I was just looking these 2 up on the orchidspecies website to see if they had any scent--I was sure putidum has one and I was right, but monathum doesn't. I did find out though that putidum isn't a Bulbo. anymore, it is now Mastigion putidum (Teijsm. & Binn.) Garay, Hamer & Siegerist 1994.