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Taiwan Gramineae | Family List | Poaceae | Chrysopogon

Chrysopogon aciculatus (Retz.) Trin., Fund. Agrost. 188. 1820. Hsu, Fl. Taiwan 5: 630. 1978; Koyama, Grass. Jap. Neighb. Reg. 434. 1987.


Chrysopogon aciculatus

Andropogon aciculatus Retz., Obs. 5: 22. 1789.

Rhaphis aciculatus (Retz.) Honda in Bot. Mag. Tokyo 40 103. 1926, Monogr. 335. 1930; Pilger in Engl., Pflanzcnf. ed. 2. 14e: 153. 1940. Perennials; culms rhizomatous and stoloniferous, long creeping, flowering culms erect. Ligule short, about 0.5 mm long. Inflorescence a panicle, 5-10 cm long, purplish, lower branches whorled; pedicelled spikelets about 6 mm long. Spikelets in threes, one sessile and perfect, the other 2 pedicellate and sterile. Sessile spikelets terete, lanceolate, about 4 mm long with a sharp, elongated callus of about 5 mm long; glume coriaceous, equal, as long as the spikelet; lower glume lanceolate, 7-nerved, upper half 2-keeled, hispidulous; lower part rounded on the back and glabrous; upper glume boat-shaped, slightly keeled and hispidulous near the apex, with a short straight awn, margins ciliate; upper lemma 1-nerved, with an awn of about 6 mm long; palea obtuse, 1/2 as long as the lemma; anthers about 1.3 mm long.

TAIPEI: Taipei City, Hsu 233*. Shiekongliao, Hsu 89. ILAN: Younshan, Kuoh 68. TAOYUAN: Neili, Hsu 123 MIAOLI: Tahu, Chen 73. TAICHUNG: Kuanglung, Hsu 9155. NANTOU: Sun Moon Lake, DeVol 7166. YUNLIN: Huwei, Hsu 276. TAINAN: Tainan, Yamamoto et al. 2339. PINGTUNG: Ssuchungchu, Hsu 1171. TAITUNG: Malan, Hsu 1012; Green Island, Sasaki s. n. May 5, 1927. HUALIEN: Tanung, Teng 14.

Widely distributed in the tropics of Asia in hills and plains. An extremely common grass in village pastures on the plains where the prostrate creeping stems resist overgrazing.

It is one of the best soil and water conservation grasses occuring on the river banks and on exposed slopes.

midrib 中肋: (sm)small:with one vascular bundle

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: (bcarc)bulliform cell with colorless cells
form an arc-shape

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: 65 micrometer

length/weidth ratio of bundle sheath in LS 束鞘細胞縱面長寬比: 2


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