Hieracium purkynei Čelakovský (1886: 8)

Szeląg, Zbigniew, 2023, Hieracium purkynei (Asteraceae): an endemic to the Sudetes rediscovered after a century, Phytotaxa 601 (1), pp. 90-96 : 91-92

Hieracium purkynei Čelakovský (1886: 8) ( Figs. 1–3 )

Type: — CZECHIA. [ Giant Mountains ] Am Kahlenberg nächst der Kesselkoppe, Sudeten, August 1884, C . Purkyně (holotype PR) .

Description:― Phyllopodous. Stem 35–45 cm high (up to 60 cm in cultivation), robust, slightly purplish at base, in lower third with numerous, pale, 2.5–3.0 mm long simple hairs, without or with very few stellate hairs; in middle third with scattered, pale, 2.0– 2.5 mm long simple hairs and scattered stellate hairs; in upper third with sparse, pale, dark-based, up to 1.5 mm long, simple hairs, numerous to subdense stellate hairs and few, blackish, 0.2 mm long glandular hairs. Synflorescence rather corymbose than paniculate with 8–14(–18) capitula (up to 25 in cultivation). Acladium up to 1.0 cm. Synflorescence branches in axis of upper cauline leaves, covered by dense stellate hairs, sparse, pale, dark-based, up to 1.0 mm long, simple hairs and numerous, blackish, 0.3–0.4 mm long glandular hairs. Rosette leaves 4–16, grass-green, present at anthesis, up to 16 cm long and up to 4.0 cm wide, oblanceolate, remotely denticulate or subentire, the outer rounded at apex, the inner subacute at apex, gradually tapered to a long, winged, purplish petiole covered by dense, pale, 3.0– 3.5 mm long simple hairs, and scattered brownish, 0.2–0.3 mm long glands; on the upper surface with scattered, pale, up to 1.5 mm long simple hairs; on the lower surface with numerous, pale, up to 2.0 mm long simple hairs; on the midrib with dense, pale, 3.0– 3.5 mm long simple hairs and sparse, brownish up to 0.3 mm long glandular hairs; on the margins with dense, pale, up to 1.5 mm long, simple hairs and a few, yellowish glands. Cauline leaves 2–3, oblanceolate, acute at apex, denticulate or sharply dentate, gradually reduced in size upwards; lowest leaf tapered to a short, winged petiole covered by dense, pale, 3.0 mm long simple hairs, on the midrib mixed with sparse stellate hairs and yellowish glands, on the margins with numerous, pale, up to 1.5 mm long simple hairs and few glandular hairs; middle cauline leaf sessile, covered by the same indumentum as the lowest one. The 1–3- uppermost cauline leaves sessile, aristate, 1.0 cm long; on the lower surface and margins with numerous, pale, up to 1.5 mm long, simple hairs, and scattered stellate hairs; upper surface glabrous. Peduncles thin, erect, up to 1.0 cm long, grey, covered by dense stellate hairs, numerous to dense, 0.2–0.4 mm long, blackish glandular hairs, and scattered, up to 1.4 mm long, dark-based simple hairs. Bracteoles 0–2, linear, up to 4 mm long, covered by the same indumentum as the involucral bracts. Involucres 9–10 mm long, campanulate, with dense indumentum. Involucral bracts in three rows; dark green with pale margins, lanceolate, subacute at apex, with numerous, blackish, 0.2–0.4 mm long, glandular hairs, numerous, black in lower half, up to 1.7 mm long simple hairs (ratio of simple hairs to glandular hairs 1:1) and numerous to dense stellate hairs on margins especially at base of involucral bracts. Ligules warm yellow, 1.9 cm long, sparsely ciliate or almost glabrous at apex. Styles in living plants dirty-yellow, in dried specimens dark (i.e. yellow with dense black trichomes). Achenes dark-brown, (3.2–) 3.4–3.8 mm long. Pappus straw-grey. Pollen numerous, spherical and of regular size. Flowering: July.

The description is based on herbarium specimens and living plants in the garden and in the field.

Figures

FIGURE 1. Hieracium purkynei specimens from plants cultivated in the author’s garden.

FIGURE 2. Holotype of Hieracium purkynei (PR).

FIGURE 3. Hieracium purkynei by the Szrenicki Potok stream, on July 9, 2019.