Hypericum tetrapetalum


in J. Lamarck et al., Encycl. 4: 153. 1797.

Synonyms: Ascyrum amplexicaule Michaux A. cubense Grisebach A. tetrapetalum (Lamarck) Vail
Treatment appears in FNA Volume 6. Treatment on page 86. Mentioned on page 74.

Herbs (perennial) or shrubs, erect, with woody base, usually unbranched, sometimes with divaricate or ascending branches, 2–10 dm. Stems: internodes (2–)4-lined at first, then 2-lined to terete. Leaf blades oblong-ovate to ovate or triangular-ovate, 5–35 × 4–15 mm, base articulated, cordate-amplexicaul, margins subrecurved, apex apiculate or obtuse to rounded, midrib with 1 pair of branches. Inflorescences terminal, 1(–3)-flowered, branching from apical node pseudodichotomous, sometimes with relatively short branches from to 3 proximal nodes. Flowers 20–30 mm diam.; sepals persistent, enclosing capsule, 4, unequal, outer broadly ovate, 7–15 × 5.5–10 mm, apex subapiculate to obtuse, inner narrowly lanceolate, 7–15 × 2–3 mm, apex acute; petals 4, bright yellow, obovate-oblong, 10–15 mm; stamens persistent, 100; ovary 3-merous. Capsules broadly ellipsoid-ovoid to subglobose, 5–6 × 3.5–4 mm. Seeds not carinate, 0.7 mm; testa shallowly scalariform. 2n = 18.

Phenology: Flowering winter–spring (Jan–Apr), late summer (Jul–Sep).
Habitat: Moist, low pinelands, ditches
Elevation: 0–200 m


V6 141-distribution-map.jpg

Ala., Fla., Ga., West Indies (w Cuba).


Hypericum tetrapetalum differs from H. crux-andreae in having broader leaves with strongly cordate-amplexicaul bases and, nearly always, by terminal pseudodichotomous inflorescences.

Selected References


Lower Taxa

... more about "Hypericum tetrapetalum"
Norman K. B. Robson +
Lamarck +
Undefined sect. Myriandra +
Ala. +, Fla. +, Ga. +  and West Indies (w Cuba). +
0–200 m +
Moist, low pinelands, ditches +
Flowering winter–spring (Jan–Apr), late summer (Jul–Sep). +
in J. Lamarck et al., Encycl. +
Ascyrum amplexicaule +, A. cubense +  and A. tetrapetalum +
Hypericum tetrapetalum +
Hypericum sect. Myriandra +
species +