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Taiwan Gramineae | Family List

Poaceae (R. Brown) Barnhart

Grass Family

禾本科

Authors: Chang-Sheng Kuoh

Eremochloa ophiuroides
leaf cs section 2

Credit: cs kuoh

  • Gramineae Adans.

    Annual or perennial herbs, rather rarely with woody perennial culms (subfamily Bambusoideae); hollow or solid, septate at the nodes. Leaves two-ranked, consisting of the sheaths, ligules and the blades. Leaf-blades mostly linear and not petiolate at base, rarely with broad blades and stipitate at base (subfamily Bambusoideae); ligules membranous or ciliate, rarely lacking (Echinochloa), leaf-sheaths clothed at the internodes. Flowers bisexual or occasionally unisexual, without distinct perianth, it representing by 2 or 3 small scales, the lodicules, rarely six or sometimes absent; stamen mostly 3, rarely variable numbers, with filiform filaments and 2-celled anthers; pistil 1, ovary 1-loculed, containg 1 anatropous ovule, the style with plumose stigmas. Fruit mostly a caryopsis with rich endosperm, the embryo at the base opposite to punctiform or linear hilum which facing the palea. Flowers sessile between abaxial lemma and adaxial palea, constituting a floret. One to many florets dispoded alternatly on the oppostie sides of rachilla, in addition with a pair of empty glumes at the base forming a spikelet. Inflorescence with spikelets as an unit aggregate into panicle, raceme or spikes.

    Hsu(1974) treated 5 subfamilies (excluding Bambusoideae), 27 tribes, 118 genera, 289 species, 1 subspecies, 39 varieties, and 8 forms in Taiwan.


    subfam. 4. Eragrostioideae

    1 Spikelets with several to many fertile florets   Eragrosteae
    + Spikelets with only one fertile floret.   (2)
           
    2 (1) Glumes coriaceous and usually longer than the lemma.   (3)
    + Glumes thinner or of the same texture as the lemma, shorter than the lemma.   (5)
           
    3 (2) Inflorescence in a contracted and simplified panicle or a terminal raceme.   (4)
    + Inflorescence a spike; spikelets sunken in the rachis joints   Leptureae
           
    4 (3) Upper and lower glumes equal in length, both awned; peduncle slender and weak   Perotideae
    + Upper glumes awnless, lower glume minute or wanting; peduncle stout   Zoysieae
           
    5 (2) Spikelets cylindrical, falling entire; base of the glumes bearded; lemmas awned   Garnotieae
    + Spikelets more or less compressed; base of the glumes not bearded.   (6)
           
    6 (5) Inflorescence in digitate racemes or a terminal spike   Chlorideae
    + Inflorescence in an open or contracted panicle   Sporoboleae

    List of Keys

  • List of lower taxa


     

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