Osmadenia

Osmadenia is a genus of flowering plants in the daisy family. It contains the single species Osmadenia tenella, which is known by the common name false rosinweed.[2]

Osmadenia
Scientific classification
Kingdom:
Plantae
(unranked):
Angiosperms
(unranked):
Eudicots
(unranked):
Asterids
Order:
Asterales
Family:
Asteraceae
Genus:
Osmadenia

Species:
O. tenella
Binomial name
Osmadenia tenella
Nutt.
Synonyms[1]
  • Calycadenia tenella (Nutt.) Torr. & A.Gray
  • Hemizonia tenella (Nutt.) A.Gray

Distribution

Osmadenia tenella is native to the coastal plains and the hills and canyons of the Transverse Ranges in Southern California, and the Peninsular Ranges in Southern California and Baja California.[3]

It is an uncommon member of the flora in local habitats, such as the coastal sage and chaparral and montane chaparral and woodlands sub-ecoregions.

Description

Osmadenia tenella is a hairy, glandular, aromatic annual herb producing an erect stem approaching 40 centimeters (16 inches) in maximum height with threadlike branches. The linear leaves are alternately arranged, the largest low on the plant measuring up to 5 centimeters.[2]

The inflorescence is a cyme of several flower heads. Each head has 3 to 5 three-lobed ray florets which are white or pink-tinged and often have a pink spot, and several narrower disc florets.[2]

The fruit is an achene; those arising from disc florets have pappi.

See also

References
  1. The Plant List, Osmadenia tenella Nutt.
  2. Flora of North America: Osmadenia tenella
  3. Calflora taxon report, University of California, Osmadenia tenella Nutt., false rosinweed
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