Rudbeckia laciniata

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Rudbeckia laciniata, the cutleaf coneflower,[1] is a species of flowering plant in the family Asteraceae. Other common names include cutleaf, goldenglow, green-headed coneflower, tall coneflower, sochan and thimbleweed. It is native to North American floodplains, stream banks, and moist forests. Although toxic to animals, the leaves have culinary uses.

Description

File:Korina 2010-08-23 Rudbeckia laciniata.jpg
Growing in garden

It is a robust herbaceous perennial plant growing up to Template:Convert tall.[2] Long rhizomes are formed as persistence organs with fibrous roots. The stem is bare. The alternate leaves are usually divided into a petiole and a leaf blade. They are up to Template:Convert long,[2] broadly ovate, somewhat glaucous, and often deeply dissected, with smooth to roughly serrated margins. The smooth or hairy leaf blade is simple or one to two-pinnate. The leaflets are lobed three to eleven times.

Inflorescence

The composite flowers (flower heads) are produced in late summer and autumn. The disc flowers are green to yellowish green, while the rays are pale yellow. In umbrella-clustered total inflorescences, two to 25 cup-shaped partial inflorescences stand together. The flower heads, which have a diameter of Template:Convert, stand on long stems. 8 to 15 irregularly arranged, foliage-like, smooth to hairy bracts have a length of up to 2 cm and usually a ciliate border. The inflorescence base is almost spherical to conical. The chaff leaves are Template:Convert long.[3]

In a flower basket there are 8–12 ray flowers and 150 to over 300 tubular disk flowers. The golden-yellow rays are 1.5 to 5 cm long and Template:Convert wide and are later repulsed. The yellow to yellowish-green tubular flowers are Template:Convert in length and 10 to 23 mm in diameter, with yellow corolla lobes Template:Convert long. The stylus branches have a length of 1 to 1.5 mm.

The 3 to 4.5 mm long achenes have a crown-shaped or four up to 1.5 mm long scales consisting of pappus.

Similar species

R. hirta is similar, with a hemispherical disk and orangish-yellow rays.[2]

Taxonomy

Up to six varieties of R. laciniata are currently recognized. The varieties ampla and heterophylla are considered to be the most distinctive, while the others less so. There is variation in treatment among authors, with the less distinctive varieties sometimes being subsumed into laciniata, and variety ampla sometimes recognized at the species level.[4][5]

The six varieties are:[6]

  • Rudbeckia laciniata var. ampla – Native west of the Great Plains, into the Rocky Mountains
  • Rudbeckia laciniata var. bipinnata – Native to New England and the Mid-Atlantic area
  • Rudbeckia laciniata var. digitata – Native to the Southeastern Coastal Plain
  • Rudbeckia laciniata var. heterophylla – Endemic to Levy County, Florida
  • Rudbeckia laciniata var. humilis – Native to the southern Appalachian Mountains
  • Rudbeckia laciniata var. laciniata – Widespread and common, native across eastern North America

Etymology

The Latin specific epithet laciniata refers to the pinnately divided leaves.[7]

Distribution and habitat

It is native to North America, where it is widespread in both Canada and the United States.[8] Its natural habitat is wet sites in floodplains, along stream banks, and in moist forests.[4]

Cultivation

Rudbeckia laciniata is widely cultivated in gardens and for cut flowers. Numerous cultivars have been developed, of which 'Herbstsonne' ("Autumn sun") and 'Starcadia Razzle Dazzle'[9] have gained the Royal Horticultural Society's Award of Garden Merit.[10][11] The cultivar 'Goldquelle' features double yellow, pom-pom blooms that are 8 cm across.[12]

Rudbeckia laciniata has long been cultivated as an ornamental plant and came to Paris in the private garden of Vespasias Robin at the beginning of the 17th century. Caspar Bauhin also received this ornamental plant from Robin in 1622, who described it as 'Doronicum americanum laciniato folio'. The first garden in Germany in which it is recorded is Altdorf 1646. The double-flowered form, which is mainly cultivated, has been known since around 1894. The first naturalizations on river banks in Central Europe were observed in the 18th century. Anton Johann Krocker reported about it in 1787 in Queistal near Flinsburg in eastern Upper Lusatia. As an ornamental plant, varieties are used in parks and gardens in temperate areas, for example also filled forms. In Europe, Rudbeckia laciniata became wild in various countries. Besides Europe, Rudbeckia laciniata is a neophyte in China and New Zealand. [6][13]

The Lady Bird Johnson Wildflower Center[14] notes that "Because it spreads rampantly by underground stems, cut-leaf coneflower is only appropriate for large sites."

Toxicity

The plant is somewhat toxic to livestock.[2] One report cites circumstantial evidence of poisoning to horses, sheep and pigs.[15]

Uses

Traditionally, the young leaves have been gathered from the wild and eaten in the early spring. They are greatly favored as a potherb (cooked). Though some references state the use of this plant as salad greens (raw),[16] traditional use is as cooked greens.[17][18] This is assumed to be done to remove toxins, although there is little evidence of their presence.[15]

Gallery

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References

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External links

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  1. ↑ Template:PLANTS
  2. ↑ a b c d Script error: No such module "citation/CS1".
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  4. ↑ a b Template:EFloras
  5. ↑ Script error: No such module "citation/CS1".
  6. ↑ Script error: No such module "citation/CS1".
  7. ↑ Script error: No such module "citation/CS1".
  8. ↑ Template:BONAP
  9. ↑ Script error: No such module "citation/CS1".
  10. ↑ Script error: No such module "citation/CS1".
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ Rudbeckia laciniata 'Goldquelle' (d) www.rhs.org.uk The Royal Horticultural Society 2021
  13. ↑ Gerhard Wagenitz: Rudbeckia laciniata. In: Gerhard Wagenitz (Hrsg.): Illustrated flora of Central Europe. Pteridophyta, Spermatophyta. Founded by Gustav Hegi. 2nd, completely revised edition. Volume VI. Part 3: Angiospermae, Dicotyledones 4 (Compositae 1, General Part, Eupatorium - Achillea) . Paul Parey, Berlin / Hamburg 1979, ISBN 3-489-84020-8, pp. 242–244 (published in deliveries 1964–1979).
  14. ↑ Template:NPIN
  15. ↑ a b Script error: No such module "citation/CS1".
  16. ↑ Banks, William. 2004. Plants of the Cherokee. Great Smoky Mts. Assn.: Gatlinburg, Tennessee.
  17. ↑ Script error: No such module "citation/CS1".
  18. ↑ Script error: No such module "Citation/CS1".
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