2. Triadenum walteri (J.G. Gmel.) Gleason

Hypericum walteri J.G. Gmel.

H. tubulosum Walter var. walteri (J.G. Gmel.) Lott

T. tubulosum Walter var. walteri (J.G. Gmel.) Cooperr.

Pl. 362 a, b; Map 1576

Stems 40–100 cm long. Leaves short-petiolate, the uppermost leaves occasionally sessile or nearly so. Leaf blades 3–15 cm long, oblong-elliptic to oblanceolate, the tip rounded to less commonly bluntly pointed, the base narrowed or tapered, the upper surface green to olive green or yellowish green, the undersurface pale green, sometimes somewhat glaucous, with clear to light yellowish resinous secretory cavities, the punctations appearing as pale to nearly clear (rarely darker) glandular dots. Sepals 3–5 mm long, narrowly elliptic, bluntly pointed at the tip. Petals 5–7 mm long. Stamens in each group with the filaments united only toward the base. Fruits 7–12 mm long. July–September.

Uncommon in the southeastern quarter of the state (eastern [mostly southeastern] U.S. west to Illinois, Oklahoma, and Texas). Swamps, bottomland forests, margins of ponds and sinkhole ponds, and less commonly on ledges of sandstone bluffs.

The punctations on the leaf undersurface in this species can be translucent or nearly so and thus difficult to observe. This character should be evaluated carefully to avoid misdetermination of specimens. On any given leaf, at least some of the punctations will be visible under magnification either as colored dots or as minute changes in the surface topography.