1 Leaves distant on the stem, stem visible, short-lanceolate to ligulate, not slightly constricted above base, apex narrowly to broadly acute, costa percurrent in distal leaves into a clear sharp cell … A. aestivum
1 Leaves dense, crowded on the stem, stem not visible, long-lanceolate to linear-elliptic, constricted above base, apex narrowly acute to acuminate, costa excurrent into a short or long, stout mucro of several cells … A. stracheyanum