Calycadenia truncata

Calycadenia truncata is a species of flowering plant in the family Asteraceae known by the common name Oregon western rosinweed. It is native to western North America.

Calycadenia truncata
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Calycadenia
Species:
C. truncata
Binomial name
Calycadenia truncata
Synonyms[1]
  • Calycadenia scabrella Greene
  • Calycadenia truncata var. scabrella (Drew) Jeps.
  • Calycadenia truncata subsp. scabrella (Drew) D.D.Keck
  • Hemizonia scabrella Drew
  • Hemizonia truncata (DC.) A.Gray
  • Lagophylla scabrella M.E.Jones

Calycadenia truncata is an annual herb producing an erect, reddish stem, reaching up to 120 centimetres (47 inches) in height.[2] The leaves are linear (long and very narrow) and up to 10 cm (4 in) long. Blooming from June to October, the inflorescence bears one or more flower heads about 2.5 cm (1 in)[2] at separate nodes, surrounded by short bracts tipped with resin glands. The hairy flower heads have a center of many purple-tipped disc florets as well a few yellow ray florets 6–13 millimetres (1⁄4–1⁄2 in) in length.[2] The fruit is an achene.[3]

It is native to southwestern Oregon and northern and central California. It is found in the Cascades, the Coast Ranges, and the foothills of the Sierra Nevada as far south as Monterey and Tulare Counties.[4][5] It thrives on dry and sunny grassy slopes.[2]

References
  1. The Plant List, Calycadenia truncata DC.
  2. Spellenberg, Richard (2001) [1979]. National Audubon Society Field Guide to North American Wildflowers: Western Region (rev ed.). Knopf. pp. 361–362. ISBN 978-0-375-40233-3.
  3. Flora of North America, Calycadenia truncata de Candolle in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 695. 1836.
  4. Biota of North America Program 2014 county distribution map
  5. Calflora taxon report, University of California, Calycadenia truncata DC., rosin weed


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