Fl. rounded, 106 mm wide; perianth segments very broad, blunt, mucronate, white, slightly reflexed, plane, with margins incurved at apex, smooth and of heavy substance, overlapping; the inner segments broadly ovate, not noticeably mucronate, more nearly spreading, with margins plane; corona bowl-shaped, ribbed, deep lemon yellow, with green at base, mouth expanded, lobed, frilled.

Named for the Duncan’s grand-daughter, Jasmin. She pronounced her name ‘Jammin’.