Alisma triviale — northern water-plantain

Characteristics

• Clonal plantlets

  Turion length

  0 mm

• Flowers

  Anther color

  there is a noticeable pink, reddish or purplish tint to the anthers

  Anther length

  0.6–1 mm

  Carpels fused

  the carpel is solitary or (if 2 or more) the carpels are not fused to one another

  Flower lower lip length

  0 mm

  Flower position

  • the flowers are above the surface of the water
  • the flowers are below the surface of the water

  Flower symmetry

  there are two or more ways to evenly divide the flower (the flower is radially symmetrical)

  Inflorescence length

  Up to 1000 mm

  Inflorescence type

  the inflorescence is a panicle (branched, with the individual flowers on stalks)

  Length of peduncle

  100–1000 mm

  Nectar spur

  the flower has no nectar spurs

  Number of carpels

  At least 3

  Ovary position

  the sepals and/or petals are attached below the ovary

  Palate on corolla

  no

  Petal and sepal arrangement

  the flower includes two cycles of petal- or sepal-like structures

  Petal appearance

  the petals are thin and delicate, and pigmented (colored other than green or brown)

  Petal color

  white

  Petal fringed edges

  the petals are fringed

  Petal hairs on inner/upper surface

  there are no hairs on the inner/upper petal surface

  Petal length

  3.8–4.5 mm

  Petal number

  3

  Petal or sepal number

  there are three petals, sepals, or tepals in the flower

  Pistil number

  6 or more

  Sepal appearance

  the sepals resemble leaves in color and texture

  Sepal length

  3–6 mm

  Sepal number

  3

  Spur length

  0 mm

  Stamen number

  6

  Stamen position relative to petals

  NA

  Stamens fused

  the stamens are not fused to one another

  Stamens fused to petals

  the stamens are not fused to the petals or tepals

  Style length

  0.4–0.6 mm

  Style number

  15–20

• Fruits or seeds

  Fruit length

  1.8–3 mm

  Fruit type (general)

  the fruit is dry but does not split open when ripe

  Fruit type (specific)

  the fruit is an achene (dry, usually 1-seeded, does not separate or split open at maturity)

  Fruit width

  1.5–2 mm

• Glands or sap

  Oil glands on nodes

  none of the nodes have oil glands

  Sap

  the sap is milky and opaque, and may be white or colored

• Growth form

  Lifespan

  the plant lives more than two years

  Root septa

  the roots do not have transverse septa

  Roots floating in water

  there are no clusters of roots floating in the water

  Turions

  there are no turions on the plant

  Underground organs

  the plant has a rhizome (a horizontal underground stem with roots growing from it)

• Leaves

  Bract position (Sparganium)

  NA

  Bract relative length

  At least 1379 mm

  Bracts

  the flowers or their pedicels have bracts at their bases

  Floating leaf basal lobes

  NA

  Floating leaf blade width

  0 mm

  Floating leaf length

  0 mm

  Floating leaf shape

  NA

  Floating leaf tip

  NA

  Floral bract form

  the bracts are roughly as lobed as the foliage leaves

  Leaf arrangement

  the leaves are growing only at the base of the plant (basal)

  Leaf blade length

  30–350 mm

  Leaf blade veins

  the lateral veins are parallel or slightly arched in the direction of the tip

  Leaf blade width

  30–120 mm

  Leaf special features

  none of the mentioned special features are present

  Leaf-like branch segments

  0

  Leaf-like branch shape

  NA

  Specific leaf type

  the leaf is not divided, rather the blade is made up of one segment

  Staminate bract edge (Myriophyllum)

  NA

  Stipule appearance

  NA

  Stipule fused to leaf

  NA

  Stipules

  there are no stipules on the plant

  Stipules fused around stem

  NA

  Trap-bladder length

  0 mm

  Underwater leaf blade edges

  NA

  Underwater leaf blade shape

  NA

  Underwater leaf blade veins

  0

  Underwater leaf blade width

  0 mm

  Underwater leaf length

  0 mm

  Underwater leaf stalk

  NA

  Underwater leaf stalk length

  0 mm

  Underwater leaf tip shape

  NA

  Veins in floating leaf

  0

• Place

  Habitat

  • aquatic
  • wetlands

  New England state

  • Connecticut
  • Maine
  • Massachusetts
  • New Hampshire
  • Rhode Island
  • Vermont

  Specific habitat

  • edges of wetlands
  • in lakes or ponds
  • in rivers or streams
  • man-made or disturbed habitats
  • marshes
  • shores of rivers or lakes

• Stem, shoot, branch

  Flowering stem growth form

  the flowering stem is upright

Wetland status

Occurs only in wetlands. (Wetland indicator code: OBL)

In New England

From Flora Novae Angliae dichotomous key