壶状石山苣苔Petrocodon urceolatus

Petrocodon urceolatus
Petrocodon urceolatus

20120805,湖南张家界天门山

Nordic Journal of Botany 35: 334–338, 2017
Petrocodon urceolatus sp. nov. (Gesneriaceae) from Zhangjiajie city,northwestern Hunan Province, China

Petrocodon urceolatus F. Wen, H.F. Cen & L.F. Fu,sp. nov.

Perennial herb forming acaulescent rosettes. Rhizome subterete, 3–5 cm long, 1.0–1.5 cm in diameter. Leaves 5–10, clustered at apex of rhizome, opposite; petiole terete, 1–6  0.6–0.8 cm, pubescent; leaf blade chartaceous, coriaceous when dried, often almost symmetrical, narrowly
elliptic or lanceolate-elliptic, 2–10  1–2 cm, cuneate at base, acuminate to acute at apex, with entire margins, both surfaces green, abaxially glabrous, adaxially sparsely strigillose
close to midrib; lateral veins 3–6 on each side of midrib, slightly prominent abaxially, slightly sunken adaxially. Cymes 1–5, with 1–5 branches and 4–20 flowers; peduncle 4.0–6.5
cm long, ca 0.2 mm in diameter, sparsely pubescent, brownish; bracts 2, linear or lanceolate-linear, ca 2.5  0.5 mm, with entire margin and acuminate apex, abaxially strigose,adaxially glabrous; bracteoles 2, linear or linear-lanceolate,ca 0.5  0.2 mm, with entire margin and acuminate apex;pedicel 4–12 mm long, ca 1.5 mm in diameter, sparsely pubescent, brownish. Calyx actinomorphic, 5-parted to the base; lobes narrowly lanceolate-linear, ca 1 mm long, abaxially
puberulent, brownish, adaxially glabrous. Corolla white,zygomorphic, urceolate, swollen, glabrous on both surfaces,3–6 mm long, 2–4 mm in diameter at middle; orifice constricted,ca 0.9 mm in diameter; limb 5-lobed; adaxial lip 2-lobed to near or over a half of the length of lobes, deltoid,
1.2–2.8 mm long, 0.5–1.7 mm wide at base, acute at apex; abaxial lip 3-lobed to base of lobes, deltoid; lateral lobes 1.1–2.5 mm long, 0.8–1.4 mm at base, acute at apex; median lobe 1.5–3.0 mm long, 1.0–1.6 mm at base, acute at apex. Stamens 2, glabrous, adnate ca 1 mm above the corolla base;filaments ca 2 mm long, slightly curved, scattered glandularpubescent;anthers yellowish, elliptic, ca 1.5 mm long, glabrous;staminode 1, adnate ca 0.4 mm above corolla base,ca 0.4 mm long, capitate at apex. Disk annular, ca 0.5 mm high, with repand margin. Pistil 0.5–1.6 cm long, labrous;ovary ovoid, ca 2.0  1.5 mm; style glabrous, ca 1.5 mm long; stigma translucent to green, capitate, emarginate at apex, 0.5–1.0 mm in diameter. Capsule not seen.



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