Rudbeckia hirta

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Rudbeckia hirta
Rudbeckia hirta flowerhead
Rudbeckia hirta flowerhead
Scientific classification
Kingdom: Plantae
Division: Magnoliophyta
Class: Magnoliopsida
Order: Asterales
Family: Asteraceae
Genus: Rudbeckia
Species: R. hirta
Binomial name
Rudbeckia hirta
L.

Rudbeckia hirta is a flowering plant in the family Asteraceae. It is an upright annual (sometimes biennial or perennial) native to most of North America, and is one of a number of plants with the common name Black-eyed Susan that also has purple on the side.

The plant can reach a height of 1-2 m. It has alternate, mostly basal leaves 20-75 cm long, covered by coarse hair. It flowers from June to August, with inflorescences measuring 10-15 cm in diameter (up to 30 cm in some cultivars), with yellow ray florets circling a brown, domed center of disc florets.

There are four varieties:

  • Rudbeckia hirta var. angustifolia. Southeastern United States (South Carolina to Texas).
  • Rudbeckia hirta var. floridana. Florida, endemic.
  • Rudbeckia hirta var. hirta. Northeastern United States (Maine to Alabama).
  • Rudbeckia hirta var. pulcherrima. Widespread in most of North America (Newfoundland to British Columbia, south to Alabama and New Mexico; naturalized Washington to California).

Black-eyed Susan was designated the state Floral Emblem of Maryland in 1918.

Numerous cultivars have been selected for garden planting; some popular ones include 'Double Gold', 'Indian Summer', and 'Marmalade'.

The roots of Rudbeckia hirta have been used in a warm infusion to wash on sores and snake bites, and to make medicinal drinks for treating colds and worms in children. Ooze from the roots had been used as drops for earaches.

Inflorescence and involucral bracts

Rudbeckia hirta 'Indian summer'

Rudbeckia hirta 'Indian summer'

Rudbeckia hirta in southern Maine.

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