Locally abundant shrub ca 1/2 m high x 1-3/4 m wide, flowers (4 pm) 42(l) x 45(w) mm, 46x45 mm, 45x56 mm, 52x55 mm, 45x46 mm, hypanthium 25x24 mm, strongly tuberculate, inner tepal 28x13.5 mm, linear oblanceolate, narrowed at base, outer and inner tepals chartreuse narrow midstripe, deep bright yellow (-yellow-chartreuse) margins, filaments yellow-chartreuse, anthers yellow, style yellow-cream, stigma lobes light chartreuse.