Overview

Distribution

National Distribution

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Physical Description

Morphology

Description

Perennials (biennials?), 30–90 cm (caudices buttonlike, roots unbranched, fleshy-fibrous). Herbage loosely and sparsely arachnose to finely tomentose, unevenly glabrescent. Stems single. Leaves progressively reduced distally; petiolate; blades ovate or oblanceolate to oblong, 7–20 × 2–3 cm, bases broadly to narrowly tapered, margins repand-denticulate or sublaciniate to subentire (mid and distal leaves sessile, smaller, weakly clasping). Heads (6–)15–30+ in corymbiform arrays. Calyculi 0 or of 1–3+ oblong to linear bractlets (seldom more than 1.5 mm). Phyllaries ± 8 or ± 13, 4–8 mm, tips green or black. Ray florets 0 or 1–2; corolla laminae 4–7 mm. Cypselae glabrous. 2n = 40.
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Diagnostic Description

Synonym

Senecio leptolepis Greene; S. rawsonianus Greene
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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: G5 - Secure

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Wikipedia

Senecio aronicoides

Senecio aronicoides is a species of flowering plant in the aster family known by the common name rayless ragwort. It is native to Oregon and northern and central California, where it can be found in the woodlands and forests of mountains and foothills, often in relatively dry habitat. It is a biennial or perennial herb growing up to about 90 centimeters tall from a fleshy root attached to a buttonlike caudex. The plant is often slightly woolly or cobwebby in texture. The leaves have lance-shaped to oval blades measuring up to 20 centimeters long, the largest ones lower on the stem. The inflorescence is a corymb which is flat and spreading, often resembling an umbel. The flower heads are cups lined with black- or green-tipped phyllaries and filled with many gold disc florets. There are usually no ray florets but one or two occasionally emerge from a head. The fruit is a hairless achene tipped with a pappus of long, white bristles.

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