Lemons Rubberweed

Kingdom Order Family Genus Species
Plantae Asterales Asteraceae Hymenoxys Hymenoxys lemmonii

  • Plant Type: Biennial, Perennial herb.
  • Common Names: Lemon’s Rubberweed, Lemon’s Bitterweed, Alkali Hymenoxys.
  • Color: Yellow
  • Flower Dimensions: 0.6 inches wide.
  • Flowering Seasons/Month: Summer (June to September).
  • Desert with Lemon’s Rubberweed: Great Basin.

Lemon’s Rubberweed Flower Characteristics

Lemon’s Rubberweed
Image Source: Flickr

Hymenoxys lemmonii is a perennial herb of the Asterceae family. The plant can grow to a height of 15-20 inches.

  • The leaves of the Lemon’s Rubberweed are straight and dark green. It measures 3.6 inches in length. The leaf blades are simple or lobed.
  • Hymenoxys lemmonii has one or more branches (3-10). Their stem is hairless.
  • The stem of the H. lemmonii is purple-red tinted proximally, or it can be green throughout.
  • Lemon’s Rubberweed flowers are Daisy-like. The flower has thick golden disk florets and shaggy golden ray florets.
Lemon's Rubberweed
Image Source: Wikimedia

Lemon’s Rubberweed Facts

Lemon's Rubberweed
Image Source: Wikimedia
  • The generic name Hymenoxys is from the Greek word “hymen” and “oxys“, which means “membrane” and “sharp” respectively.
  • The plants of the genus Hymenoxyscontain sesquiterpene lactone hymenoxon, which is toxic to sheep. H. lemmonii[1] is considered one of the poisonous plants in North America affecting sheep and goats.
  • Scientists[2] discovered sesquiterpene lactone aglycones and glycosides from the Hymenoxys lemmonii. It is listed as a poisonous plant[3].
  • In research[4] conducted, only the H. lemmonii has recovered enough in high severity burn areas to support the endemic butterflies.
  • The species name “lemmonii” was derived from John Gill Lemmon[5] (1832-1908). He was the husband of Sarah Plummer Lemmon, a famous American botanist. It is estimated that 3% of Arizona’s native plants were named by this couple.

Suggested Reading: Popular Flower Types

Cite This Page

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BioExplorer.net. (2022, December 04). Lemon’s Rubberweed. Bio Explorer. https://www.bioexplorer.net/plants/flowers/lemons-rubberweed/.
BioExplorer.net. "Lemon’s Rubberweed" Bio Explorer, 04 December 2022, https://www.bioexplorer.net/plants/flowers/lemons-rubberweed/.
BioExplorer.net. "Lemon’s Rubberweed" Bio Explorer, December 04 2022. https://www.bioexplorer.net/plants/flowers/lemons-rubberweed/.
Key References
  • [1]“Toxic Plants of North America – George E. Burrows, Ronald J. Tyrl – Google Mga aklat”. Accessed September 13, 2022. Link.
  • [2]“Sesquiterpene lactone aglycones and glycosides from Hymenoxys lemmonii – ScienceDirect”. Accessed September 13, 2022. Link.
  • [3]“Poisonous Plants: January 1984 – December 1991 – Carol Kopolow – Google Mga aklat”. Accessed September 13, 2022. Link.
  • [4]“Living on the Edge: Assessing the Effects of Catastrophic Fire on Plants Utilized by Two Endemic Subspecies of Spring Mountains Butterflies”. Accessed September 13, 2022. Link.
  • [5]“All Those Plants Named “Lemmonii” | Cochise County Master Gardeners”. Accessed September 13, 2022. Link.

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