Stinknet

Oncosiphon pilulifer

"Oncosiphon pilulifer", also known as globe chamomile and stinknet, is a flowering plant in the daisy family native to South Africa and Lesotho. It is considered invasive in some parts of North America.
Stinknet or globe chamomile or Oncosiphon piluliferum This is an invasive plant from South Africa that landed in California about 1981. It has a strong smell and even goats don't want to eat it.
In January 2024 this plant was indicated as a noxious weed in Arizona. It has taken over many places that use to be the habitat of natural wildflowers in Arizona. This causes stress on the native pollinator animals that rely upon the native plants for pollen and food.
When they dry up in the summer it creates large quantities of tinder that allows wildfires to increase in intensity and frequency. Those fires are devastating to native plants like the iconic Saguaro.

f/16, 0.75x, 1/25 sec, ISO 200, 13 steps at 2.7mm/step
https://www.jungledragon.com/image/159136/stinknet_or_globe_chamomile_or_oncosiphon_piluliferum.html
 Geotagged,Oncosiphon pilulifer,United States

Appearance

Globe chamomile is a straggly, branching annual plant with a strong smell, growing up to 2 ft tall. The bipinnate or tripinnate leaves have a fleshy midrib which widens at the base. The globular flowers are borne in paniculate flower heads. There are no ray florets and the disc florets are yellow.
Stinknet or globe chamomile or Oncosiphon piluliferum 3.5X, 85 steps with 52 microns per step Geotagged,Oncosiphon pilulifer,Stinknet,United States

Naming

Synonyms include "Matricaria globifera" because it was previously in the "Matricaria" genus, and "Pentzia globifera", named for 18th century Swedish botanist Carolus Johannes Pentz.

The common name "stinknet" reflects the plant's strong odor.

Status

Globe chamomile is a species of "least concern" in South Africa.

Habitat

Globe chamomile is native to South Africa and Lesotho. It is also found in the Australian states of Victoria and Western Australia.

In North America, globe chamomile grows from seed in November to January when it begins flowering and setting new seeds. With sufficient moisture, three generations can grow by April. Wind-borne seed transportation spreads the plant which takes root in sunny, disturbed soil in natural and cultivated areas. Plants can cause skin irritation or allergic reaction through contact with the plant or inhalation of its pollen.

A single plant can contain up to 4000 flower balls, each ball being made up of hundreds of flowers.

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Taxonomy
KingdomPlantae
DivisionAngiosperms
ClassEudicots
OrderAsterales
FamilyAsteraceae
GenusOncosiphon
SpeciesO. pilulifer