Fl. Bor.-Amer. 2. 231. 1803.

Common names: Buffalo or oil nut
Etymology: Genus Pyrus and Latin -aria, connecting, alluding to pear-shaped fruit
Treatment appears in FNA Volume 12. Treatment on page 418. Mentioned on page 417.

Shrubs [trees], dioecious [polygamous]. Leaf blades herbaceous; venation brochidodromous, conspicuous. Pedicels present. Flowers: petals recurved [spreading]; nectary prolonged into scales between filament bases; styles long and cylindric (staminate flowers) or short and conic (pistillate flowers); stigma capitate, 2–3-lobed. Pseudodrupes crowned with expanded disc surrounded by swollen petal bases.


e, se United States, Asia.


Species 2 (1 in the flora).

The sexual condition in Pyrularia is not clear, which is reflected in varied descriptions. The genus has been called dioecious (M. L. Fernald 1950), subdioecious (H. A. Gleason and A. Cronquist 1991), and polygamous (Xia N. H. and M. G. Gilbert 2003). The anthers and filaments in P. pubera are smaller on pistillate flowers, do not contain pollen, and are considered staminodes. Thus, at least this species is functionally dioecious. The polygamous condition reported for the Chinese species P. edulis (Wallich) A. de Candolle requires further investigation.

Selected References


Lower Taxa