Home 
SpikeletsAs noted under Synflorescence characters, we interpret the spikelet (or spikelet proper of a pseudospikelet) as a bracteate spike, which thus represents the true inflorescence in grasses (Stapleton 1997 and others). Based on this interpretation, the main axis (rachilla) of the spikelet becomes a rachis and the pedicel becomes a peduncle, so we use this terminology here. SP1. Compression of florets: 0 = terete; 1 = lateral; 2 = dorsal. SP2. Number of glumes (in femalefertile spikelets or spikelets proper): 0 = absent; 1 = one; 2 = two; 3 = three; 4 = four; 5 = five or six. SP3. Lowermost glume (glume I) development: 0 = well developed; 1 = strongly reduced, scalelike. SP4. Apex of lowermost glume: 0 = obtuse/truncate; 1 = acute; 2 = mucronate; 3 = awned. SP5. Next higher glume (glume II) development: 0 = well developed; 1 = strongly reduced, scalelike. SP6. Apex of next higher glume: 0 = obtuse/truncate; 1 = acute; 2 = mucronate; 3 = awned. SP7. Number of femalefertile florets per spikelet or spikelet proper: 0 = one; 1 = two; 2 = three or more. SP8. Floret sexuality: 0 = bisexual; 1 = unisexual. SP9. Rachis extension (internode only, with or without rudimentary floret): 0 = absent; 1 = present. SP10. Relative length of the rachis extension (internode only, with or without rudimentary floret) when present: 0 = short (shorter than or equal to about half the length of the floret); 1 = long (approximately equal to or longer than the floret). SP11. Rachis extension (internode only): 0 = glabrous; 1 = hairy. SP12. Rudimentary floret on the rachis extension: 0 = absent; 1 = present. SP13. Femalefertile lemma nerve number: 0 = 1; 1 = 3; 2 = 5 or more. SP14. Femalefertile lemma shape: 0 = navicular; 1 = spindleshaped; 2 = ellipsoid; 3 = helmetshaped. SP15. Femalefertile lemma apex shape: 0 = obtuse; 1 = acute; 2 = mucronate; 3 = awned. SP16. Femalefertile lemma apex fusion (exclusive of the awn or mucro if present): 0 = margins free; 1 = margins fused (connate). SP17. Femalefertile lemma texture: 0 = chartaceous (membranochartaceous); 1 = rigid, hardened. SP18. Palea keels: 0 = bicarinate (2keeled); 1 = 1keeled; 2 = rounded (keels not evident). SP19. Palea keel wings: 0 = absent; 1 = present. SP20. Palea apex: 0 = biapiculate (sinus shallow); 1 = tips longdivided (sinus deep); 2 = acute, not divided. SP21. Palea sulcus: 0 = well developed for full length of palea; 1 = well developed only toward the apex; 2 = absent.
Life Span and Rhizomes 

Home  Bamboos  Maps  Characters  Sampling  Collecting  Literature  Links Contact  Dr. Lynn Clark Copyright © 20052006, Iowa State University. All rights reserved. 