silver horehound

Names and Synonyms

Common Names

• Silver Horehound

Scientific Names

Accepted name

Sources: Wikidata, Catalogue of Life

Taxonomical Classification

This plant belongs to the kingdom Plantae and the phylum Streptophyta within the class Equisetopsida. It is further classified under the subclass Magnoliidae and the order Lamiales, falling into the family Lamiaceae. Ultimately, it is identified by the genus Marrubium.

Sources: The World Checklist of Vascular Plants (WCVP)

Distribution

This plant exhibits a diverse geographical range across several distinct regions of the European continent. In Middle Europe, its presence can be specifically noted in Germany. Moving toward the Mediterranean, it is found in Southwestern Europe, particularly on the island of Sardegna. The species also extends into Southeastern Europe, where it inhabits territories such as Albania and Bulgaria. Additionally, its distribution reaches into the Southeastern European landscapes of Italy.

Sources: The World Checklist of Vascular Plants (WCVP)

Botanical Identification

Life history

The life history of Marrubium incanum is characterized by its status as a perennial species, allowing it to persist across multiple growing seasons. In terms of its structural growth strategy and survival mechanisms, the plant is classified as a hemicryptophyte, meaning its perennating buds are located at the soil surface, protected by the leaf litter or the substrate. This life form, identified through both its hemicryptophyte classification and its specific role within various ecological niches, enables the plant to endure seasonal environmental fluctuations while maintaining its regenerative capacity through its specialized bud placement.

Life form :

hemicryptophyte

Lifecycle :

perennial

Morphology

The morphology of Marrubium incanum is characterized by its growth habit as a non-woody, herbaceous plant. It does not function as a climber, lacking any self-supporting climbing mechanisms, and it exists as an independent organism rather than a parasite. Furthermore, it is a terrestrial plant, meaning it grows in the soil and does not exhibit epiphytic behavior.

Climber :

self-supporting

Epiphyte :

terrestrial

Parasite :

independent

Woodiness :

non-woody

Physiology

The physiology of Marrubium incanum is characterized by a standard C3 photosynthetic pathway, a mechanism where carbon fixation occurs directly through the Calvin cycle without the spatial or temporal separation seen in C4 or CAM plants. This metabolic strategy dictates the plant's water-use efficiency and environmental adaptations, as it relies on the enzyme RuBisCO to fix atmospheric CO2, making the species particularly sensitive to photorespiration under high-temperature or arid conditions. To mitigate the physiological stress associated with its C3 metabolism in Mediterranean-type climates, the plant employs various adaptive mechanisms, including the regulation of stomatal conductance to balance gas exchange with transpiration rates. Additionally, its physiological processes include the synthesis and storage of secondary metabolites, such as terpenoids and flavonoids, which play a crucial role in protecting the plant's cellular structures from oxidative stress induced by intense solar radiation.

Photosynthetic pathway :

C3

Reproduction

The reproduction of Marrubium incanum is characterized by a versatile dispersal strategy that utilizes multiple environmental vectors to ensure the propagation of its species. The plant exhibits a complex dispersal syndrome that is primarily classified as zoochorous, though it functions through an unspecialized approach that incorporates various modes of movement. Specifically, its dispersal mechanisms encompass anemochorous, autochorous, and hydrochorous processes, allowing seeds to be spread by wind, self-dispersal, and water. Furthermore, the reproductive success of Marrubium incanum is heavily supported by zoochorous interactions, which include both endozoochorous and epizoochorous methods, as well as anthropochorous and myrmecochorous pathways, indicating that the seeds are distributed through ingestion by animals, attachment to external surfaces, human activity, and movement by ants.

Dispersal syndrome :

zoochorous

Sources: Global Inventory of Floras and Traits (GIFT)

Chemicals

Marrubium incanum has 5 reported phytochemicals identified across 0 scientific publications and several other databases. The most consistently reported chemicals include Salvigenin, STIGMASTEROL, Samioside, Verbascoside, palmitic acid.

Salvigenin

1. Molecules (Basel, Switzerland)
2. Pharmaceutical biology

STIGMASTEROL

1. Molecules (Basel, Switzerland)

Samioside

1. Molecules (Basel, Switzerland)

Verbascoside

1. Molecules (Basel, Switzerland)

palmitic acid

1. Molecules (Basel, Switzerland)