Northern Prairie Wildlife Research Center
Western Wetland Flora
Field Office Guide to Plant Species
Bog St. John's-wort
Hypericum anagalloides Cham. & Schlecht.
- Family: St. John's-wort (Guttiferae)
- Flowering: June-August
- Field Marks: This St. John's-wort usually grows in mats and has yellow flowers 1/4-1/3 inch across. The small leaves are rounded at the tip and sometimes clasp the stem.
- Habitat: Marshes, wet meadows, around springs.
- Habit: Annual or sometimes perennial herb, rooting at the nodes, often forming mats.
- Stems: Sprawling or upright, slender, usually unbranched, up to 1 1/4 feet tall, smooth.
- Leaves: Opposite, simple, elliptic to ovate, rounded at the tip, tapering or rounded at the base, on short stalks or sometimes clasping the stem, smooth, with 5 or 7 veins, without teeth.
- Flowers: 1-few in cymes.
- Sepals: 5, green, free from each other, lanceolate, up to 1/6 inch long, unequal in size.
- Petals: 5, yellow, free from each other, oval, up to 1/6 inch long, not dotted.
- Stamens: 15-20.
- Pistils: Ovary superior; styles 5, very short.
- Fruits: Capsules ovoid, up to 1/6 inch long, smooth, containing many seeds.
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