LakeStewardship


Haloragaceae
Water-milfoil Family

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Myriophyllum aquaticum - Parrot Feather
Line drawing of Myriophyllum aquaticum
Line Drawing - note whorls of six feathery leaves
Myriophyllum aquaticum - growth habit
Growth habit. Longwood Gardens, June 2003
Myriophyllum aquaticum - growth habit
Growth habit. Longwood Gardens, June 2003

Myriophyllum farwellii - Watermilfoil

This is a native watermilfoil found growing in lakes and ponds. It grows close to the bottom in branching colonies. The stems are much less robust and brigther green than Eurasian watermilfoil. There were not any fruiting structures on this sample, so an exact identification could not be ascertained. However, the presence of winter buds (dense tips of vegetative branches) points to M. farwellii rather than M. humile, a similar native species.
Myriophyllum farwellii
Upper Saranac Lake, August 2002
Myriophyllum farwellii
Upper Saranac Lake, August 2002
Myriophyllum farwellii
Upper Saranac Lake, August 2002
Myriophyllum farwellii
Upper Saranac Lake, August 2002
Myriophyllum farwellii
Upper Saranac Lake, August 2002
Myriophyllum farwellii
Upper Saranac Lake, August 2002
Myriophyllum farwellii
Upper Saranac Lake, August 2002
Myriophyllum farwellii
Upper Saranac Lake, August 2002
Myriophyllum farwellii
Upper Saranac Lake, August 2002

Myriophyllum heterophyllum - Variable-leaf Watermilfoil (INVASIVE)
Myriophyllum heterophyllum
Line Drawing

Myriophyllum sibiricum (M. exalbescens) - Northern Watermilfoil
This is a native watermilfoil found growing in lakes and ponds. It often grows in dense stands, but stays close to the bottom. The leaves have 11 or fewer segments on a side, with the uppermost leaves being rounded at the apex. Northern watermilfoil forms winter buds in the fall, a dense area of leaves at the stem tip.
Myriophyllum sibiricum growth habit
Growth habit. Minerva Lake, July 2003.
Myriophyllum sibiricum growth habit
Growth habit. Minerva Lake, July 2003.
Myriophyllum sibiricum stems
Stems. Minerva Lake, July 2003.
Myriophyllum sibiricum stems
Stems. Minerva Lake, July 2003.
Myriophyllum sibiricum stems
Closeup of stem. Minerva Lake, July 2003.
Myriophyllum closeup of leaf
Closeup of leaf. Note rounded end. Minerva Lake, July 2003.

Myriophyllum spicatum - Eurasian Watermilfoil (INVASIVE)
This is a non-native invasive watermilfoil found growing in lakes and ponds. It often grows in dense stands and grows to the surface, forming mats. The leaves have 12 or fewer segments on a side, with the uppermost leaves being truncate (square-ish) at the apex. Eurasian milfoil does not form winter buds.
Myriophyllum spicatum
Upper Saranac Lake, August 2002
Myriophyllum spicatum
Upper Saranac Lake, August 2002
Myriophyllum spicatum
Closeup on stem. Upper Saranac Lake, August 2002
Myriophyllum spicatum
Upper Saranac Lake, August 2002
Myriophyllum spicatum
Closeup on stem. Upper Saranac Lake, August 2002
Myriophyllum spicatum
Emergent flowering tip (to left). Upper Saranac Lake, August 2002
Myriophyllum spicatum
Closeup on emergent flowering tip. Upper Saranac Lake, August 2002
line drawing
Line drawing
Myriophyllum spicatum
View from a boat. Mountain View Lake, July 2001
Myriophyllum spicatum
View from a boat. Mountain View Lake, July 2001
Myriophyllum spicatum
View from a boat. Mountain View Lake, July 2001
Myriophyllum spicatum
View from a boat. Mountain View Lake, July 2001
Myriophyllum spicatum
View from a boat. That is Elodea canadensis in foreground (submerged). Mountain View Lake, July 2001
Myriophyllum spicatum
View from a boat. Mountain View Lake, July 2001
Myriophyllum spicatum
Mat in flower.. Leatherstocking Pond. September 2002
Myriophyllum spicatum
Inflorescence (flower stalks). Leatherstocking Pond. September 2002
Myriophyllum spicatum
Closeup of inflorescence - note staminate flowers above pistallate flowers. Leatherstocking Pond. September 2002

Proserpinaca pectinata - Mermaidweed
line drawing
Line drawing
 

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copyright © Michael R. Martin 2003-2015
Last updated: Friday, January 22, 2016 4:11 PM