Redwhisker Clammyweed (Polanisia dodecandra) can be found growing in and around the Tucson area in washes and riparian areas during the summer. After the monsoon rains begin, it will become more prominent and abundant in these areas.
These weeds have a strange, rank odor and will make your hands smell if you touch them. Small glands on the foliage not only cause it to be odoriferous, but they also make it feel sticky, cold, and damp to the touch, which is why it is commonly called "Clammyweed". The flowers have 4, white petals and long, red stamens (usually twelve). The flowers are very popular with butterflies and others insects.
Redwhisker Clammyweed flowers look very similar to those of Cleome or Spider Flowers (Cleome species), which is not too surprising because they are all members of the Caper Family (Capparaceae).