Mexican Floss Flower

Names and Synonyms

Common Names

• Flossflower
• Mexican ageratum
• blue billygoat-weed
• bluemink
• Garden Ageratum
• Hawaii Blue
• blue billygoat weed
• cotton floss

Scientific Names

Accepted name

Synonyms

• Ageratum conyzoides var. houstonianum
• Ageratum conyzoides var. mexicanum
• Ageratum mexicanum
• Ageratum wendlandii
• Carelia houstoniana
• Ageratum pinetorum
• Ageratum houstonianum var. angustatum
• Ageratum houstonianum var. muticescens
• Ageratum mexicanum var. majus
• Ageratum mexicanum var. wendlandii
• Ageratum houstonianum f. luteum
• Ageratum houstonianum f. isochroum
• Ageratum mexicanum album
• Ageratum mexicanum var. nanum
• Ageratum mexicanum rubrum
• Cacalia mentrasto
• Ageratum conyzoides subsp. houstonianum
• Ageratum houstonianum f. niveum
• Ageratum houstonianum f. versicolor
• Alomia pinetorum

Regional and Traditional Names

Sources: Wikidata, Catalogue of Life

Taxonomical Classification

This plant, Ageratum houstonianum, belongs to the kingdom Plantae and the phylum Streptophyta. It is further classified under the class Equisetopsida and subclass Magnoliidae within the order Asterales. Finally, it is a member of the family Asteraceae and falls under the genus Ageratum.

Sources: The World Checklist of Vascular Plants (WCVP)

Distribution

This plant exhibits a broad distribution across several European regions. In Northern Europe, its presence is noted within Great Britain. Moving into Middle Europe, it can be found growing in Belgium. The species also inhabits various territories across Germany and Hungary. Finally, its geographical range extends into Poland, completing its distribution across these central areas.

Sources: The World Checklist of Vascular Plants (WCVP)

Botanical Identification

Ecology

The ecology of Ageratum houstonianum is characterized by its ability to thrive across a broad altitudinal spectrum, ranging from sea level up to a maximum elevation of 2625 m AMSL. It maintains a mean elevational presence at approximately 1675 m AMSL, indicating a strong adaptability to varying mountain gradients. In terms of environmental setting, the species is frequently found inhabiting forest ecosystems, where it integrates into the local vegetative structure.

Elevational range max:

2625 m AMSL

Elevational range mean:

1675 m AMSL

Elevational range min:

0 m AMSL

Habitat :

forest

Genetics

The genetics of Ageratum houstonianum are characterized by a complex chromosomal makeup that facilitates its adaptability and evolutionary potential. Specifically, the species exhibits varying ploidy levels, with observed chromosome numbers of 20 and 40. This presence of both diploid and tetraploid states suggests a polyploid nature within the species, which often contributes to enhanced vigor, larger floral structures, and increased resilience to environmental stressors. Such chromosomal variation plays a critical role in the plant's genetic diversity and its capacity for hybridization and rapid adaptation across different ecological niches.

Chromosome number :

20, 40

Life history

The life history of Ageratum houstonianum is characterized by its classification as an annual plant, meaning it completes its entire biological cycle—from germination and vegetative growth to flowering and seed production—within a single growing season. As a therophyte, its survival strategy relies on completing its life cycle rapidly and producing a large quantity of seeds that remain dormant in the soil to ensure the continuation of the species after the parent plant dies. This life form allows the species to effectively colonize disturbed habitats and exploit seasonal resources before the onset of unfavorable environmental conditions.

Life form :

therophyte

Lifecycle :

annual

Morphology

The morphology of Ageratum houstonianum is characterized by its growth form as a non-woody herb and forb. The plant typically exhibits an erect shoot orientation and is a self-supporting species rather than a climber or vine. It functions as an independent organism, lacking parasitic tendencies, and is classified as a terrestrial plant rather than an aquatic or epiphytic one. In terms of stature, the plant's height is variable, with a minimum recorded height of 0.15 m, a maximum of 1 m, and a mean height of approximately 0.525 m.

