Hypericum tenuifolium

Pursh

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

Endemic
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.

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

Distribution

V6 123-distribution-map.jpg

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

Discussion

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

None.

Lower Taxa

None.
... more about "Hypericum tenuifolium"
reddish +  and black +
yellow;orange +
oblong;ellipsoid +
rounded +
Norman K. B. Robson +
striate +  and smooth +
punctiform +
articulated +
persistent +
distinct +
expanded +
Undefined sect. Myriandra +
0.4 cm4 mm <br />0.004 m <br /> (0.57 cm5.7 mm <br />0.0057 m <br />) +
0.57 cm5.7 mm <br />0.0057 m <br /> (0.95 cm9.5 mm <br />0.0095 m <br />) +
cylindric +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Ala. +, Fla. +, Ga. +, N.C. +  and S.C. +
0–200 m +
connate +  and distinct +
nearly +  and sessile +
1 cm10 mm <br />0.01 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
Dry, sandy woods, dunes and dune hollows, coastal plain +
long-acuminate +
axillary +  and terminal +
4-lined +  and 6-lined +
0.4 cm4 mm <br />0.004 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
linear-subulate +
0.4mm;0.8mm +
glanduliferous +, petiolate +, pseudopetiolate +, subsessile +, sessile +, estipulate +  and simple +
persistent +  and deciduous +
glandular-ciliate +
incompletely axile +  and parietal +
glanduliferous +
contorted +  and imbricate +
bright-yellow +
deciduous +
distinct +
oblanceolate-oblong;obovate +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Flowering spring–mid summer (Apr–Jul). +
Fl. Amer. Sept. +
carinate +
0.5 cm5 mm <br />0.005 m <br /> (?) +
deciduous +
connate +  and distinct +
linear-subulate +
unequal +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
connate +  and distinct +
spreading;more or less appressed +
elongate +
Hypericum fasciculatum var. laxifolium +  and H. reductum +
Hypericum tenuifolium +
Hypericum sect. Myriandra +
species +
scalariform +
reticulate +  and foveolate +
perennial +  and annual +
hairy +  and glabrous +
6 +, 9 +  and 7 +