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Taiwan Gramineae | Family List | Poaceae | Heteropogon

Heteropogon contortus (L.) Beauv. ex Roem. & Schult., Syst. Veg. 2: 836. 1817. Hsu, Fl. Taiwan 5: 659. 1978; Koyama, Grass. Jap. Neighb. Reg.452. 1987.


Heteropogon contortus
living plant

Credit: CS Kuoh

Andropogon corctortus L., Sp, Pl. 1045. 1753.
Heteropogon contortus Beauv. var. hispidissimus Honda, Bot. Mag. Tokyo 40: 105. 1926. Monogr. 336. 1930.

Rhizome stout. Culms up to 60 cm high. Blades up to 15 cm long, scabrous; ligule ciliate, about 1 mm long; sheath compressed and keeled, longer than the internode. Raceme single, 3-6 cm long. Spikelets paired, basal 3-10 spikelets imbricate, sterile, persistent and awnless; upper 10 spikelets paired, one pedicellate, the other sessile. Sessile spikelets about 7 mm long, cylindrical, covered with brown hairs, awned from the summit, the awn long and stout; callus sharp pointed, about 2 mm long; glumes coriaceous, rounded on the back; upper glume 2-nerved, margins membranous; upper lemma linear, membranous, tipped with a genicula awn of 10 cm long, column twisted and hairy.

TAIPEI: Kankou, Sasaki 380284. CHANGHUA: Pahkuashan, Hsu 11239. TAINAN: Hsinhua, Hsu 13666. KAOHSIUNG: Fengshan, Chuang 4159. TAITUNG: Taitung, Suzuki s n. Oct. 17, 1934.

Widely distributed in the tropics, ascending in the Himalaya to 2,000 m.

Locally this grass is usually found in the southern parts of Taiwan along railways.

midrib 中肋: (la)large:several vascular bundles

leaf surface 表面: (fla)flat surface

sclerenchyma 厚壁組織: (noscl)no except large 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 well developed 泡狀細胞發達: mainly appear in adaxial side

with small vein under buliform cells泡狀細胞下有小脈: (fansh)bulliform set shell-shaped or fan -shaped

chlorenchyma cell number between two adjacent veins: 2

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: 50 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


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