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Taiwan Gramineae | Family List | Poaceae | Digitaria

Digitaria violascens Link, Hort. Berol. 1: 229. 1827; Hsu, Fl. Taiwan 5: 549, pl. 1428. 1978.


Digitaria violascens

Credit: CC Hsu

Annuals; culm tufted, 20-50 cm tall. Blade less than 12 cm long, 3-6 mm wide; sheath mostly shorter than internode; ligule truncate, membranaceous, erose, brownish, 1-1.5 mm long. Racemes 3-9, 4-14 cm long, slender; rachis glabrous, flat, serrately winged, ca. 0.6 mm wide; pedicel terete to slightly flattened, one ca. 2 mm long and other only 0.5 mm long. Spikelets paired, elliptic, minutely covered with verrucose hairs, ca. 1.5 mm long; lower glume absent; upper glume more than 3/4 as long as spikelet, 3-veined, interveins white hairy; lower lemma as long as spikelet, veins distinct; upper lemma acute, dark brown or blackish purple at maturity.

ILAN: Kueishan, Hsu 881. TAIPEI: Hsitzu, Hsu 95; Kankou, Hsu 649. TAOYUAN: Neili, Hsu 1234. MIAOLI: Lungkang, Chuang 2587. TAICHUNG: Kukuan, Hsu 459; Nankanchi, Hsu 572. NANTOU: Chitou, Chuang 3164. CHIAYI: Alishan, Huang & Kao 1778. TAINAN: Peimen, Morimoto 670. PINGTUNG: Pingtung, Hsu 745. TAITUNG: Ansou, Hsu 1068.

Tropical regions of both hemispheres. Taiwan, weedy in sunny places.

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

leaf surface 表面: (fla)flat surface

sclerenchyma 厚壁組織: (ecstr)strand enclosed by colorless cells
and epidermis

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: 85 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: non -lobed


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  • drawing (CC Hsu)
  • Image/JPEG
  • leaf cs section (cs kuoh)
  • Image/JPEG

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