A rare occurrence of seed formation on male branches of the dioecious tree, populus deltoides

The American Midland Naturalist | January 1, 2002| | Copyright

ABSTRACT.-We observed formation of female flowers and seedpods, subsequent to the production of male flowers and pollen, on branch cuttings from a male Populus deltoides var. wislizenii tree. Labile sex expression is rare in the genus Populus, and this is the only recorded instance for this variety of P. deltoides. Mature trees exhibited the same phenomenon in the field and some released copious amounts of seed during 1997. These observations may explain apparent sexual lability within four populations of P. deltoides along the Rio Grande. If protandrous hermaphrodites exist in this species, ...

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