POLLEN MORPHOLOGY OF THE LENNOACEAE

Abstract

D rugg , W arren S. (California Res. Corp., La Habra.) Pollen morphology of the Lennoaceae. Amer. Jour. Bot. 49(10): 1027–1032. Illus. 1962.—The family Lennoaceae contains 3 genera: Pholisma, Lennoa , and Ammobroma. The pollen of Pholisma is 4‐colporate with less common 3‐ and 5‐colporate grains. Lennoa pollen is 3‐colporate with rare 4‐colporate examples. All Ammobroma pollen is 3‐colporate. Pollen of both Lennoa and Ammobroma exhibits sexine thinning in the mesocolpia with resultant depressions. This feature is lacking in Pholisma. Sculpture is reticulate‐simplibaculate on pollen of Lennoa and Pholisma , and reticulate‐duplibaculate on pollen of Ammobroma. Pollen morphology supports placement of Lennoaceae in the Polemoniales near the Boraginaceae and Hydrophyllaceae.