If you're able to go above and beyond to help us during this important time, please consider making an additional financial contribution. Click here to contribute. A smelly plant has taken root in the community, and the stench isnât the only thing thatâs worrisome. Stinknet (Oncosiphon piluliferum), also called Globe Chamomile, is a noxious and invasive weed species that has rapidly spread throughout Arizona over the last decade, and has recently invaded urban and rural areas of Pima County. Though the infestation is not rampant, health officials and conservationists agree that Pima County is at a critical stage of controlling the spread. If the spring blooming annual continues to grow unchecked, it could pose a huge threat to public health and the environment â outcompeting native plants, releasing toxic allergens into the air, and increasing the risk and magnitude of wildland fires.