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Taiwan Gramineae | Family List | Poaceae | Pennisetum

Pennisetum purpureum Schumach., Beskr. Guin. Pl. 44. 1827; Hsu, Fl. Taiwan 5: 592. 1978.

象草

Pennisetum purpureum
drawing

Credit: CC Hsu

Perennials; clums erect, tall, to 3 m high. Ligule with cilia 3 mm long. Inflorescence a cylindrical contracted panicle, ca. 15 mm long, main axis densely hairy. Spikelets 2-flowered, ca. 5 mm long, solitary, subsessile, subrrounded by an involucre of bristles, falling off together with spikelet when mature; glume deltoid, 1/4 as long as spikelet; lower lemma lanceolate, membranaceous, minutely hispidulous, margins ciliate, as long as spikelet, 5-veined, palea absent; upper lemma lanceolate in back view, membranaceous, minutely hispidulous, lower half indurate, glabrous, 5-veined, palea of similar texture, 2- veined; anthers 3, with a tuft of hairs at one end.

TAIPEI: Yangmingshan, Hsu 9165. PINGTUNG: Kenting, Hsu s. n.

Originally from tropical Africa, but now introduced into many other tropical countries. Taiwan, in open areas.

leaf surface 表面: (fla)flat surface

sclerenchyma 厚壁組織: (mistr)strand variable with size 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: (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: (per)large amount and in peripheral 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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