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Montana Field Guide

Montana Field Guides

Flower-of-an-Hour - Hibiscus trionum
Other Names:  Venice Mallow, Bladder Hibiscus

Non-native Species

Global Rank: GNR
State Rank: SNA

Agency Status
MNPS Threat Rank:
C-value: 1

External Links

General Description
Hirsute annual. Stems erect, branched, 10–60 cm. Leaf blades orbicular, divided nearly to the base; lobes 3 to 7, 1–4 cm long. Flowers axillary, subtened by linear bracts; calyx veiny, inflated, 8–14 mm long, with short, acute lobes; petals whitish with a purple base,15–40 mm long. Schizocarp 1–3 cm high, hirsute with 5 sections (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range

Range Comments
SK to NS south to OR, UT, TX, FL; introduced from Europe (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 5

(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)


  • Literature Cited AboveLegend:   View Online Publication
    • Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • McGregor, R.L., coordinator, and T.M. Barkley, R.E. Brooks, and E.K. Schofield, eds.: Great Plains Flora Association. 1986. Flora of the Great Plains. Lawrence, KS: Univ. Press Kansas. 1392 pp.
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Citation for data on this website:
Flower-of-an-Hour — Hibiscus trionum.  Montana Field Guide.  .  Retrieved on , from