Hemerocallis vespertina, a
perennial herb found in grasslands in mountainous regions, emerges
leaves in two rows at the bases, each linear, 40-60cm in length,
5-15mm in width. Flower stalks measure 1-1.5m in height; the
inflorescences branch in two parts; flowers bloom from one to
another in the evening and fade in the morning the next day. The
perianths are light yellow, visible to night-flying insects like
moths. Bloom time: July-September.