Rayless Chamomile
Matricaria matricarioides (Less.) Porter
Collected on the Weippe Prairie in Clearwater Co., Idaho, on 12 Jun 1806.
Sheet PH-LC 142 (Moulton 110b), long considered a Lewis and Clark specimen,
appears to be garden material and was probably raised from seed gathered by
Thomas Nuttall in 1811. Synonymy: Santolina suaveolens Pursh. (Source)