Small deciduous shrubs (most species herbaceous) with flaking bark. Twigs slender, angled; pith relatively large, somewhat porous, finally excavated in older stems. Buds solitary, sessile, minute. Leaf-scars opposite, small, triangular; bundle-trace 1; stipule-scars lacking. Fruit a small capsule persistent in winter.

Fig. 222. Hypericum spathulatum

Fig. 222. Hypericum spathulatum.

Fig. 223. Hypericum densiflorum

Fig. 223. Hypericum densiflorum.

a.

Dried capsule 7-15 mm. long

b. Shrub 2-6 dm. high; capsule 7-10 mm. long

1.

H. kalmianum

b. Shrub up to 2. 5 m. tall;capsule 8-15 mm. long

2.

H. spathulatum

a.

Dried capsules 4-6 mm. long

3.

H. densiflorum

1. H. kalmianum L. Kalm's St. John's-Wort. Slender shrub 2-6 dm. high, with papery whitish bark and ascending 4-edged branches, and 2-edged branchlets; corymb-vestiges open. Rocky soil, chiefly near the Great Lakes, Quebec to Ontario, south to New York and Illinois.

2. H. spathulatum (Spach) Steud. Shrubby St. John's Wort. (H. prolificum of authors, not L.). Shrub to 2. 5 m. high, very bushy; twigs 2-edged. Dry or damp thickets, New York to Ontario and Minnesota, south to Georgia, Alabama, and Arkansas (Fig. 222).

3. H. densiflorum Pursh. Dense-flowered Shrubby St. John's-Wort. Shrub to 2 m. high, quite bushy; twigs slender, 2-edged. Wet acid soil, Florida to Texas, north to New Jersey, West Virginia, and Missouri (Fig. 223).