圆果雀稗 yuan guo que bai

Paspalum orbiculare G. Forster, Fl. Ins. Austr. 7. 1786; P. thunbergii Kunth ex Steudel var. minus Makino.

Perennial. Culms tufted, erect, 30–90 cm tall. Leaf blades 10–20 × 0.5–1 cm, usually glabrous. Spikelets often paired, at least in middle part of raceme, broadly obovate, 2–2.2 mm; upper glume and lower lemma 3–5-veined, veins green, back pallid; upper lemma yellow-brown or mid-brown at maturity. Fl. and fr. Jun–Nov. 2n = 20, 40, 54, 60.

Hill slopes, roadsides, fields. Fujian, Guangdong, Guangxi, Guizhou, Hubei, Jiangsu, Jiangxi, Sichuan, Taiwan, Yunnan, Zhejiang [SE Asia; Australia, Pacific Islands (Polynesia)].

This variety is unusual in Paspalum scrobiculatum in frequently having paired spikelets, although often the inner spikelet of the pair is reduced. There is also a less well-defined difference from var. bispica-tum in shape of the spikelet and color of the spikelet veins, and for this reason this variety is sometimes treated as a separate species. However, when the inner spikelets are vestigial or absent, the racemes are 2-rowed and then the two varieties are very difficult to separate.