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Taiwan Gramineae | Family List | Poaceae | Dichanthium

Dichanthium aristatum (Poir.) C. E. Hubb., Kew Bull. 1939: 654. 1939. Hsu, Fl. Taiwan 5: 639. 1978; Koyama, Grass. Jap. Neighb. Reg. 445. 1987.

毛梗雙花草

Dichanthium aristatum
leaf cs section

Credit: cs kuoh

Andropogon aristatus Poir. in Lam., Encycl. Meth. Bot. Suppl. 1: 585. 1810.

Culm geniculate, about 1 mm in diameter. Blade about 8 cm long by 3 mm wide, covered with tubercled hairs; ligule chartaceous, upper part minutely fimbriate, backside hairy, about 0.6 mm long. Inflorescence of digitate racemes, racemes about 4 cm long. Spikelets paired; the upper pedicelled; the lower sessile, about 4m long. Lower glume subcoriaceous, oblong, as long as the spikelet, 8-10- nerved, lower margins inrolled, upper part 2-keeled, densely hairy on the backside, margins ciliate; upper glume subcoriaceous, elliptical, margins inrolled and fimbriate 2-grooved on the backside, about 3.6 mm long; lemma about 3 mm long, linear, 1-nerved, with a flexuous awn arising from the tip, awn about 6 times the length of the lemma; palea hyaline, lanceolate, margins inrolled, nerveless, about 3.2 mm long, pale purple. Caryopsis oblong, about 1.8 mm long; embryo 1/2 the length of the caryopsis.

TAIPEI: Taipei, Hsu A29. TAINAN: Hsinhua, Hsu 10447. PINGTUNG: Oluanpi, Hsu, 13609, Chuang 3043.

Distributed in India and now introduced into Australia, Africa and America.

This is an excellent fodder grass locally naturalized in southern Taiwan, even growing among rocks.

midrib 中肋: (la)large:several vascular bundles

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: (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: 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: 75 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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  • leaf cs section (cs kuoh)
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  • Image/GIF (CC Hsu, 1975 Taiwan Grasses)
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