Aquatic :

terrestrial

Climber :

self-supporting

Epiphyte :

terrestrial

Growth form :

herb

Growth form :

forb

Parasite :

independent

Plant height max:

1 m

Plant height mean:

0.525 m

Plant height min:

0.15 m

Shoot orientation :

erect

Woodiness :

non-woody

Physiology

The physiology of Ageratum houstonianum is characterized by a C3 photosynthetic pathway, which dictates its carbon fixation processes and environmental adaptation strategies. The plant's vegetative structure features orbicular leaf forms that vary significantly in dimension; the leaves typically exhibit a mean length of 4 cm, ranging from a minimum of 2 cm to a maximum of 7 cm, while the width maintains a mean of 2.5 cm, oscillating between a minimum of 1.5 cm and a maximum of 6 cm. Furthermore, this species does not function as a nitrogen fixer, meaning it relies on external soil nutrient availability rather than symbiotic nitrogen-fixing bacteria to meet its nitrogen requirements.

Leaf form :

orbicular

Leaf length max:

7 cm

Leaf length mean:

4 cm

Leaf length min:

2 cm

Leaf width max:

6 cm

Leaf width mean:

2.5 cm

Leaf width min:

1.5 cm

Nitrogen fixer :

no

Photosynthetic pathway :

C3

Reproduction

The reproduction of Ageratum houstonianum is characterized by a flowering period that typically begins in January and concludes in April, though the timing can be variable. The plant produces blue flowers arranged in a raceme inflorescence, which are serviced through biotic pollination syndromes, specifically involving insects such as butterflies. Following successful pollination, the plant develops fruit in the form of an achene. These fruits are indehiscent, with a mean length of 0.18 cm, ranging from a minimum of 0.15 cm to a maximum of 0.17 cm. The resulting seeds are extremely lightweight, possessing a mean mass of 0.000125 g, with values ranging from a minimum of 0.0001 g to a maximum of 0.00014 g. Dispersal of these seeds occurs through both unspecialized methods and anthropochory, facilitating the spread of the species.

Dehiscence :

indehiscent

Dispersal syndrome :

unspecialized

Dispersal syndrome :

anthropochorous

Flower colour :

blue

Flowering time :

Jan

Flowering time :

Apr

Fruit length max:

0.17 cm

Fruit length mean:

0.18 cm

Fruit length min:

0.15 cm

Fruit type :

achene

Inflorescence :

raceme

Pollination syndrome :

insect

Pollination syndrome :

butterfly

Pollination syndrome :

biotic

Seed mass max:

0.00014 g

Seed mass mean:

0.000125 g

Seed mass min:

1e-04 g

Sources: Global Inventory of Floras and Traits (GIFT)

Chemicals

Ageratum houstonianum has 11 reported phytochemicals identified across 0 scientific publications and several other databases. The most consistently reported chemicals include Caryophyllene oxide, ETHYL ACETATE, HEXANE, Isolongifolene, Linoleic.

Caryophyllene oxide

1. Pesticide biochemistry and physiology

ETHYL ACETATE

1. Parasitology research

HEXANE

1. Parasitology research

Isolongifolene

1. Pesticide biochemistry and physiology

Linoleic

1. Scientific reports

Phytol

1. Scientific reports

Precocene I

1. Scientific reports

Precocene II

1. Scientific reports

methanol

1. Parasitology research

oleic acid

1. Scientific reports

Activities

Ageratum houstonianum has 4 reported activities identified across 0 scientific publications and several other databases. The most consistently reported activities include Repellent, Antifeedant, Antioxidant, Cytotoxic.

Repellent

1. Scientific reports
2. Pesticide biochemistry and physiology

Antifeedant

1. Scientific reports

Antioxidant

1. Applied biochemistry and biotechnology

Cytotoxic

1. Applied biochemistry and biotechnology

Medicinal Uses

Ageratum houstonianum has 2 reported medicinal uses identified across 0 scientific publications and several other databases. The most consistently reported uses include pancreatitis, tonsillitis.

Most Reported Uses

Preparations