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Montana Field Guide

Montana Field Guides

American Thorowax - Bupleurum americanum


Global Rank: G5
State Rank: S4

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 5

External Links






 
General Description
Glabrous and glaucous perennial with a woody, branched caudex. Stems erect to ascending, 5–50 cm. Leaves simple, linear to lance-linear, entire, 2–12 cm long. Umbels compound, terminal and axillary; rays 1–5 cm long; involucral bracts lanceolate, 5–15 mm long; involucel of ovate bracts 2–5 mm long, united below; umbellets compact. Flowers yellow; stylopodium hemispheric; petals <1 mm long. Mericarps narrowly elliptic, 2–3 mm long, glabrous, glaucous; ribs raised but not winged; oil tubes many in the intervals (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Present
 


Range Comments
AK to ID, WY; Asia (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 50

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Habitat
Stony soil of grasslands, meadows, turf, fellfields; montane to alpine (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
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Citation for data on this website:
American Thorowax — Bupleurum americanum.  Montana Field Guide.  .  Retrieved on , from