• You are here:
• Full Key
• All other flowering non-woody plants
• Daisies, goldenrods, and other aster family plants
• Mycelis muralis

Mycelis muralis — wall-lettuce

Facts

Wall-lettuce is a European introduction with limited distribution in North America, and occasionally found in New England. The common name may reflect the tendency of this species to grow on or near walls in Europe.

Habitat

Anthropogenic (man-made or disturbed habitats), forests, meadows and fields

Characteristics

• Flowers

  Bract cycle number

  there are two main cycles of bracts

  Bract inner side hairs

  the bracts are not hairy on their inner surfaces

  Bract outer side hair type

  the bracts are not hairy on their outer surface

  Bract outer side hairs

  the bracts are not hairy on their outer surfaces

  Bract shape

  • the main bracts are lanceolate (widest above the base, then taper narrowly towards the tip)
  • the main bracts are linear (long and very narrow)

  Bract spines

  the bracts have no spines

  Bract tip orientation

  the tips of the bracts curve outwards and downwards from the plant

  Bract tip shape

  the tips of the bracts are rounded

  Disk flower color

  NA

  Disk flower lobe number

  NA

  Disk flower number

  NA

  Disk flower proportions

  NA

  Disk flower reproductive parts

  NA

  Disk flower shape

  NA

  Flower head number

  each flowering stem has four or more flower heads on it

  Flower head outer flowers

  at the outer edge of the flower head, each flower has a single enlarged lobe or strap

  Flower head platform

  the base has no bristles or papery scales

  Flower head platform surface

  the scales are smooth, no visible hairs

  Flower head position

  each of the flower heads is separate on its own peduncle (stalk), not clustered in groups

  Flower head profile

  the disk is flat or nearly flat across the top

  Flower head shape

  the sides of the flower head are roughly parallel, like a cylinder

  Flower type in flower heads

  the flower head has ray flowers only, meaning all of the individual flowers of the flower head have a strap-shaped ray, which may or may not have teeth at the very tip of the ray

  Height of flower head base

  7–20 mm

  Inflorescence branching (Solidago)

  NA

  Inflorescence shape

  the inflorescence is not flat-topped but appears rounded, with some flower heads distinctly higher than others

  Inflorescence stem

  the stem of the inflorescence is not hairy

  Ovary beak

  there is a beak on the ovary

  Ovary cross-section

  the ovary is compressed (flattened)

  Ovary hair type

  the ovary has hairs on it, but the hairs have no glands

  Ovary hairs

  the ovary has hairs on it

  Ovary lines or ribs

  • there are four to six lines or ribs visible on the ovary
  • there are seven to nine ribs visible on the ovary

  Ovary profile

  • in profile, the ovary is lanceolate (widest below the middle, tapering to both ends)
  • in profile, the ovary is roughly egg-shaped, but widest above the middle

  Peduncle hair type

  NA

  Peduncle hairs

  the peduncles have no hairs

  Peduncle length

  5–26 mm

  Ray flower color

  yellow

  Ray flower reproductive parts

  the ray flowers have both carpels and stamens

  Ray flowers

  1-5

  Reproductive system

  NA

  Rim at top of ovary

  the central flowers have a disk-shaped platform above the ovary

  Smaller bracts at base of bracts

  there is no smaller, outer cycle of bracts

  Swelling at base of flower head

  the peduncles are not swollen, or only slightly

  Width of flower head base

  1.5–3 mm

• Fruits or seeds

  Number of pappus parts

  11 or more

  Ovary beak length

  0.5–1 mm

  Ovary length in developed fruit

  3–4 mm

  Seed hair tuft color

  the pappus hairs are white or off-white

  Seed hair tuft details

  the pappus hairs are hooked or barbed

  Seed hair tuft length

  0.1–6 mm

  Seed hair tuft tips

  the pappus hairs are slender

  Seed hairs uniform

  there are two distinct lengths of pappus hairs

  Seed tuft type

  the pappus is made of very fine hairs or bristles

  Tuft or plume on fruit

  at least a part of the plume is made up of fine bristles

• Glands or sap

  Sap

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

• Growth form

  Growth form

  the plant has one or more free-standing stems

  Plant lifespan

  • the plant is annual, it lacks evidence of previous years' growth
  • the plant is biennial, it appears as either first year (non-reproductive) plants or second year plants with flowers or fruit

  Spines on plant

  the plant has no spines

  Underground organs

  there is a thickened taproot on the plant

• Leaves

  Hairs on underside of leaf blade

  the underside of the leaf is not hairy, or has very few hairs

  Hairs on upper side of leaf blade

  the upper side of the leaf is not hairy, or has very few hairs

  Leaf arrangement

  • alternate: there is one leaf per node along the stem
  • basal: the leaves are growing only at the base of the plant

  Leaf blade base

  • the leaf has a distinct petiole
  • the leaf has no petiole

  Leaf blade base shape

  the base of the leaf blade is cuneate (wedge-shaped, tapers to the base with relatively straight, converging edges), or narrow

  Leaf blade edges

  • the edge of the leaf blade has lobes, or it has both teeth and lobes
  • the edge of the leaf blade has teeth

  Leaf blade hairs

  NA

  Leaf blade length

  50–220 mm

  Leaf blade shape

  • the leaf blade is oblanceolate (lance-shaped, but with the widest point above the middle of the leaf blade)
  • the leaf blade is spatulate (spoon-shaped; narrow near the base, then suddenly widening to a rounded tip)

  Leaf blade tip

  the tip of the leaf blade is acute (sharply pointed)

  Leaf blade width

  35–90 mm

  Leaf disposition

  the leaves are nearly similar in size, prominence of teeth, and length of stalks throughout the stem

  Leaf spines

  there are no spines on the leaf edges

  Leaf stalk

  • the leaves have leaf stalks
  • the leaves have no leaf stalks, but attach directly to the stem

  Leaf type

  leaves are simple (i.e., lobed or unlobed but not separated into leaflets)

  Specific leaf type

  • the leaf has a row of two or more lobes on each side of the central axis
  • the leaves are simple (i.e., lobed or unlobed but not separated into leaflets

• Place

  Habitat

  terrestrial

  New England state

  • Maine
  • Massachusetts
  • New Hampshire
  • Vermont

  Specific habitat

  • forests
  • man-made or disturbed habitats
  • meadows or fields

• Stem, shoot, branch

  Flowering stem cross-section

  NA

  Leaves on stem

  there is at least one full leaf above the base of the flowering stem

  Stem bloom

  the stem has a powdery or waxy film on it that can be rubbed away

  Stem internode hair direction

  NA

  Stem internode hair type

  the stem has no hairs between the nodes

  Stem internode hairs

  the stem has no hairs between the nodes

Wetland status

Not classified

New England distribution and conservation status

From the dichotomous key of Flora Novae Angliae