Northern Prairie Wildlife Research Center
Western Wetland Flora
Field Office Guide to Plant Species
Common Large Monkey-flower
Mimulus guttatus DC.
- Family: Figwort (Scrophulariaceae)
- Flowering: May-September
- Field Marks: This is the only yellow-flowered monkey-flower that has an inflated calyx with pointed teeth. The upper leaves are usually longer than broad.
- Habitat: Most wet, mucky places, sometimes growing in shallow standing water.
- Habit: Annual or perennial herb, sometimes rooting at the lower nodes, and sometimes
bearing rhizomes and/or stolons.
- Stems: Upright or ascending, branched or unbranched, up to 2 1/2 feet tall, smooth or
slightly hairy, sometimes hollow.
- Leaves: Opposite, simple, broadly ovate to nearly round, the upper ones usually longer than broad, up to 4 inches long, toothed, smooth or slightly hairy, the upper leaves sessile, the lower on stalks up to 2 1/2 inches long.
- Flowers: Borne in a terminal raceme, yellow, showy.
- Sepals: 5, green, united below to form a bell, up to 3/4 inch long, each lobe triangular, but the middle one much longer than the others, and lanceolate.
- Petals: 5, yellow, often spotted with red-brown, arranged to form 2 lips, one with 3 parts, the other with 2, up to 1 1/4 inches long.
- Stamens: 4, two longer than the others.
- Pistils: Ovary superior; styles 2-lobed.
- Fruits: Capsules oblong to obovoid, narrowed to a short stalk at the base, up to 1/2 inch long; seeds up to 1/4 inch long, brown.
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