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Taiwan Gramineae | Family List | Poaceae | Dactyloctenium

Dactyloctenium aegyptium (L.) Beauv., Ess. Agrost. 15. 1812. Hsu, Fl. Taiwan 5: 471. 1978; Koyama, Grass. Jap. Neighb. Reg. 269. 1987.

龍爪茅

Dactyloctenium aegyptium
leaf cs section

Credit: cs kuoh

Cynosurus aegyptius L., Sp. Pl. 72. 1753.

Inflorescence of 2-7, usually 4, stout digitate spikes. Spikelets usually 3-flowered, 3-4 mm long; glumes keeled, the keel hirsute, 1-nerved; lower glume with an awn of 1-2 mm long, semi-ovate in side view, pointed, about 2.5 mm long, upper glume as long as the lower glume, with a slightly curved strong awn of about 1 mm long; lemma keeled, pointed, oblong-ovate in side view, 3 mm long, 3-nerved, lateral nerves close to the margins; anthers 3, about 0.5 mm long. Utricles globose, rugose, about 1 mm long.

TAIPEI: Shihmen, Hsu 1275; Chinshan, Hsu 1278. ILAN: Suao, Kuoh 1728. MIAOLI: Tahu, Cheng 79. TAICHUNG: Fantsuliao, Hsu 9146. CHANGHUA: Lukang, Kuoh 1640; Chihu, Hsu 4719. NANTOU: Sun Moon Lake, Moo 2074. CHIAYI: Chiayi, De Vo1 7094; Hsinkang, Hsu 294. YUNLIN: Huwei, Kao & Hsu 268; Mailiao, Hsu 20150, TAINAN: Hsinhua, Hsu 702. KAOHSIUNG: Kaohsiung, Hsu s. n. June 9, 1968. PENGHU: Penghu, Hsu 673. PINGTUNG: Hengchun, Wang 12722. Chiuchutan, Chuang 1532*. TAITUNG: Tawu, Hsu 978; Botel Tobago, Hsu 9361; Green Island, Hsieh s. n. Oct. 9, 1975.

Distributed in the tropical regions of the Old World.

This grass is said to be rich in cyanogenetic glycoside and thefore is a danger to stock at certain times. It is found usually in sandy soils.

leaf surface 表面: (fla)flat surface

sclerenchyma 厚壁組織: (abscl)on abaxial side of vein

chlorenchyma 葉綠組織: (radia)cells radiate and lesser than
bundle sheath cell in width

bundle sheath 維管束鞘: (dko)two bundle sheaths the outer one
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: (bchal)bulliform sets connect with colorless cells
in long row

chlorenchyma cell number between two adjacent veins: 2

chloroplast form in bundle sheath 束鞘細胞內之葉綠體型式: (per)large amount and in peripheral site

mestome sheath 內束鞘細胞: (Xyms+)metaxylem pole adjacent with
mestome sheath

distance between two adjancent vein 脈間距: 98 micrometer

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

chlorenchyma cell shape in LS 葉綠細胞縱面形狀: lobed


 

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