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Taiwan Gramineae | Family List | Poaceae

Panicum Linn.

黍屬

Panicum humile
drawing

Credit: CC Hsu

Annuals or perennials, in various habits. Inflorescence an open or contracted panicle, branched from all sides, rarely racemose. Spikelets pedicellate, falling entire from pedicel, terete, plano-convex, or dorselly compressed, usually muticous and glagrous, 2-flowered; glumes herbaceous, occasionally equal, usually unequal; lower glume usually not more than 1/2 as long as spikelet, 1-5 (-7)-veined or veinless; upper glume as long as spikelets, rarely shorter, usually 5-11-veined; upper lemma resembling upper glume, as long as spikelet; lower palea thinner, much shorter or absent; upper lemma glossy and smooth, or transversely rugose, rarely tuberculate, glabrous or hairy at apex, indurate at maturity, lodicules 2; stamens 3; ovary glabrous; style 2, free, stigma plumose. Caryopsis free inside upper palea and upper lemma.

A large genus of ca. 500 species distributed in tropical and warmer temperate regions of world; eleven species and one variety found in Taiwan.


1 Lower glume truncate or broadly deltoid, often with tip; 1/5-1/4 length of spikelet   Panicum dichotomiflorum
+ Lower glume not truncate, more than 1/4 length of spikelet.   (2)
       
2 (1) Upper floret ridged, triangular in cross section; lodicules thin, few veined.   (3)
+ Upper floret plano-convex or lentiform in cross section; lodicules thicker, numerously veined.   (6)
       
3 (2) Leaves linear; lower glume ca. 1/3 length of spikelet.   Panicum bisulcatum
+ Leaves ovate or lanceolate; lower glume as long as spikelet.   (4)
       
4 (3) Leaves ovate   Panicum brevifolium
+ Leaves lanceolate.   (5)
       
5 (4) Blades ciliate; lower palea absent   Panicum notatum
+ Blades not ciliate; lower palea as long as spikelet.   Panicum sarmentosum
       
6 (2) Upper florets transversely rugose   Panicum maximum
+ Upper florets not transversely rugose.   (7)
       
7 (6) Lower glume ca. 1/5 length of spikelet; upper floret plano-convex in cross section; spikelets ca. 3.5 mm long.   (8)
+ Lower glume more than 1/3 length of spikelet; upper floret lentiform in cross section   (9)
       
8 (7) Lower palea present; rhizomatous; culm hard.   Panicum repens
+ Lower palea absent; not rhizomatous; culm spongy   Panicum paludosum
       
9 (7) Spikelets ca. 1.5 mm long, usually reddish   Panicum humile
+ Spikelets more than 2 mm long.   (10)
       
10 (9) Plants covered with tubercle-based hairs.   (11)
+ Plants not covered with tubercle-based hairs.   Panicum sumatrense
       
11 (10) Veins of glumes and lower lemma anastomosing   Panicum luzonense
+ Veins of glumes and lower lemma not anastomosing.   (12)
       
12 (11) Lower lemma 7-veined; wild   Panicum curviflorum var. suishaense
+ Lower lemma 11-veined; cultivated   Panicum miliaceum

  • List of lower taxa


     

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