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Hypericum gramineum

G.Forst. (1786)

This name is accepted

Kingdom: Viridiplantae Phylum: Magnoliophyta Class/Clade: Eudicot-Rosids Order: Malpighiales Family: Hypericaceae Genus: Hypericum

St. John's wort

Description

Key Characters:

Growth Form: Perennial or sometimes annual herbs.

Stems: Stems erect, 0.2–7 dm long, branched only at base.

Roots:

Leaves: Leaves simple. Opposite. Blades lanceolate to linear or oblong, 4–25 mm long, 1–8 mm wide. Base cordate to rounded. Surfaces glandular punctate with pale and inconspicuous glands. Margins somewhat revolute, margins entire. Sessile and usually surrounding the stem. Stipules absent.

Flowers: Flowers few in cymes or occasionally solitary in the upper 1–3 leaf axils. Flowers bisexual (perfect). Sepals lanceolate to narrowly elliptic, 2.8–7.5(–9) mm long, glandular punctate toward the tips. Petals yellow or orange, 5–10 mm long. Stamens 30–50, in inconspicuous clusters. Ovary superior; styles 3.

Fruit: Capsules ovoid to cylindrical; 2.5–8 mm long. Seeds yellowish brown; cylindrical; ca. 0.5 mm long; longitudinally ribbed.

Ploidy: 2n = 16

Habitat:

Elevation Range:

Historical Distribution

Uses and Culture

USES

  • Yes

Natural History

Statewide Status

Naturalized

Island Status

Hawai'i Naturalized

Dispersal Agents


Pollinators

Bibliography

Name Published In: Fl. Ins. Austr.: 53 (1786)

Other References

Wagner et al. 1990:544 (H)

Occurrences

SNo. Scientific Name Scientific Name Authorship Locality Habitat Basis of Record Recorded By Record Number Island Source Date
1 Hypericum gramineum G.Forst. Kanahaha, Kona Between fence and house. PRESERVED_SPECIMEN Forbes, C.N. 253 Hawaii BISH 6/25/1911
2 Hypericum gramineum G.Forst. kanahaha, kona Between fence and house. PRESERVED_SPECIMEN forbes, c.n. collector number: 253 Hawaii BISH 6/25/1911
3 Hypericum gramineum G.Forst. hualalai. kanahaha sheep station Rock crevices PRESERVED_SPECIMEN stemmermann, r.l. springer, h.k.; d. chang-abru collector number: 6916 Maui BISH 9/23/1984
4 Hypericum gramineum G.Forst. Kaanahaha, Central Plateau, Hawaii Common in water-holding sandy pockets. PRESERVED_SPECIMEN Greenwell, A.B.H. 21381 Hawaii BISH 7/1/1951
5 Hypericum gramineum G.Forst. n. kona, kanahaha PRESERVED_SPECIMEN greenwell, a.b.h. collector number: 19254 Maui BISH 9/17/1948
6 Hypericum gramineum G.Forst. n. kona district. keauhou 2 ahu. tr 57(79); nw slopes of mauna loa Dry mamane-mixed native trees community with an exotic grass-native shrub understory. On smooth pahoehoe with shallow pockets of cindery soil. PRESERVED_SPECIMEN warshauer, f.r. mceldowney, p.h. collector number: frw 1835 Hawaii BISH 6/16/1978
7 Hypericum gramineum G.Forst. N. Kona, Kanahaha PRESERVED_SPECIMEN Greenwell, A.B.H. 19254 Hawaii BISH 9/17/1948
8 Hypericum gramineum G.Forst. Hualalai. Kanahaha sheep station Barren Vegetation. PRESERVED_SPECIMEN Stemmermann, R.L. 6916 Hawaii BISH 9/23/1984
9 Hypericum gramineum G.Forst. N. Kona District. Keauhou 2 AHU. Tr 57(79); NW slopes of Mauna Loa Dry mamane-mixed native trees community with an exotic grass-native shrub understory. On smooth pahoehoe with shallow pockets of cindery soil. PRESERVED_SPECIMEN Warshauer, F.R. FRW 1835 Hawaii BISH 6/16/1978
10 Hypericum gramineum G.Forst. kaanahaha, central plateau, hawaii Common in water-holding sandy pockets. PRESERVED_SPECIMEN greenwell, a.b.h. collector number: 21381 Hawaii BISH 7/1/1951
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