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Taiwan Gramineae | Family List | Poaceae

Agrostis L.

翦股穎屬

Agrostis rigidula var. formosana
specimen

Credit: cs kuoh

Annua or perennial. Ligules membranous. Spikelets in panicles, laterally compressed, 1-flowered, articulating above the glumes. Glumes more or less long-persistent, subequal, membranous, usually 1-nerved, keeled, keel usually scabrouos, acute to acuminate. Rachilla process usually absent, or microscopic. Lemma membranous to scarious, thinner and usually distinctly shorter than the glumes, rounded on the back, 5-, rarely 3-nerved, muticous or dorsally awned, apex more or less truncate to 4- or 5-dentate, callus glabrous or laterally short-hairy. Palea shorter to much shorter than the lemma, then sometimes inconspicuous, 2-nerved when long. Lodicules 2, free, thin, veinless, glabrous. Anthers usually 3. Styles 2, free at base; stigmas emerging laterally at anthesis. Caryopsis dorsally grooved to terete; hilum subbasal, punctiform; embryo small.

Species 150-200.Worldwide in temperate areas and on tropical mountains.

翦股穎屬台灣有三種。依Veldkamp報告A. rigidula分為四個變種。差別在小花各部位長短比例的變化。此屬有待深入研究。

Veldkamp, J. F. 1982. Agrostis (Gramineae) in Malesia and Taiwan. Blumea 28(1): 199- 228.


KEY TO SPECIES AND VARIETY

1 Awn usually present. Palea usually 0.3--0.5 mm long, 0.25-0.33 times as long as the lemma. Anthers 1-1.2 mm long, 0.54-0.73 times as long as the lemma   var. formosana
+ Awn absent.   (2)
       
2 (1) Palea 0.15-0.5 mm long.   (3)
+ Palea 0.5-0.85 mm long.   (4)
       
3 (2) Anthers 0.2-0.5 mm long. Lemma 1.25-1.6 mm long. Callus more or less glabrous. Palea 0.25-0.5 mm long, 0.13-0.36 times as long as the lemma. Anthers 0.15-0.4 times as long as the lemma.   Agrostis clavata
+ Anthers 0.5-1 mm long. Lemmas 1.5-1.8 mm long. Callus usually puberulous. Palea 0.15-0.3 mm long, 0.1-0.17 times as long as the lemma. Anthers 0.33-0.57 times as long as the lemma.   var. rigidula
       
4 (2) Panicle contracted, up to 3 cm wide, densely spikeled. Lower glume 2-2.35 mm long. Callus usually glabrous. Anthers 0.6-0.7 mm long. 0.38-0.47 times as long as the lemma.   var. arisan-montana
+ Panicle effuse, up to 8 cm wide, loosely spikeled. Lower glume 1.5-2 mm long. Callus puberulous. Anthers 0.8-1.1 mm long, 0.55-0.73 times as long as the lemma.   var. fukuyamae

Lower Taxa


 

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