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Taiwan Gramineae | Family List | Poaceae | Pennisetum

Pennisetum polystachion (L.) Schult., Mant. 2: 146. 1824.


Pennisetum polystachion
leaf cs section-2

Credit: cs kuoh

  • Pennisetum setosum (Swartz) L. C. Rich.

    Perennials; rhizome short. Culms tufted, 50-150 cm high; flowering clums arising from nodes below middle part; peduncle hairy. Blade 3-15 mm wide; ligule a ring of long hairs, ca. 1 mm long; sheath loose, hispid, margin ciliated, old remains persistent. Panicle contracted, 10-25 cm long, yellow to purplish, spikelets reflexed when mature. Bristles unequal, outer ones shorter, inner ones feathery, to 1 cm long. Spikelets ca. 3 mm long, ovate-lanceolate, more or less pubescent; lower glume reduced; upper glume and lower lemma subequal to spikelet, 5-veined, fringed at summit, ovate-elliptic; lower lemma enclosing lower palea of same length, lower palea with hairs at tip and on keels; upper floret cartilaginous, ca. 2 mm long; lodicule absent, anthers ca. 2 mm long.

    MIAOLI: Tapu, Hsu s. n. TAINAN: Hsinhua, Hsu & Wang 10446. KAOHSIUNG: Tashu, Hsu & Lin 6623.

    Originally from tropical America and Africa, but now introduced to many countries. Taiwan, hillsides in the central and southern parts.

    leaf surface 表面: (sha)upper surface with shallow notch
    between the veins

    sclerenchyma 厚壁組織: (trstr)strand trichome-like

    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: 100 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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