Hypericum setosum

Linnaeus

Sp. Pl. 2: 787. 1753.

Endemic
Synonyms: Ascyrum villosum Linnaeus Brathys tomentosa Spach Hypericum pilosum Walter H. villosum (Linnaeus) Crantz
Treatment appears in FNA Volume 6. Treatment on page 91. Mentioned on page 88.
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Herbs annual or perennial, erect, usually unbranched proximal to inflorescence, 2–8 dm. Stems: internodes 4-lined, scabrous-tomentose to pilose. Leaves appressed to ascending, sessile; blade narrowly ovate or lanceolate to narrowly oblongelliptic (or proximal oblanceolate), 4–15 × 1.5–7 mm, subcoriaceous, margins recurved, apex acute to obtuse, surfaces scabrous-tomentose to pilose, basal veins 1 (–5), midrib with 0–1 pair of branches. Inflorescences cylindric to subcorymbiform, to 30-flowered, branching mostly dichasial. Flowers 5–11 mm diam.; sepals ovate to ovatelanceolate or obovate, subequal, 2.5–5 × 1.5–2.5 mm, margins setulose-ciliate, apex acute; petals 5, deep yellow, obovate, 4–7 mm; stamens (15–) 20–40, filaments almost distinct; styles 1.5–2 mm; stigmas ± broadly capitate. Capsules ovoid to ellipsoid-subglobose, 3.5–5 × 2–3 mm. Seeds 0.4–0.6 mm; testa linear-reticulate. 2n = 12.


Phenology: Flowering early–late summer (Jun–Sep).
Habitat: Wet ditches, bogs, savannas, wet pinelands on sandy soil
Elevation: 0–200 m

Distribution

V6 153-distribution-map.jpg

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

Discussion

Hypericum setosum is the only American Hypericum sp. with an indumentum. It is related to H. virgatum (H. denticulatum subsp. acutifolium); in addition to having the indumentum, it is generally smaller and less branched and has a different chromosome number.

Selected References

None.

Lower Taxa

None.
... more about "Hypericum setosum"
reddish +  and black +
yellow;orange +
oblong;ellipsoid +
acute;acute;obtuse +
Norman K. B. Robson +
Linnaeus +
striate +  and smooth +
punctiform +
distinct +
0.4 cm4 mm <br />0.004 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
lanceolate +  and narrowly oblongelliptic +
subcoriaceous +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
ovoid;ellipsoid-subglobose +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Ala. +, Fla. +, Ga. +, La. +, Miss. +, N.C. +, S.C. +, Tex. +  and Va. +
0–200 m +
0.5 cm5 mm <br />0.005 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
Wet ditches, bogs, savannas, wet pinelands on sandy soil +
dichasial +, branching +  and 30-flowered +
axillary +  and terminal +
scabrous-tomentose +  and pilose +
terete +  and angled +
persistent +  and deciduous +
appressed;ascending +
glandular-ciliate +
(2-)3(-4)-merous +
axile +  and parietal +
glanduliferous +
contorted +  and imbricate +
persistent +
distinct +
obovate +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Flowering early–late summer (Jun–Sep). +
interrupted +  and continuous +
not carinate +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (?) +  and 0.06 cm0.6 mm <br />6.0e-4 m <br /> (?) +
persistent +
connate +  and distinct +
ovate;ovatelanceolate or obovate +
subequal +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
connate +, distinct +  and fascicles +
persistent +
clavate +  and capitate +
expanded +  and minute +
connate +  and distinct +
elongate +
0.15 cm1.5 mm <br />0.0015 m <br /> (?) +  and 0.2 cm2 mm <br />0.002 m <br /> (?) +
scabrous-tomentose;pilose +
Ascyrum villosum +, Brathys tomentosa +, Hypericum pilosum +  and H. villosum +
Hypericum setosum +
Hypericum sect. Brathys +
species +
scalariform +
reticulate +  and foveolate +
perennial +  and annual +
hairy +  and glabrous +
6 +, 9 +  and 7 +