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Montana Field Guide

Montana Field Guides

Water Pigmy-weed - Tillaea aquatica
Other Names:  Crassula aquatica

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Status Under Review
Native Species

Global Rank: G5
State Rank: SU
(see State Rank Reason below)
C-value: 6

Agency Status


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State Rank Reason (see State Rank above)
Collected in Sanders County. Status in the state unresolved.
General Description
Small glabrous annual. Stems prostrate to ascending, branched, 1–4 cm. Leaves all cauline, opposite, linear, terete, 3–6 mm long, united around the stem. Flowers solitary in leaf axils, 4-merous, calyx up to 1 mm long; petals white, 1–2 mm long. Follicles 1–1.5 mm long, erect, deep red; seeds 1 to few per follicle (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Spotty distribution throughout the Northern Hemisphere.

Mud or shallow water along ponds, streams; valleys (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

  • 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.
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Citation for data on this website:
Water Pigmy-weed — Tillaea aquatica.  Montana Field Guide.  .  Retrieved on , from