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Montana Field Guide

Montana Field Guides

Hopi-tea - Thelesperma megapotamicum

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Status Under Review
Undetermined Origin

Global Rank: G5
State Rank: SNA
(see State Rank Reason below)

Agency Status


External Links

State Rank Reason (see State Rank above)
Reported for Montana in Intermountain Flora Vol. 5. Unresolved as native. Possibly accidentally introduced at a reclamation area in Big Horn County.
General Description
Perennials or subshrubs. Cauline leaves opposite, 1-2 times pinnatifid, the lobes mostly linear to filiform, sometimes oblanceolate. Outermost phyllaries (calyculi) of 3–5+ ovate to oblong bractlets; inner phyllaries connate to above the middle, the lobes with scarious margins. Ray florets absent. Disc corollas yellow, often with red-brown nerves, throats shorter than lobes. Achenes 5–8 mm long; pappus of 2-3 retrosely hispid awns (adapted from Strother, 2006, Flora N. America Vol. 19; and Welsh et al., 1993, A Utah Flora, Second Ed.).

Diagnostic Characteristics
This species is most easily distinguished from the related Thelesperma subnudum by its taller stems (up to 80 cm tall) and the absence of ray flowers.

Range Comments
WY and SD south through UT and AZ to TX and Mexico; outlying occurrences in CA, OR, AR, MO, MN, MI, IL, and IN (Kartesz 2013, in prep.)

Observations in Montana Natural Heritage Program Database
Number of Observations: 3

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



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

Open and often disturbed sites, typically sands or clays, in many habitat types (Strother, 2006, in Flora N. America Vol. 19; Welsh et al. 1993, A Utah Flora, 2nd Ed.)

  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2022. Manual of Montana Vascular Plants, Second Edition. Fort Worth, TX: BRIT Press. viii + 779 p.
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Citation for data on this website:
Hopi-tea — Thelesperma megapotamicum.  Montana Field Guide.  .  Retrieved on , from