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PROCEEDINGS OF THE CALIFORNIA ACADEMY OF SCIENCES 
Series 4, Volume 65, 28 Sept. 2018, No. 2 
Figure 5. Pollen of Louteridium (except for L. koelzii, which was unavailable). A. L. brevicalyx (Daniel & Steinmann 
11913). B. L. chartaceum (Daniel & Butterwick 5905). C. L. costaricense (van der Werff 7019). D. L. dendropilosum 
(Daniel et al. 11784). E. L. donnell-smithii (Daniel & Veliz 11337). F. L. mexicanum (Breedlove & Thorne 30786). 
G. L. parayi (Daniel & Wendt 5805). H. L. parayi (Breedlove & Daniel 70889) with intine protruding from apertures 
(revealing their number). I. L. purpusii (Breedlove & Smith 31613). J. L. purpusii (Breedlove & Smith 31613), with intine 
protruding from apertures (revealing their number). K. L. rzedowskianum (Kruse 1380). L. L. tamaulipense (Hutchinson 
s.n.). All scales = 10 pm. 
