Monographs Details: Hypericum sphaerocarpum Michx.
Authority: Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Description:Species Description - Erect perennial 3–7 dm, somewhat woody below, often rhizomatous but the stems clustered; lvs linear-oblong to narrowly elliptic, 3–7 cm × 5–15 mm, with or without evident lateral veins, acute or obtuse, tapering to the base; infl much-branched and usually compact; bracts lanceolate; sep lanceolate to ovate, equal or nearly so, 2.5–5 mm; pet 5–9 mm; stamens 45–85; stigmas 3(4), minute; fr globose to ovoid, 5–7 mm, slender-beaked, strictly unilocular; seeds 2–2.7 mm. Upland woods, prairies, and barrens; O. and Ky. to Io., Kans., and Okla., s. to Ala. and Ark. June–Aug. (H. cistifolium, misapplied)