We concur with Cronquist (Interm. Fl. 5: 138. 1994) that Matricaria matricarioides is not superfluous as suggested by Rauschert (1974) and therefore we regard M. discoidea to be a later name. The problem is complicated by the possible existence of an even earlier name for the species, M. chamomilla L. (Sp. Pl.: 891. 1753), which has been consistently misapplied to another species of the genus. Until the nomenclatural morass is resolved, it seems better to maintain M. matricarioides rather than adopt M. discoidea or take up what under the current rules is correct, M. chamomilla. Meehan (1898: 34) and Moulton (in press) use M. discoidea. The lectotype was supposedly collected on the Weippe Prairie in Clearwater Co., Idaho. This does not entirely correspond to the location given by Pursh as "On the banks of the Kooskoosky. . . . June-Aug.," but it does correspond in part to the label data: "On the Kooskooskie / Jun: 12th- 1806." We are cautious here because Pursh also indicates he saw live material, and adds "Aug." to the date of flowering. A comparison of PH-LC 141 and 142 raises some question as to the authenticity of 142 as an original Lewis and Clark collection even though it is labeled as such. On the four fragments on this Lambert sheet, the middle two appear to be similar to that found on 141, the American Philosophical Society sheet. However, the outer two fragments have the distinct appearance of a garden collection, that presumably were raised from seeds taken from the original Lewis and Clark fragments. M'Mahon raised live material in Philadelphia (see the Collins sheet preserved in the Muhlenberg Herbarium at PH), and it is possible that Pursh is alluding to this material. The fragments on the Collins sheet look nothing like the possible garden specimens on PH-LC 142. We are not suggesting, at this time, that only the two middle fragments should be established as the lectotype; we leave that to a future monographer. Pursh used this sheet to establish the name, and it is that fact that we acknowledge by our designation of a lectotype. (The Lewis & Clark Herbarium Digital Imagery Study Set, ANSP, 2002) On deposit at the Academy of Natural Sciences, Philadelphia Collected by:Meriwether Lewis & William Clark Collection date:06/12/1806