Arnica venosa

H. M. Hall

Univ. Calif. Publ. Bot. 6: 174. 1915.

Common names: Shasta County arnica
Endemic
Treatment appears in FNA Volume 21. Treatment on page 376. Mentioned on page 367.

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-nerved 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. 2n = 38.


Phenology: Flowering May–Jun.
Habitat: Open, often disturbed, oak-pine forests
Elevation: 400–1400 m

Discussion

Arnica venosa is known only from Shasta and Trinity counties.

Selected References

None.

Lower Taxa

None.
... more about "Arnica venosa"
stipitate-glandular +  and pilose +
glabrate +  and stipitate-glandular +
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
corymbiform +  and cymiform +
indeterminate +  and determinate +
Steven J. Wolf +
H. M. Hall +
decurrent +
compound +  and simple +
3 cm30 mm <br />0.03 m <br /> (7 cm70 mm <br />0.07 m <br />) +
ovate-elliptic;broadly lanceolate +
1.5cm;4cm +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
connate +  and distinct +
petiolate +  and sessile +
Shasta County arnica +
stipitate-glandular +  and hairy +
obovoid-cylindric +, fusiform +  and conic +
fertile +  and bisexual +
fertile +  and bisexual +
400–1400 m +
glabrous +, glandular +, hairy +, stipitate-glandular +, woolly +, villous +, tomentose +, scabrous +, puberulent +, pilose +, hispidulous +  and hirsute +
scabrellous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
campanulate +  and cylindric +
Open, often disturbed, oak-pine forests +
discoid +  and radiate +
in cymiform or corymbiform arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.6 cm6 mm <br />0.006 m <br /> (2 cm20 mm <br />0.02 m <br />) +
turbinate-campanulate +
sessile +  and petiolate +
cauline +  and basal +
6 (?) +  and 10 (?) +
deltate +
toothed +  and entire +
2-carpellate +
subplumose +  and barbellate +
persistent +
10 +  and 50 +
aristate +
Flowering May–Jun. +
8 +  and 19 +
Univ. Calif. Publ. Bot. +
bearing subulate enations +, hairy +  and bristly +
pitted +  and smooth +
distinct +
4 +  and 20 +
exalbuminous +
branched +  and simple +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Bahiinae +  and Undefined (tribe Undefined) subtribe Palafoxiinae +
Arnica venosa +
species +
campanulate +  and cylindric +
80 cm800 mm <br />0.8 m <br /> (300 cm3,000 mm <br />3 m <br />) +
1 cm10 mm <br />0.01 m <br /> (80 cm800 mm <br />0.8 m <br />) +
toothed +  and entire +
80 cm800 mm <br />0.8 m <br /> (300 cm3,000 mm <br />3 m <br />) +
5 cm50 mm <br />0.05 m <br /> (100 cm1,000 mm <br />1 m <br />) +