Pseudognaphalium

All our species have glandular foliage and a prominent sweet balsamic odor.

1. Leaves decurrent (stem with 2 short wings of leaf tissue extending beneath each node); stems (at least on the less tomentose middle and lower internodes) with evident spreading glandular hairs all or mostly 0.3–0.7 mm long.

P. macounii

1. Leaves not decurrent; stems with glandular hairs, if any, at most ca. 0.2 mm long, usually not evident.

2. Stems green, with evident but tiny (ca. 0.2 mm or less) gland-tipped hairs.

P. micradenium

2. Stems with white tomentum, concealing any glands.

P. obtusifolium

All species found in Pseudognaphalium

Pseudognaphalium macouniiCLAMMY CUDWEED 
Pseudognaphalium micradeniumCUDWEED 
Pseudognaphalium obtusifoliumFRAGRANT CUDWEED, OLD-FIELD BALSAM 

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 14, 2017. http://www.michiganflora.net/genus.aspx?id=Pseudognaphalium.