B. arvensis, L.
There are several varieties, of which B. secalinus with a looser panicle, and B. mollis with a more compact panicle and very downy, are the chief.
≡ ≡ Spikelets lanceolate and with conspicuous awns. Nerves on the paleæ obsolete.
x Panicle conspicuously loose and drooping and awns long, paleæ narrow and elongated.
z Sheaths with long often reflexed hairs. A shade-grass over three feet high.
B. asper, Mull.
zz Sheaths downy. A weed of open lands and hedges, two feet or less.
B. sterilis, L.
B. giganteus is rarer than B. asper and has smaller spikelets and more slender awns. B. maximus and B. madritensis are rare.