Rudbeckia triloba

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Rudbeckia triloba

Secure  (NatureServe)[1]
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Rudbeckia
Species:
R. triloba
Binomial name
Rudbeckia triloba

Rudbeckia triloba,

native
to the central and eastern United States and is often seen in old fields or along roads. It is also cultivated as an ornamental.

Description

Rudbeckia triloba is a

basal leaves have three lobes (hence The Latin specific epithet triloba).[4] The stem leaves are alternate and can vary in shape, from three-lobed, generally toward the bottom of the stem, to unlobed, higher up on the central stem and on the secondary branches. The three-lobed stem leaves are up to 7 in (18 cm) long and 4 in (10 cm) wide, and the unlobed leaves are up to 3 in (8 cm) long and 1 in (3 cm) wide.[5]

One or two

flower heads measuring 0.5–1.5 in (1–4 cm) appear at the end of individual upper stems. Each flower head has six to twelve bright yellow ray florets surrounding a purplish brown flattened cone of disk florets. The flower heads are abundant and showy, although they have little or no scent.[6][7]

Similar species

Compared with Rudbeckia hirta, R. triloba is taller with smaller, more numerous flowers, and the leaves of R. hirta are unlobed with a fuzzy upper surface.[5] Compared with Rudbeckia laciniata, R. triloba is shorter and has fewer lobed leaves.[6]

Distribution and habitat

R. triloba is native in the United States from Utah to the west, Texas and Florida to the south, Minnesota to the north, and Massachusetts to the east.[1] Habitats include disturbed ground, woodland borders, thickets, rocky slopes, and alongside roads and railways.[7]

Uses

Cultivation

R. triloba is widely cultivated in gardens and is easy to grow when provided with full sun and moist soil. The plant should be deadheaded regularly to encourage additional bloom, prevent any unwanted self-seeding, or both.[7][8]

In cultivation in the UK, Rudbeckia triloba has gained the Royal Horticultural Society's Award of Garden Merit.[9][10]

See also

References

  1. ^ a b "NatureServe Explorer 2.0". explorer.natureserve.org.
  2. ^ USDA, NRCS (n.d.). "Rudbeckia triloba". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team.
  3. ^ "Rudbeckia triloba". Germplasm Resources Information Network. Agricultural Research Service, United States Department of Agriculture.
  4. ISBN 184533731X
    .
  5. ^ a b "Know Your Natives – Brown-Eyed Susan". Arkansas Native Plant Society. 19 August 2016.
  6. ^ a b "Brown-Eyed Susan (Rudbeckia triloba)". www.illinoiswildflowers.info.
  7. ^ a b c "Rudbeckia triloba page". www.missouriplants.com.
  8. ^ "Rudbeckia triloba - Plant Finder". www.missouribotanicalgarden.org.
  9. ^ "RHS Plantfinder - Rudbeckia triloba". Retrieved 11 October 2018.
  10. ^ "AGM Plants - Ornamental" (PDF). Royal Horticultural Society. July 2017. p. 93. Retrieved 11 October 2018.
Wikiversity has bloom time data for Rudbeckia triloba on the Bloom Clock
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