Northern Prairie Wildlife Research Center
Southern Wetland Flora
Field Office Guide to Plant Species
Sandweed St. Johnswort
Hypericum fasciculatum Lam.
- Family: St. Johnswort (Hypericaceae)
- Flowering: May-September
- Field Marks: This slightly woody St. Johnswort has leaves less than 1/20 inch wide. It
from other very narrow-leaved species of Hypericum by being erect and having leaves more
1/2 inch long and with 2 longitudinal grooves on the under surface of the leaves.
- Habitat: Low pinelands, bogs, flatwoods, margins of swamps and streams, ditches, sometimes
- Habit: Shrub with 1-several stems.
- Stems: Upright, woody, much branched, slightly winged at first, becoming corky and exfoliating
when old, spongy-thickened below, up to 6 feet tall.
- Leaves: Opposite, simple, but with short branches of tiny leaves in the axils, needle-like, less
than 1/20 inch wide, more than 1/2 inch long, smooth, dotted, sessile, with 2 longitudinal
grooves on the under surface.
- Flowers: Usually in terminal and axillary cymes, rarely solitary in the leaf axils, up to 2/3 inch
- Sepals: 5, green, free from each other, very narrow, up to 1/3 inch long.
- Petals: 5, yellow, free from each other, up to 1/3 inch long, with a tooth near the tip.
- Stamens: Numerous.
- Pistils: Ovary superior; styles 3, often united.
- Fruits: Capsules ovoid, up to 1/4 inch long; seeds brown, very tiny.
Previous Species -- Bushy St. Johnswort (Hypericum densiflorum)
Return to Species List -- Group 5
Next Species -- Bedstraw St. Johnswort (Hypericum galioides)