Racemobambos Holttum, Davidse & Zuloaga
  • Gard. Bull. Singapore 15: 268 (1956) 


General Description

HABIT Perennial. Rhizomes absent (14), or elongated (5); pachymorph (5/5). Culms erect (2/15), or leaning (7/15), or scandent (9/15); 300-1280-2600 cm long; woody. Culm-internodes terete. Culm-nodes flush with internodes (9/9). Lateral branches dendroid. Branch complement two (1/18), or three (4/18), or several (12/18), or many (8/18); in a clump (4/4); with subequal branches (5/12), or 1 branch dominant (10/12); as thick as stem (1/1). Culm-sheaths deciduous (11/11); without auricles (15/15). Culm-sheath blade linear (1/7), or lanceolate (5/7), or triangular (1/7); as wide as sheath at base (1/1). Ligule an eciliate membrane (15), or a ciliolate membrane (4). Leaf-blade base without a false petiole (1), or with a brief petiole-like connection to sheath (18). Leaf-blades linear (6), or lanceolate (14); stiff (1), or firm (18). INFLORESCENCE Inflorescence a panicle (7/18), or composed of racemes (11/18); exserted (16/18), or embraced at base by subtending leaf (2/18). Panicle open (5/5). Racemes single (11/11); paucilateral (10/10); bearing few fertile spikelets (11/11); bearing 2 fertile spikelets on each (3/10), or 3 fertile spikelets on each (6/10), or 4 fertile spikelets on each (8/10), or 5 fertile spikelets on each (6/10), or 6-8 fertile spikelets on each (2/10). Spikelets solitary (18/18). Fertile spikelets sessile (2/18), or sessile and pedicelled (2/18), or pedicelled (14/18). FERTILE SPIKELETS Spikelets comprising 2 fertile florets (1/18), or 3 fertile florets (5/18), or 4 fertile florets (10/18), or 5 fertile florets (13/18), or 6 fertile florets (8/18), or 7 fertile florets (4/18), or 8 fertile florets (3/18); with diminished florets at the apex (18/18). Spikelets linear (3/18), or lanceolate (13/18), or elliptic (2/18), or oblong (2/18); laterally compressed (18/18); 10-28.59-60 mm long; breaking up at maturity (18/18); disarticulating below each fertile floret (18/18). Rhachilla internodes glabrous (13/18), or pubescent (5/18). GLUMES Glumes one the lower absent or obscure (1/18), or two (11/18), or several (6/18); persistent (18/18); shorter than spikelet (18/18). Lower glume lanceolate (4/8), or ovate (4/8); 0.25-0.568-0.75 length of upper glume; membranous (5/5); without keels (5/6), or 1-keeled (1/6); 1 -veined (3/4), or 5 -veined (1/4). Lower glume lateral veins absent (3/17), or distinct (14/17). Lower glume surface glabrous (15/17), or puberulous (2/17), or pubescent (1/17). Lower glume apex acute (5/6), or acuminate (1/6), or attenuate (1/6). Upper glume ovate (9/9); 0.6-0.802-1.1 length of adjacent fertile lemma; membranous (5/5); without keels (5/5); 5 -veined (1/8), or 7 -veined (5/8), or 9-10 -veined (1/8). Upper glume surface glabrous (16/18), or puberulous (1/18), or pubescent (1/18). Upper glume apex obtuse (1/9), or acute (6/9), or acuminate (2/9); muticous (8/9), or mucronate (1/9). FLORETS Fertile lemma ovate (18/18); membranous (5/18), or chartaceous (12/18), or coriaceous (1/18); without keel (18/18); 5 -veined (1/7), or 7 -veined (4/7), or 8-9 -veined (2/7), or 10-11 -veined (1/7). Lemma surface glabrous (13/18), or puberulous (2/18), or pubescent (4/18), or hirsute (1/18). Lemma margins eciliate (11/18), or ciliolate (1/18), or ciliate (2/18), or pubescent (4/18). Lemma apex acute (4/9), or acuminate (4/9), or setaceously attenuate (1/9); muticous (15/18), or mucronate (3/18). Palea 6-6.5-7 length of lemma; 2 -veined (3/9), or 3 -veined (1/9), or 4-6 -veined (2/9), or 7 -veined (1/9), or 8 -veined (3/9), or 9-10 -veined (2/9); 2-keeled but the uppermost without keels (1/18), or 2-keeled (17/18). Palea keels eciliate (10/18), or pubescent (1/18), or ciliolate (6/18), or ciliate (1/18). Palea surface glabrous (11/18), or puberulous (2/18), or pubescent (6/18). Palea apex dentate (1/1). Apical sterile florets resembling fertile though underdeveloped (14/18), or distinct from fertile (4/18); 1 in number (4/4); rudimentary (4/4). FLOWER Lodicules absent (1/18), or 3 (17/18); glabrous (9/17), or ciliate (8/17). Anthers 6 (18/18). Stigmas 3 (18/18). Ovary unappendaged (1/18), or umbonate (17/18); glabrous (1/18), or with a few apical hairs (1/18), or pubescent on apex (16/18). FRUIT Caryopsis with adherent pericarp (18/18). DISTRIBUTION Tropical Asia.

  Bibliography

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