28a. Hypericum hypericoides (Linnaeus) Crantz subsp. hypericoides
Ascyrum crux-andreae (Linnaeus) Crantz var. angustifolium Nuttall; A. linifolium Spach; A. michauxii Spach; A. montanum Rafinesque; A. oblongifolium Spach; A. plumieri Bertoloni
Plants erect, usually unbranched from base and freely branched well above ground level, 3–15 dm. Leaf blades usually narrowly elliptic to narrowly oblong, 7–25 × 1–8.5 mm, broadest near middle. Inflorescences: branching dichasial/lateral to pseudodichotomous. 2n = 18.
Flowering summer–fall (Jun–Oct). Dry, open, sandy woods to moist, shady, rich woods and thickets; 0–1000 m; Ala., Ark., Del., Fla., Ga., Ill., Ky., La., Md., Miss., Mo., N.J., N.C., Okla., S.C., Tenn., Tex., Va., W.Va.
Subspecies hypericoides is probably extirpated in Illinois.