Themeda japonica (Willd.) C. Tanaka, Bull. Sci. Fak. Terkult. Kyusyu. .l: 194. 207. 1925. Hsu, Fl. Taiwan 5: 704. 1978.
Themeda triandra subsp. japonica (Willd.) Koyama, Grass. Jap. Neighb. Reg. 452. 1987.
Culm slender, about 1.5 mm in diameter. Blade linear, less than 10 cm long by 3 mm wide, basal margins with glandular hairs; ligule chartaceous, 1-2 mm long, truncate, minutely ciliate on upper part and back. Spikelets paired, dimorphic, with 2 pairs of empty spikelets at base, forming a compound false panicle, interrupted by involucres; each empty spikelet covered with long glandular hairs on lower glume. The upper pedicellate, 1 /2 the width of the lower. Lower spikelet sessile, pubescent, about 5 mm long. Glumes coriaceous, as long as the spikelet: the lower linear-lanceolate, hirsute on back; the upper oblong, 2-keeled, margins inrolled and glabrous; lower lemma membranous, lanceolate, acute, about 3 mm long; upper lemma minute, membranous, about 2.5 mm long, apex prolonged into a long and hispid awn about 3.5 mm long. Caryopsis about 3 mm long, oblong; embryo linear, 1/2 the length of the caryopsis.
TAIWAN: Without locality or collectors name, Dec. 15, 1932.
Distributed in China, Korea and Japan.
This species is closely related to Themedu triandra Forssk, a widely distributed species which grows in the warm and tropical regions of the world.
midrib 中肋: (la)large:several vascular bundles
leaf surface 表面: (fla)flat surface
sclerenchyma 厚壁組織: (mistr)strand variable with size of vein
chlorenchyma 葉綠組織: (radia)cells radiate and lesser than bundle sheath cell in width
bundle sheath 維管束鞘: (sk)single bundle sheath with conspicuous chloroplast
buliform cells not well developed 泡狀細胞不發達: (smreg)epidermal cells gradually enlarge from vein to intervein
chlorenchyma cell number between two adjacent veins: 3
chloroplast form in bundle sheath 束鞘細胞內之葉綠體型式: (out)large amount and in centrifugal site
mestome sheath 內束鞘細胞: (Xyms -)metaxylem pole adjacent with outer bundle sheath
distance between two adjancent vein 脈間距: 59 micrometer
length/weidth ratio of bundle sheath in LS 束鞘細胞縱面長寬比: 3
chlorenchyma cell shape in LS 葉綠細胞縱面形狀: lobed