The open plant encyclopedia
Snap a photo or search by any name to see how to care for it, where it comes from, whether it's safe, and a 3D model you can turn.
The plants people record most in your country, and ones that grow there wild.
Filter by what you want to do, shape, origin, country, care and safety.
Calycadenia truncata
Also called Rosin Weed
Oregon western rosinweed is a native annual herb of southwestern Oregon and northern and central California, growing up to about 120 cm tall with sticky resin glands on its flower bracts. It is a wildflower of dry open ground, best grown from seed in full sun with little water.
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 is an annual herb producing an erect, reddish stem, reaching up to 120 centimetres (47 inches) in height. 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) 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. The fruit is an achene.
Fremont's western rosinweed · Hoover's western rosinweed · Small-flowered calycadenia · Soft western rosinweed · Sticky western rosinweed · Butte County western rosinweed · Smallflower western rosinweed · Spiked western rosinweed · Dwarf western rosinweed · Western rosinweed
Text excerpted from the Wikipedia article Calycadenia truncata by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.
The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
