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Arnica venosa
Hall
No occurrences found
Family:
Asteraceae
Shasta County arnica
Images
not available
FNA
Resources
Steven J. Wolf in Flora of North America (vol. 21)
Plants
20-60 cm.
Stems
simple or branched (prominently ribbed; caudices woody).
Leaves
6-10 pairs, cauline (basal leaves withered by flowering; proximal cauline scalelike, middle leaves largest, distal reduced, bractlike) usually broadly sessile, rarely broadly petiolate; blades (3- or 5-nerved, strongly reticulate-veined) ovate-elliptic to broadly lanceolate, 3-7 × 1.5-4 cm (firm), margins irregularly and coarsely serrate, apices acute to obtuse, faces: abaxial pilose, stipitate-glandular (especially on veins), adaxial glabrate to stipitate-glandular.
Heads
1.
Involucres
turbinate-campanulate.
Phyllaries
8-19, ovate to broadly lanceolate.
Ray florets
0.
Disc florets
30-60; corollas yellow; anthers yellow.
Cypselae
dark gray, 6-8 mm, densely hirsute (hairs duplex);
pappi
white, bristles barbellate.
2
n
= 38. Flowering May-Jun. Open, often disturbed, oak-pine forests; 400-1400 m; Calif.
Arnica venosa
is known only from Shasta and Trinity counties.
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