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Subspecies
Published in Rhodora, in 1942, in volume 44, pages 157-167
Berula pusilla (Nutt.), comb. nov. Sium pusillum Nutt. in Torr. & Gray, Fl. N. Am. i. 611 (1840). S.? incisum Torrey in Fremont, Rep. Expl. Rocky Mts. 90 (1845). S. angustifolium sensu Am. auth., not L. B. augustifolia sensu Am. auth., not Mert. & Koch. B. erecta sensu Coville in Contrib. U. S. Nat. Herb. iv. 115 (1893), not Sium erectum Hudson, basinym. S. Novae-Mexicae Koso-Poljansky in Bull. Soc. Nat. Moscou, n. s. xxvii. 173 (1915)
Published in Rhodora, in 1942, in volume 44, issue 521, pages 189-191