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Hypericum densiflorum
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Malpighiales
Family:	Hypericaceae
Genus:	Hypericum
Section:	H. sect. Myriandra
Subsection:	H. subsect. Centrosperma
Species:	H. densiflorum
Binomial name
Hypericum densiflorum Pursh
Synonyms
Hypericum prolificum Britton

Hypericum densiflorum, also known as bushy St. John's wort or dense St. John's wort, is a perennial herb in the flowering plant family Hypericaceae native to North America. The specific epithet densiflorum is Latin, meaning "densely flowered", referring to the many-flowered cymes.

Description

Hypericum densiflorum is a densely branched shrub with coppery bark that grows between 0.5–2 m (1 ft 8 in – 6 ft 7 in) in height. The many slender branches are slightly angled and branchlets are two-edged. The branches bear linear leaves and axillary fascicles, the leaves being 1–2 in (25–51 mm) long and 0.15–0.3 in (3.8–7.6 mm) wide. Its yellow flowers are 1.2–1.7 cm (0.47–0.67 in) wide and are borne on crowded compound cymes. The firm and narrow sepals are 2–5 mm (0.079–0.197 in) long and the pedicels are .1–.4 in (2.5–10.2 mm) long. The capsules vary in shape from lanceolate to slenderly conic, with three carpels and three styles. The capsules are 3.5–6.5 mm (0.14–0.26 in) long and 1.5–3 mm (0.059–0.118 in) thick.

The plant flowers from July to September and fruits from early October to the end of autumn.

Habitat and distribution

Hypericum densiflorum occurs on acidic soils in moist and wet conditions, including stream, pond, and lake banks, seepage slopes, and wet meadows. It prefers sandy clay loam and occurs from sea level to 1,000 m (3,300 ft) of elevation.

The shrub occurs throughout the eastern and southern United States though it grows far west as Texas and as far north as New York.

Ecology

H. densiflorum has been marked as a pollinator plant, supporting and attracting bees.

References

1. ^ New Jersey State Museum (1911). Annual Report of the New Jersey State Museum. Vol. 1910. MacCrellish & Quigley. p. 553.
2. Merrit Lyndon Fernald (1970). R. C. Rollins (ed.). Gray's Manual of Botany (Eighth (Centennial) - Illustrated ed.). D. Van Nostrand Company. p. 1011. ISBN 0-442-22250-5.
3. Nathaniel Lord Britton, Addison Brown (1913). An Illustrated Flora of the Northern United States, Canada and the British Possessions. Vol. 2 (2nd ed.). Charles Scribner's Sons. p. 553.
4. "Hypericum densiflorum (Bushy St. John's-wort)". Lady Bird Johnson Wildflower Center. University of Texas at Austin. Retrieved 18 August 2018.
5. "Hypericum densiflorum". eFloras. Retrieved 18 August 2018.
6. ^ "Planting Guides" (PDF). Pollinator.org. Retrieved 2022-01-29.

• Plants described in 1813
• Hypericum
• Taxa named by Frederick Traugott Pursh