Hypericum hyssopifolium (Nomenclature)
Perennial herb, 0.3–0.6 mm tall, glabrous, erect from scarcely ascending base, not rooting at base, without or with few sterile erect shoots. Stems not glaucous, with or without (?) small scattered amber glands almost up to inflorescence, not or slightly prominent; internodes 1.2–4 mm, shorter than to exceeding leaves. Leaves shortly (c. 1 mm) petiolulate, spreading, not glaucous; lamina (main stem) 12–30 × 1–3.5 mm, linear to linear-oblong or linear-elliptic, apex rounded or acute, margin revolute, base cuneate, with laminar glands pale, small, scattered; lamina (axillary and sterile shoots) smaller, narrower, apex rounded. Inflorescence ∞-flowered, from (5–)6–10 nodes, very narrowly cylindric to narrowly ellipsoid, ± dense, 6–16 mm long, with lateral cymules 1–3-flowered, sometimes with flowering branches from 1–4 nodes below; bracts and bracteoles ‘free’, linear to linear-lanceolate, without or with a few marginal black glands. Flowers 10–13 mm in diam., reflexed after flowering; buds globose. Sepals subequal, free or basally united, (2)3–4(–5) × 1–1.5 mm, ovate to elliptic or oblong, obtuse to rounded; veins (3)5; margin with regular (or rarely irregular) sessile globose black glands; laminar glands pale, linear to punctiform. Petals golden? yellow, not red-tinged, 6–9 × 3–4 mm, obovate to oblanceolate, subunguiculate, rounded, distally with regular sessile black marginal glands; laminar glands pale, proximal and distal, punctiform to striiform. Stamens c. 30–35, longest 7–9 mm; filaments yellow. Ovary c. 3 × 1.5 mm, narrowly ovoid; styles c. 3 mm, equalling ovary. Capsule 9-10 × 6 mm, ovoid, not rostrate; valves vittate. Seeds dark reddish-brown, c. 1.8 mm long.
2n = 20 (Reynaud, 1975).
Open woodland, scrub and grassland, on chalk or limestone; 500–1800 m.
Northern & eastern Spain, southeastern France, northern & central Italy, eastern Serbia, northeastern Bulgaria.
The above description refers to the western Mediterranean population. The Balkan one differs from it in having acute, not rounded leaves and possibly in other characters (I have not seen specimens), which suggests that it should be distinguished at least at subspecific level.