Myriophyllum sibiricum (Northern Water-milfoil) - photos and description

Myriophyllum sibiricum

Myriophyllum sibiricum

Myriophyllum sibiricum

Myriophyllum sibiricum
Male flowers at top of spike, female flowers below

Myriophyllum sibiricum
Female flowers growing in whorls in above photo

Myriophyllum sibiricum

Myriophyllum sibiricum

Myriophyllum sibiricum
Leaves pulled from stem leaving one leaf to photograph

General: Aquatic perennial with submerged, leafy stems. Plants rhizomatous.

Flowers: Flowers grow in a terminal spike, with male flowers at the top of the spike, female flowers below. Female flowers are white, with 4 petals, petals fringed. We measured a female flower at 2 mm diameter and 3 mm long. A bract subtends each flower, we measured a bract growing under a female flower at 3 mm long.

Leaves: Leaves in whorls, have an ovate outline, pinnately divided into thread-like segments, we counted 9 segments on each side of the rachis.

Height: We measured the flowering stem extending 4-6 cm above the water.

Habitat: Lakes, ponds, sloughs, and slow moving streams.

Abundance: Common.

Origin: Native.

When and where photographed: Photos taken July 31st in a shallow pond, boreal forest about 450 km northeast of our home in Regina, SK.