Tailed-leaf Teacost

Names and Synonyms

Common Names

• Tailed-leaf Teacost
• Tailed-leaf isodon

Scientific Names

Accepted name

Synonyms

• Amethystanthus excisus
• Rabdosia umbrosa var. coreana
• Amethystanthus excisus f. albiflorus
• Amethystanthus excisus var. chiisanensis
• Stachys polygonatum
• Plectranthus excisus
• Isodon excisus f. albiflorus
• Rabdosia excisa
• Amethystanthus excisus var. coreanus
• Rabdosia excisa f. albiflora
• Rabdosia excisa var. chiisanensis

Sources: Wikidata, Catalogue of Life

Taxonomical Classification

This plant belongs to the kingdom Plantae and is classified within the phylum Streptophyta and the class Equisetopsida. As a member of the subclass Magnoliidae and the order Lamiales, it falls under the family Lamiaceae. Specifically, its taxonomic identity is defined by the genus Isodon.

Sources: The World Checklist of Vascular Plants (WCVP)

Distribution

This plant is native to several specific regions across East Asia. In the Russian Far East, it can be found growing in the Amur, Khabarovsk, and Primorye territories. Its range also extends significantly into China. Specifically, it is distributed throughout the Manchuria region and China North-Central. This combination of locations defines its natural geographical footprint.

Sources: The World Checklist of Vascular Plants (WCVP)

Botanical Identification

Ecology

The ecology of Isodon excisuus is characterized by its specialized preference for moist, well-drained environments typically found within forest ecosystems and in close proximity to rivers. It thrives in the transitional zones of riparian corridors, where the availability of consistent moisture meets the shaded, stable microclimates provided by woodland canopies. By occupying these riverine and forested habitats, the species benefits from the nutrient-rich alluvial soils and the complex structural diversity of the landscape, which supports its growth patterns and long-term survival within its natural range.

Habitat :

forest, rivers

Life history

The life history of Isodon excisuus is characterized by its status as a perennial organism, allowing it to persist through multiple growing seasons. In terms of its structural life form, the species is classified as a hemicryptophyte, a designation that describes its specific strategy for overwintering and growth patterns within its ecological niche.

Life form :

hemicryptophyte

Lifecycle :

perennial

Morphology

The morphology of Isodon excisus is characterized by its growth form as a herb, displaying a non-woody structure. This plant is a self-supporting species that does not function as a climber, maintaining an independent lifestyle without being a parasite. As a terrestrial plant, it grows in soil rather than as an epiphyte. In terms of stature, the plant is relatively small, with a height ranging from a minimum of 0.8 m to a maximum of 1 m.

Climber :

self-supporting

Epiphyte :

terrestrial

Growth form :

herb

Parasite :

independent

Plant height max:

1 m

Plant height min:

0.8 m

Woodiness :

non-woody

Reproduction

The reproduction of Isodon excisus is characterized by a specific seasonal flowering period that occurs during the mid-to-late summer months. The flowering process typically begins in July and reaches its conclusion in August. This relatively brief reproductive window suggests a synchronized blooming pattern within its natural habitat.

Flowering time :

Jul

Flowering time :

Aug

Sources: Global Inventory of Floras and Traits (GIFT)

Plant Parts

Isodon excisus has 1 reported plant parts identified across 1 scientific publications and several other databases that are studied for medicinal purposes. The most consistently reported plant part include stem.

Stem

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

Chemicals

Isodon excisus has 9 reported phytochemicals identified across 1 scientific publications and several other databases. The most consistently reported chemicals include EXCISANIN H, Inflexin, inflexanin A, inflexanin B, inflexarabdonin A.

EXCISANIN H

1. Journal of natural products

Inflexin

1. Journal of natural products

inflexanin A

1. Journal of natural products

inflexanin B

1. Journal of natural products

inflexarabdonin A

1. Journal of natural products

inflexarabdonin G

1. Journal of natural products

inflexarabdonin I

1. Journal of natural products

inflexinol

1. Journal of natural products

kamebakaurin

1. Journal of natural products

Preparations

Isodon excisus has 2 reported preparations identified across 1 scientific publications and several other databases. The most consistently reported preparations include Rabdosia excisa decoction, methanol extract of the aerial parts.

Rabdosia excisa decoction

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

Methanol extract of the aerial parts

1. Journal of natural products