Keywords to find descriptions of mutants in the International Database for Barley Genes and Barley Genetic Stocks (bgs.nordgen.org):

Dense spike: compact spike, dense spike, dsp, erectoides, ert, lesser rachis internode number, lin, pyr, pyramidatum, pyramid shaped spike, short spike, zeo, zeocriton

Elongated spike: abr, accordion basal rachis internode, elongated basal rachis internode, lax, laxatum, lax spike, lbi, long basal rachis internodes, long spike, rac, rachisextensum, weak rachisextensum

Wilting spike: accordion rachis, accordionrachis, acr

Irregular spikes: abnormal spikes, aborted spike, absence of lower laterals, als, asp, branched spike, brc, com, compositum, crl, curled lateral spikelet, def, deformed spike, double seeds, double kernel, dub, extra central spikelet, extra floret, fertile rachilla, flo, hanging spike, irregular spikelet development, irregular spikes, lab, labile, nod, nodding spike, opposite spikelets, ops, rattail spike, rtt, snb, subnodal bract, variable rachis internode length, viv, viviparoides

Strength of spike: brittle rachis at maturity, btr, weak spikelet attachment, wsa