1. Rhynchospora corymbosa (Linnaeus) Britton, Trans. New York Acad. Sci. 11: 84. 1892.
伞房刺子莞 san fang ci zi guan
Scirpus corymbosus Linnaeus, Cent. Pl. 2: 7. 1756; Rhynchospora aurea Vahl.
Perennials. Rhizomes short. Culms erect, 60-140 cm tall, stout, 3-angled, with several nodes, smooth or scaberulose on angles. Leaves basal and cauline; sheath semirounded, 2-6 cm, membranous, ligulate at mouth; leaf blade broadly linear, 30-60 × 0.9-1.7 cm, flat, herbaceous to thinly leathery, margin and abaxial midvein scabrous, apex long acuminate. Involucral bracts 3-5, leaflike, shorter than inflorescence, base sheathing. Inflorescence a large compound panicle consisting of 2-5 distant corymbiform anthelae, 20-50 cm; anthelae compound, to 15 cm in diam., ± dense, diffuse, many branched; bractlets setaceous. Spikelets many, in clusters of 2-5, erect or obliquely patent, narrowly ovoid to fusiform, 7-10 mm; basal flower bisexual; apical 1 or 2 flowers male. Glumes 7 or 8, ovate to ovate-lanceolate, basal 4 and apicalmost empty. Perianth bristles 6, as long as nutlet, antrorsely scabrous. Stamens 3; filaments shorter than nutlet and style base; anthers linear; connective subulate. Style ca. 1.7 cm, base dilated; stigmas 2. Nutlet brown, oblong-obovoid to obovoid, 3-4 mm, compressed, finely transversely wrinkled in middle part, coarsely undulate rugose toward margin; persistent style base long conic, ca. 5.5 mm, ± as broad as nutlet, compressed, conspicuously grooved on both sides, smooth or asperous. Fl. and fr. Mar-Dec. 2n = 18.
Moist stream margins along valleys; 100-900 m. Guangdong, Guangxi, Hainan, Hunan, Taiwan, Yunnan [Bangladesh, India, Indonesia, Malaysia, Myanmar, Papua New Guinea, Philippines, Sri Lanka, Thailand, Vietnam; Africa, Australia, Central and South America, Indian Ocean islands, Madagascar, Pacific islands].