Hypericum nudiflorum

Michaux ex Willdenow

Sp. Pl. 3: 1456. 1802.

Synonyms: Brathydium nudiflorum (Michaux ex Willdenow) K. Koch Myriandra nudiflora (Michaux ex Willdenow) Spach
Treatment appears in FNA Volume 6. Treatment on page 82. Mentioned on page 75, 83.

Subshrubs, erect, usually loosely branched with branches ascending, 5–20 dm. Stems: internodes narrowly 4-winged at first, then terete. Leaf blades ovate-lanceolate or elliptic to linear-oblong, 30–70 × 7–25 mm, base not articulated, cuneate to subcordate, margins plane, apex obtuse to rounded, midrib with to 6 pairs of branches. Inflorescences corymbiform to rounded-pyramidal, 7–45-flowered, narrowly branched, sometimes with 1–7(–40)-flowered dichasia from 1–3 proximal nodes. Flowers 15–20 mm diam.; sepals deciduous, not enclosing capsule, 5, oblanceolate-spatulate to narrowly triangular, unequal to subequal, 2–5 × 1–1.5 mm; petals 5, pale or coppery yellow, oblanceolate-oblong to elliptic-oblong, 6–8(–10) × 3–4 mm, length 2–3 times sepals; stamens persistent, 80; ovary 3(–4)-merous, placentation incompletely axile. Capsules broadly ellipsoid to ovoid-globose, 3.5–7 × 3–5 mm. Seeds markedly carinate, 1.5–2 mm; testa ± scalariform-reticulate. 2n = 18.

Phenology: Flowering summer (Jun–late Aug).
Habitat: Stream banks, moist woodland, swamps
Elevation: 0–1000 m


V6 132-distribution-map.jpg

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


See under 15. Hypericum apocynifolium for differences between it and H. nudiflorum, which has a more eastern distribution. Records from Texas probably are referable to H. apocynifolium.

Hypericum nudiflorum probably is now extirpated in Louisiana.

Selected References


Lower Taxa

... more about "Hypericum nudiflorum"
Norman K. B. Robson +
Michaux ex Willdenow +
Undefined sect. Myriandra +
Ala. +, Fla. +, Ga. +, La. +, Miss. +, N.C. +, S.C. +, Tenn. +  and Va. +
0–1000 m +
Stream banks, moist woodland, swamps +
Flowering summer (Jun–late Aug). +
Brathydium nudiflorum +  and Myriandra nudiflora +
Hypericum nudiflorum +
Hypericum sect. Myriandra +
species +