长序砂仁 chang xu sha ren

Amomum thyrsoideum Gagnepain, Bull. Soc. Bot. France 49: 256. 1903, not Ruiz & Pavón (1798).

Roots tuberous. Leaf sheath striate, glabrous; ligule orbicular, 4--5 mm; petiole ca. 5 mm; leaf blade oblong-lanceolate, 20--25 × ca. 6 cm, glabrous, midvein becoming obscure toward apex, base rounded, apex acuminate. Spikes cylindric, 8--13 cm; peduncle ca. 30 cm, scalelike sheaths ovate-lanceolate, ca. 3 cm; bracts imbricate, purple, lanceolate, 2--2.3 cm; bracteoles tubular, 0.9--1.2 cm, split on 1 side, apex 2-cleft. Calyx subcylindric, ca. 1 cm, abaxially villous, apex 3-toothed. Corolla tube equaling calyx, villous; lobes yellow, ca. 1.4 cm × 6 mm, central one ca. 9 mm wide. Lateral staminodes toothlike, ca. 1 mm. Labellum yellow at midvein with purple veins, spatulate-fan-shaped, ca. 1.5 × 1.2 cm, base attenuate, apex 2-cleft. Stamen ca. 1.1 cm; filament ca. 5 mm; connective appendage semiorbicular, ca. 1.5 mm. Ovary hirsute. Capsule subglobose or ovoid, ca. 2.5 × 1.2--1.8 cm, with dense, curved spines. Seeds 3--4 mm in diam., angled. Fl. May, fr. Jul. 2 n = 48*.

Dense forests. Guangxi [Vietnam].