Hypericum tetrapetalum

Lamarck

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.
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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

Distribution

V6 141-distribution-map.jpg

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

Discussion

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

None.

Lower Taxa

None.
... 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 +