Thyrsostachys Gamble
  • Indian Forester 20: 1 (1896) 

General Description

HABIT Perennial. Rhizomes short; pachymorph. Culms erect; 700-1500-2500 cm long; woody. Culm-internodes terete. Lateral branches dendroid. Branch complement many; in a horizontal line; with 1 branch dominant; thinner than stem. Culm-sheaths persistent; without auricles. Culm-sheath blade linear (1), or triangular (1). Ligule an eciliate membrane (1), or a ciliolate membrane (1). Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades deciduous at the ligule; lanceolate. INFLORESCENCE Synflorescence bractiferous; linear (1), or fasciculate (1); with spathaceous subtending bracts; with axillary buds at base of spikelet. Fertile spikelets sessile. FERTILE SPIKELETS Spikelets comprising 2 fertile florets, or 3 fertile florets (1); with a barren rhachilla extension. Spikelets lanceolate (1), or ovate (1); laterally compressed; 12-17.87-25 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes glabrous (1), or pubescent (1). GLUMES Glumes persistent; shorter than spikelet. Lower glume oblong (1), or ovate (1); 0.7-0.825-1 length of upper glume; membranous; without keels; 9 -veined (1), or 11-13 -veined (1). Lower glume surface pubescent. Lower glume apex acute. Upper glume oblong (1), or ovate (1); 0.5-0.8125-1 length of adjacent fertile lemma; membranous; without keels; 9 -veined (1), or 12-13 -veined (1). Upper glume lateral veins with cross-veins (1/1). Upper glume surface pubescent. Upper glume apex acute. FLORETS Fertile lemma oblong; membranous; without keel; 9-12 -veined (1), or 13 -veined, or 14-19 -veined (1). Lemma surface pubescent. Lemma apex acute. Palea 1 length of lemma; membranous (1), or chartaceous (1); 3-5 -veined (1), or 7-9 -veined (1); 2-keeled but the uppermost without keels (1), or 2-keeled (1). Palea keels ciliate. Palea surface glabrous (1), or pubescent (1). Palea apex dentate, or lobed. FLOWER Lodicules absent (1), or 2 (1); ciliate (1/1); acute (1/1). Anthers 6. Stigmas 1 (1), or 3 (1). Ovary umbonate; glabrous. FRUIT Caryopsis with adherent pericarp. DISTRIBUTION Temperate Asia, or Tropical Asia.


  • 1 Govaerts, R.H.A. (2011). World checklist of selected plant families published update. Facilitated by the Trustees of the Royal Botanic Gardens, Kew.

 Information From

GrassBase - The Online World Grass Flora
Clayton, W.D., Vorontsova, M.S., Harman, K.T. and Williamson, H. (2006 onwards). GrassBase - The Online World Grass Flora. [accessed 24 January 2012; 14:30 GMT]
  • A © Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
eMonocot. (2010, 1st November). Retrieved Wednesday, 8th February, 2012, from
  • B Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
World Checklist of Selected Plant Families
WCSP 2014. 'World Checklist of Selected Plant Families. Facilitated by the Royal Botanic Gardens, Kew. Published on the Internet; Retrieved 2011 onwards
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