Hypericum setosum


Sp. Pl. 2: 787. 1753.

Synonyms: Ascyrum villosum Linnaeus Brathys tomentosa Spach Hypericum pilosum Walter H. villosum (Linnaeus) Crantz
Treatment appears in FNA Volume 6. Treatment on page 91. Mentioned on page 88.

Herbs annual or perennial, erect, usually unbranched proximal to inflorescence, 2–8 dm. Stems: internodes 4-lined, scabrous-tomentose to pilose. Leaves appressed to ascending, sessile; blade narrowly ovate or lanceolate to narrowly oblong-elliptic (or proximal oblanceolate), 4–15 × 1.5–7 mm, subcoriaceous, margins recurved, apex acute to obtuse, surfaces scabrous-tomentose to pilose, basal veins 1(–5), midrib with 0–1 pair of branches. Inflorescences cylindric to subcorymbiform, to 30-flowered, branching mostly dichasial. Flowers 5–11 mm diam.; sepals ovate to ovate-lanceolate or obovate, subequal, 2.5–5 × 1.5–2.5 mm, margins setulose-ciliate, apex acute; petals 5, deep yellow, obovate, 4–7 mm; stamens (15–)20–40, filaments almost distinct; styles 1.5–2 mm; stigmas ± broadly capitate. Capsules ovoid to ellipsoid-subglobose, 3.5–5 × 2–3 mm. Seeds 0.4–0.6 mm; testa linear-reticulate. 2n = 12.

Phenology: Flowering early–late summer (Jun–Sep).
Habitat: Wet ditches, bogs, savannas, wet pinelands on sandy soil
Elevation: 0–200 m


V6 153-distribution-map.jpg

Ala., Fla., Ga., La., Miss., N.C., S.C., Tex., Va.


Hypericum setosum is the only American Hypericum sp. with an indumentum. It is related to H. virgatum (H. denticulatum subsp. acutifolium); in addition to having the indumentum, it is generally smaller and less branched and has a different chromosome number.

Selected References


Lower Taxa

... more about "Hypericum setosum"
Norman K. B. Robson +
Linnaeus +
Ala. +, Fla. +, Ga. +, La. +, Miss. +, N.C. +, S.C. +, Tex. +  and Va. +
0–200 m +
Wet ditches, bogs, savannas, wet pinelands on sandy soil +
Flowering early–late summer (Jun–Sep). +
Ascyrum villosum +, Brathys tomentosa +, Hypericum pilosum +  and H. villosum +
Hypericum setosum +
Hypericum sect. Brathys +
species +