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Rosinweed Calycadenia truncata


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credit: Ken-ichi Ueda/CCSA

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Alternate name: Oregon Western Rosinweed

Family: Asteraceae, Aster view all from this family

Description A slender, odorous plant with yellow flower heads in a narrow cluster and very narrow leaves; each upper leaf tipped with a broad, dish-shaped resin gland.
Habit: annual perennial herb; erect reddish stem, usually branched.
Height: 8-48 in (20-120 cm)
Leaf: alternate, linear, 1-4 in (2-10 cm) long.
Flower: yellow, 1 in (25 mm) wide; with 3-8 rays, wide, roughly triangular, 3 lobes at end, middle lobe smaller, sometimes with red "eye" at base; around large open-centered disk florets.

Flower June to October.

Habitat Dry, sunny, sparsely grassy hillsides, rocky ridges, talus; 160-5000 ft (50-1500 m).

Range California and Oregon: Coast Range from Jackson and Josephine counties in southwestern Oregon to San Luis Obispo County, California; Sierra Nevada foothills south to Fresno County; also localized in the Sacramento Valley.

Discussion Also known as: Oregon western rosinweed, smooth tackweed. Three varieties are recognized sepearate to the species. The genus name comes from the Greek kalyx (cup) and adenos (gland), referring to the peculiar glands that distinguish all but one species of this genus found primarily in California. Rays on some species are white, changing to rose as they age.