camphorweed

Names and Synonyms

Common Names

• Camphorweed
• camphor daisy

Scientific Names

Accepted name

Synonyms

• Diplopappus scaber
• Heterotheca scabra var. calycium
• Heterotheca scabra var. nuda
• Calycium divaricatum
• Heterotheca subaxillaris var. procumbens
• Calycium scabrum
• Heterotheca chrysopsidis
• Heterotheca lamarckii
• Heterotheca scabra
• Inula subaxillaris
• Heterotheca latifolia
• Heterotheca latifolia var. arkansana
• Heterotheca latifolia var. macgregoris
• Heterotheca psammophila
• Heterotheca subaxillaris var. latifolia
• Heterotheca subaxillaris var. petiolaris
• Heterotheca subaxillaris var. psammophila
• Heterotheca subaxillaris subsp. latifolia
• Stelmanis scabra

Regional and Traditional Names

Sources: Wikidata, Catalogue of Life

Taxonomical Classification

This plant belongs to the kingdom Plantae and is classified under the phylum Streptophyta and class Equisetopsida. Within the subclass Magnoliidae, it falls under the order Asterales and the family Asteraceae. Finally, it is identified by its genus, Heterotheca.

Sources: The World Checklist of Vascular Plants (WCVP)

Distribution

This plant exhibits a diverse geographical distribution that spans across multiple continents. In Western Asia, it can be found growing in Cyprus and Palestine. Moving to North America, its presence extends into the Northwestern United States, specifically within Colorado. The species also inhabits the North-Central United States, with documented occurrences in Illinois. Additionally, it is known to grow within the state of Iowa.

Sources: The World Checklist of Vascular Plants (WCVP)

Botanical Identification

Ecology

The ecology of Heterotheca subaxillaris is characterized by its adaptability to diverse topographical gradients, specifically thriving within an elevational range that extends from 0 m to a maximum of 1000 m AMSL. This wide vertical distribution suggests a capacity to colonize various microclimates, ranging from low-lying coastal or alluvial plains to mid-elevation slopes. By inhabiting these specific altitudinal zones, the species can exploit a variety of soil compositions and moisture regimes, allowing it to establish itself in open, disturbed, or sun-exposed habitats typical of its range. This ability to persist from sea level up to 1000 m AMSL underscores its resilience to varying atmospheric pressures and temperature fluctuations encountered across different elevations.

Elevational range max:

1000 m AMSL

Elevational range min:

0 m AMSL

Life history

The life history of Heterotheca subaxillaris is characterized by its status as an annual species, completing its entire biological cycle within a single growing season. Following seed germination, the plant undergoes a rapid developmental process that includes vegetative growth and the establishment of its structural form, leading to a reproductive phase where it produces flowers and seeds. This annual lifecycle allows the plant to exploit favorable environmental conditions quickly, ensuring that it can set seed and contribute to the soil seed bank before the onset of unfavorable seasonal changes. The transition from seedling to maturity is driven by seasonal cues, ultimately culminating in the dispersal of seeds that will remain dormant until the next favorable growing period.

Lifecycle :

annual

Morphology

The morphology of Heterotheca subaxillaris is characterized by its growth form as a non-woody herb and specifically a forb. It is a self-supporting plant that does not exhibit climbing habits, functioning neither as a liana nor a vine. In terms of its ecological positioning and habitat, the species is terrestrial rather than aquatic or epiphytic, and it grows as an independent organism without parasitic tendencies.

Aquatic :

terrestrial

Climber :

self-supporting

Epiphyte :

terrestrial

Growth form :

herb

Growth form :

forb

Parasite :

independent

Woodiness :

non-woody

Reproduction

The reproduction of Heterotheca subaxillaris is centered on the production of specialized seeds that exhibit specific mass characteristics essential for its dispersal and establishment. The seed mass within the population shows subtle variability, with a calculated mean mass of 0.0006203335 g. This biological metric ranges from a minimum seed mass of 0.00052 g to a maximum seed mass of 0.00073 g, reflecting the physiological range of reproductive output for the species. These small, lightweight seeds are characteristic of the Asteraceae family, facilitating effective dispersal mechanisms that allow the plant to colonize suitable habitats.

Seed mass max:

0.00073 g

Seed mass mean:

0.0006203335 g

Seed mass min:

0.00052 g

Sources: Global Inventory of Floras and Traits (GIFT)

Plant Parts

Heterotheca subaxillaris 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 leaf.

Leaf

1. Frontiers in pharmacology

Chemicals

Heterotheca subaxillaris has 2 reported phytochemicals identified across 1 scientific publications and several other databases. The most consistently reported chemicals include Terpenoids, fatty acid esters.

Terpenoids

1. Frontiers in pharmacology

fatty acid esters

1. Frontiers in pharmacology

Conditions

Heterotheca subaxillaris has 4 reported investigations on conditions identified across 1 scientific publications and several other databases. The most consistently reported conditions include Bacillus cereus, Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus.

Bacillus cereus

1. Frontiers in pharmacology

Escherichia coli

1. Frontiers in pharmacology

Pseudomonas aeruginosa

1. Frontiers in pharmacology

Staphylococcus aureus

1. Frontiers in pharmacology

Preparations

Heterotheca subaxillaris has 2 reported preparations identified across 1 scientific publications and several other databases. The most consistently reported preparations include Hexane extracts, essential oil.

Hexane extracts

1. Frontiers in pharmacology

Essential oil

1. Phytotherapy research : PTR