Drooping thumba

Names and Synonyms

Common Names

• Drooping thumba

Scientific Names

Accepted name

Synonyms

• Leucas decurva
• Phlomis nutans

Sources: Wikidata, Catalogue of Life

Taxonomical Classification

This plant belongs to the kingdom Plantae and the phylum Streptophyta, placing it within the class Equisetopsida and subclass Magnoliidae. It is further classified under the order Lamiales and the family Lamiaceae. Finally, the species is identified by its genus, Leucas.

Sources: The World Checklist of Vascular Plants (WCVP)

Distribution

This plant is widely distributed across various regions of the Indian Subcontinent. Specifically, it can be found growing in the countries of India, Pakistan, and Bangladesh. Its presence extends into the mountainous terrains of the West Himalaya. Furthermore, the geographical range reaches into the Indo-China region, particularly within Myanmar. This broad distribution highlights the adaptability of Leucas nutans across diverse Asian landscapes.

Sources: The World Checklist of Vascular Plants (WCVP)

Botanical Identification

Life history

The life history of Leucas nutans is characterized by an annual lifecycle, meaning it completes its entire developmental process from germination to seed production within a single growing season. In terms of its biological structure and survival strategy, the plant is classified as a therophyte, a life form where the plant survives the unfavorable season as a seed, allowing it to quickly emerge and flourish when environmental conditions become optimal.

Life form :

therophyte

Lifecycle :

annual

Morphology

The morphology of Leucas nutans is characterized by its growth form as a non-woody herb. It functions as an independent organism, meaning it is not a parasite, and it maintains a terrestrial lifestyle rather than being an epiphyte. While it exhibits a climbing habit, it is specifically classified as a self-supporting climber, lacking the need for external structures for its primary vertical orientation.

Climber :

self-supporting

Epiphyte :

terrestrial

Growth form :

herb

Parasite :

independent

Woodiness :

non-woody

Reproduction

Reproduction in Leucas nutans is primarily driven by the production of specialized seeds that facilitate its dispersal and colonization of various habitats. The reproductive success of this species is characterized by a highly consistent seed morphology, with data indicating a uniform seed mass across the population. Specifically, the seed mass exhibits a constant value with a mean, maximum, and minimum of 0.0026 g. This lack of variance in seed mass suggests a highly stabilized reproductive strategy, ensuring that each seed carries a specific, standardized amount of nutrient reserves to support early seedling establishment. Through this precise seed production, the plant effectively manages its life cycle and ensures the continuity of its lineage within its ecological niche.

Seed mass mean:

0.0026 g

Sources: Global Inventory of Floras and Traits (GIFT)

Chemicals

Leucas nutans has 4 reported phytochemicals identified across 0 scientific publications and several other databases. The most consistently reported chemicals include Leucasin, Lupeol palmitate, STIGMASTEROL, Sitosterol.

Leucasin

1. Phytochemistry

Lupeol palmitate

1. Phytochemistry

STIGMASTEROL

1. Phytochemistry

Sitosterol

1. Phytochemistry