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Western Wetland Flora

Field Office Guide to Plant Species

Bog St. John's-wort
Hypericum anagalloides Cham. & Schlecht.

JPG -- Species Photo JPG -- Distribution Map

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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Page Last Modified: Saturday, 02-Feb-2013 06:27:13 EST
Menlo Park, CA [caww55]