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Key to families | Table of families and genera
1. Leaf base oblique-cordate; fruits 1–2 per catkin, not winged, each enclosed in a papery involucre of 2 fused bracts; pistillate calyx present, ovary inferior ..... CORYLUS
1' Leaf base subcordate, rounded, ± truncate, or tapered; fruits many per catkin, winged, each subtended but not enclosed by 1 bract; pistillate calyx 0, ovary superior
2. Pistillate catkin cone-like, with woody bracts remaining attached after fruit release ..... ALNUS
2' Pistillate catkin not cone-like, with papery, lobed bracts released with but not attached to fruit ..... BETULA
Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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