by the production of specialized fruit structures that facilitate its dispersal and propagation. The resulting fruit exhibits highly consistent morphological dimensions, with a measured fruit length that remains uniform across different samples. Specifically, the fruit length maintains a constant value of 0.3 cm, as evidenced by a minimum, mean, and maximum length all measuring exactly 0.3 cm. This uniformity in fruit size suggests a highly stabilized reproductive output within the species, ensuring that the dispersal units are standardized for optimal survival and germination in its natural habitat.

Fruit length max:

0.3 cm

Sources: Global Inventory of Floras and Traits (GIFT)

Chemicals

Sonchus wightianus has 1 reported phytochemicals identified across 0 scientific publications and several other databases. The most consistently reported chemicals include Cytochalasin.

Cytochalasin

1. Chemistry & biodiversity