Hypericum tenuifolium


Fl. Amer. Sept. 2: 377. 1813.

Synonyms: Hypericum fasciculatum var. laxifolium Choisy H. reductum (Svenson) W. P. Adams
Treatment appears in FNA Volume 6. Treatment on page 79. Mentioned on page 75, 80.
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Shrubs, usually decumbent, not rooting, forming mats, 1–5 dm. Stems: internodes 6-lined at first, becoming 4-lined, then terete. Leaf blades linear-subulate, 4–11 × 0.4–0.8 mm, base articulated, persistent, parallel or slightly expanded, margins revolute, apex rounded with ± prominent hydathode to long-acuminate, midrib unbranched. Inflorescences ± narrowly cylindric, 1–7-flowered, with 1(–3)-flowered dichasia from to 4 proximal nodes, rarely with 1 pair of flowering branches; flowers sessile or nearly so. Flowers 10–14 mm diam.; sepals deciduous, not enclosing capsule, 5, linear-subulate, unequal, 2–4 × 0.4–0.5 mm; petals 5, bright yellow, oblanceolate-oblong to obovate, 5–10 mm; stamens deciduous, 50–90; ovary 3-merous. Capsules narrowly (sub-)cylindric, (4–)5.7–9.5 × 1.5–2 mm. Seeds scarcely carinate, 0.5 mm; testa coarsely reticulate. 2n = 18.

Phenology: Flowering spring–mid summer (Apr–Jul).
Habitat: Dry, sandy woods, dunes and dune hollows, coastal plain
Elevation: 0–200 m


V6 123-distribution-map.jpg

Ala., Fla., Ga., N.C., S.C.


Hypericum tenuifolium differs from H. galioides in habit, leaf size, and inflorescence, and in its drier habitat. Its nonrooting stems, longer leaves, and (usually) longer stems distinguish it from H. lloydii.

Selected References


Lower Taxa

... more about "Hypericum tenuifolium"
Norman K. B. Robson +
Undefined sect. Myriandra +
Ala. +, Fla. +, Ga. +, N.C. +  and S.C. +
0–200 m +
Dry, sandy woods, dunes and dune hollows, coastal plain +
Flowering spring–mid summer (Apr–Jul). +
Fl. Amer. Sept. +
Hypericum fasciculatum var. laxifolium +  and H. reductum +
Hypericum tenuifolium +
Hypericum sect. Myriandra +
species +