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P.leptonema

  Habit         :Apparently shrubby, quite glabrous, branches terete firm, nodes much enlarged.
  Leaves     :Petioled, thinly coriaceous, broadly elliptic or rounded, abruptly acuminate, 5-nerved from near the rounded rarely subcordate base, very symmetrical for the genus, dull brown when dry, 7.5 - 10 by 5 - 7.5 cm., nerves slender, nervules distinct on both surfaces; petiole slender, 1.25 cm.
  Spikes      :Peduncles slender, longer than the petioles, female spikes very slender longer than the leaves. Female spikes alone seen; bracts cupular, confluent below with the slender quite glabrous rachis.
  Flowers    :Very minute in separate whorls.
  Fruits        :0.42 cm. long, ellipsoid, with a very short style when dry.