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Ornithogalum umbellatum — nap-at-noon

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Facts

Nap-at-noon is widely planted as a garden ornamental, producing an abundance of bulblets that are transported in soil and can become very weedy. The flowers open just before noon and close before sunset every day.

Habitat

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

New England distribution

Adapted from BONAP data

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North America distribution

Adapted from BONAP data

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Characteristics

Habitat
terrestrial
New England state
  • Connecticut
  • Maine
  • Massachusetts
  • New Hampshire
  • Rhode Island
  • Vermont
Leaf arrangement
basal: the leaves are growing only at the base of the plant
Leaf blade shape
  • the leaf blade is lanceolate (lance-shaped; widest below the middle and tapering at both ends)
  • the leaf blade is linear (very narrow with more or less parallel sides)
Leaf blade length
200–600 mm
Flower petal color
  • green to brown
  • white
Flower petal length
15–30 mm
Petal fusion
the perianth parts are separate
Inflorescence type
the inflorescence is a corymb (with long lower branches and shorter upper branches, giving it a more or less flat-topped look)
Ovary position
the ovary is above the point of petal and/or sepal attachment
Fruit type (specific)
the fruit is a capsule (splits along two or more seams, apical teeth or pores when dry, to release two or more seeds)
Fruit length
8–18 mm
Show all characteristics

  • Clonal plantlets

    Axillary bulblets
    there are no bulblets being produced in axils

  • Flowers

    Anther attachment
    the anther is attached by its base to the filament
    Bulblets replace flowers
    there are no bulblets where the flowers are located
    Carpels fused
    the carpels are fused (the number of carpels equals the number of locules)
    Flower number
    4–20
    Flower petal color
    • green to brown
    • white
    Flower petal length
    15–30 mm
    Flower symmetry
    there are two or more ways to evenly divide the flower (the flower is radially symmetrical)
    Fringed petal edges
    the petals are not fringed
    Inflorescence type
    the inflorescence is a corymb (with long lower branches and shorter upper branches, giving it a more or less flat-topped look)
    Marks on petals
    the petals have spots or streaks on them
    Nectar spur
    the flower has no nectar spurs
    Number of pistils
    1
    Number of styles
    1
    Ovary position
    the ovary is above the point of petal and/or sepal attachment
    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 fusion
    the perianth parts are separate
    Sepal appearance
    the sepals resemble petals in color and texture
    Sepal length
    15–30 mm
    Sepals fused only to sepals
    the sepals are separate from one another
    Spathe
    the plant does not have a spathe
    Spathe form
    NA
    Stamen number
    6
    Stamen position relative to petals
    NA
    Stamens fused outwards
    • the stamens are fused to the petals or tepals at or near their bases
    • the stamens are not fused to the petals or tepals
    Style petal-like
    the style is not broad and flattened like a petal
    Tepals
    the petals and sepals are similar in size and color

  • Fruits or seeds

    Berry color
    NA
    Capsule ridges
    • there are no ribs or wings on the capsule
    • there are six or more ribs or wings on the capsule
    Fruit compartments
    there are three locules in the fruit
    Fruit length
    8–18 mm
    Fruit type (general)
    the fruit is dry and splits open when ripe
    Fruit type (specific)
    the fruit is a capsule (splits along two or more seams, apical teeth or pores when dry, to release two or more seeds)
    Fruit width
    6–15 mm
    Other markings on berry
    NA

  • Glands or sap

    Sap
    the sap is clear and watery

  • Growth form

    Lifespan
    the plant lives more than two years
    Underground organs
    the plant has one or more swollen storage organs underground, such as bulbs, tubers or corms

  • Leaves

    Leaf arrangement
    basal: the leaves are growing only at the base of the plant
    Leaf blade basal lobes
    the leaf blades do not have basal lobes
    Leaf blade base
    the leaf has no stalk
    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 cross-section
    • the leaf blade is U- or V-shaped
    • the leaf blade is more or less flat in cross-section
    Leaf blade faces
    both surfaces of the leaf blade are exposed
    Leaf blade form
    Fully-formed (i.e., expanded), +/- green leaf blades are found somewhere on the plant
    Leaf blade length
    200–600 mm
    Leaf blade shape
    • the leaf blade is lanceolate (lance-shaped; widest below the middle and tapering at both ends)
    • the leaf blade is linear (very narrow with more or less parallel sides)
    Leaf blade surface colors
    the upper side of the leaf blade has obvious spots, mottles or stripes
    Leaf blade veins
    the lateral veins are parallel or slightly arched in the direction of the tip
    Leaf blade width
    3–5 mm
    Leaf type
    the leaves are simple (i.e., lobed or unlobed but not separated into leaflets
    Stipule twining
    NA
    Stipules
    there are no stipules on this plant

  • Place

    Habitat
    terrestrial
    New England state
    • Connecticut
    • Maine
    • Massachusetts
    • New Hampshire
    • Rhode Island
    • Vermont
    Specific habitat
    • edges of forests
    • man-made or disturbed habitats
    • meadows or fields

  • Scent

    Plant odor
    the leaves have no particular smell

  • Stem, shoot, branch

    Flowering stem leaves
    there are no true leaves on the flowering stem

Wetland status

Usually occurs in non-wetlands, but occasionally in wetlands. (Wetland indicator code: FACU)

In New England

Distribution

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

Conservation status

Exact status definitions can vary from state to state. For details, please check with your state.

Massachusetts
not applicable (S-rank: SNA)

From Flora Novae Angliae dichotomous key

2.  Ornithogalum umbellatum L. E

nap-at-noon. CT, MA, ME, NH, RI, VT. Fields, roadsides, forest edges and openings.

Native to North America?

No

Sometimes confused with

Ornithogalum nutans:
inflorescence racemose, +/- cylindric, with mostly 5–12 flowers, pedicels nodding, especially after anthesis, and leaves 5–10 mm (vs. O. umbellatum, with the inflorescence corymbose, flat-topped, with mostly 8–20 flowers, pedicels ascending to erect, and leaves 3–5 mm wide).

Family

Hyacinthaceae

Genus

Ornithogalum