Penaea

Penaea is a genus of flowering plants in the family Penaeaceae, found in southern South Africa. They have an unusual type of embryo sac development; after two rounds of mitosis, four nuclei are formed at each pole, leading to a mature embryo sac containing four polar groups each with three cells. When found in other taxa, these embryo sacs are termed Penaea-type.

Species
Currently accepted species include:


 * Penaea acuta Thunb.
 * Penaea acutifolia A.Juss.
 * Penaea candolleana Stephens
 * Penaea cneorum Meerb.
 * Penaea dahlgrenii Rourke
 * Penaea dubia Stephens
 * Penaea ericifolia (A.Juss.) Gilg
 * Penaea ericoides (A.Juss.) Endl.
 * Penaea formosa Thunb.
 * Penaea fruticulosa L.f.
 * Penaea fucata L.
 * Penaea geneiophora Byng & Christenh.
 * Penaea gigantea (R.Dahlgren) Byng & Christenh.
 * Penaea lanceolata (R.Dahlgren) Byng & Christenh.
 * Penaea lateriflora L.f.
 * Penaea micrantha (R.Dahlgren) Byng & Christenh.
 * Penaea microphylla (Rourke) Byng & Christenh.
 * Penaea mucronata L.
 * Penaea mundii (Sond.) Byng & Christenh.
 * Penaea petraea (W.F.Barker) Byng & Christenh.
 * Penaea retzioides (Sond.) Byng & Christenh.
 * Penaea rupestris (Sond.) Byng & Christenh.
 * Penaea ruscifolia (R.Dahlgren) Byng & Christenh.
 * Penaea sarcocolla L.
 * Penaea speciosa (Sond.) Byng & Christenh.
 * Penaea sulcata (R.Dahlgren) Byng & Christenh.