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Hypericum parvulum

Greene (1888)

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: Annual or perennial herbs.

Stems: Stems decumbent to sometimes weakly ascending, 0.1–0.4 dm long, branched or unbranched.

Roots:

Leaves: Leaves simple. Opposite. Blades ovate to oblong or elliptic to suborbicular, sometimes oblong–lanceolate or oblanceolate to spatulate, 2–8(–11) mm long, 1.5–3(–5) mm wide. Base cordate, or cuneate. Surfaces evenly glandular punctate with pale glands. Margins entire. Sessile, surrounding th stem. Stipules absent.

Flowers: Flowers 1 to few in terminal cymes, pedicels (1.4–)2–14 mm long in fruit. Flowers bisexual (perfect). Sepals narrowly elliptic to oblong or oblanceolate, 2–5 mm long. Petals pale yellow, elliptic or oblong to obovate, 1.7–5 mm long. Stamens 5–10, distinct. Ovary superior; styles 3.

Fruit: Capsules broadly ellipsoid; 2.5–5 mm long. Seeds yellowish brown to tan; cylindrical; ca. 0.5 mm long; inconspicuously longitudinally ribbed.

Ploidy:

Habitat: Disturbed areas.

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: Pittonia 1: 154 (1888)

Other References

Wagner et al. 1990:544 (H)

Occurrences

SNo. Scientific Name Locality Habitat Basis of Record Description Recorded By Record Number Island Source Date
1 Hypericum parvulum Mauna Loa, above Kulani, road at edge of rain forest Preserved_Specimen Christ, J.H. 3 Hawaii BISH 1957-04-24
2 Hypericum parvulum Puu Makaala Natural Area Reserve NEON Roadside MEPO5 CIGL mesic wet forest. Growing on rocky substrate in open sunlight. With Metrosideros polymorpha, Cibotium glaucum, Cheirodendron trigynum, Ilex anomala, Sadleria pallida, Microlaena stipoides, Axonopus fissifolius, Cyperus polystachyos, & Plantago major. Preserved_Specimen Flowering. Uehana, S. 2023301 Hawaii BISH 2023-06-29
3 Hypericum parvulum Kilauea Crater, Preserved_Specimen Meebold, A. Hawaii BISH 1932-05-01
4 Hypericum parvulum Laumaia In koa-lehua forest. Preserved_Specimen Neal, M.C. 809 Hawaii BISH 1935-08-17
5 Hypericum parvulum Vicinity of Volcano, Kilauea area Weeds along roadsides. Slightly disturbed tree fern rain forest. Bulldozed (1967) Preserved_Specimen Very abundent, Fls. yellow Iltis, H.H. 81 Hawaii BISH 1967-06-19
6 Hypericum parvulum 1 1/2 air miles S of Volcano House in tree fern forest; i nfrequent terretria forming small patches in rain forest Preserved_Specimen Henrickson, J.S. 4091 Hawaii BISH 1969-08-06
7 Hypericum parvulum Hawaii Volcanoes National Park. Located down Kona-Hilo Hghway about 0.8 miles from Park Entrance toward Kona, just past Sulfur Banks on small, relatively level ridge at left(SW) of highway before a white bridge. Preserved_Specimen Newell, C.L. 608 Hawaii BISH 1966-08-27
8 Hypericum parvulum Puna district. Volcano Refuse Transfer Station, along Highway 11 betw. Glenwood and Volcano; clearing and secondary vegetation in Metrosideros wet forest zone, Preserved_Specimen Low herb with decumbent stems, forming dense mats on ground. Corolla light yellow. Naturalized occasional locally. Lorence, D.H. 6674 Hawaii BISH 1991-01-07
9 Hypericum parvulum Kau District. Kilauea Forest Reserve. Close to IBP Study site In open area Preserved_Specimen Herb. Flowers yellow. common. Herat, T. 969 Hawaii BISH 1974-07-08
10 Hypericum parvulum Drive down Kona-Hilo Hghwy about 6.8 miles toward Hilo from Hongo Store. Walk up unpaved road about 100 meters. Plant was about 20 meters NE(right side) of road Preserved_Specimen Herb about 4 inches tall, yellow flower Newell, C.L. 984 Hawaii BISH 1967-06-26
11 Hypericum parvulum Puna, Hawaii Miquisous, exotic weed in muddy rain-forest Preserved_Specimen Creeping, assurgent Degener, O. 31762 Hawaii BISH 1967-07-04
12 Hypericum parvulum Piihonua, Hilo Forest Reserve Primary vegetation: Metrosideros polymorpha, Ilex anomala. Stunted ohia wetland dieback. Soils are a shallow organic, poorly drained type found on a pahoehoe flow. One small area of water was at or near the surface. Preserved_Specimen Adee, K.T. Hawaii BISH 1979-06-05
13 Hypericum parvulum Kilauea, common in pasture under trees Preserved_Specimen Fls yellow, herb Hosaka, E.Y. 2519 Hawaii BISH 1940-06-11
14 Hypericum parvulum Hawaii National Park, Napau Trail Preserved_Specimen Flowers: yellow Fagerlund, G.O. 14 Hawaii BISH 1942-08-26
15 Hypericum parvulum Mauka of Kulani Prison, naturalized in clearing Preserved_Specimen Degener, O. 21827 Hawaii BISH 1952-02-15
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