Glossary

Category: P

  • Ptyxis

    Leaf folding within the bud; aestivation is similar but for sepals and petals.  

  • Pterospermous

    With winged seed.  

  • Pterocaulous

    With winged stem [unusual term].  

  • Pterocarpous

    Pterocarpous

    With winged fruit.  

  • Pteridophyte

    Pteridophyte

    A fern or fern-ally; member of a group of plants with alternating generations, the main generation producing spores. Colloquial term used for all seedless vascular plants, e.g. lycopods and ferns, a polyphyletic assemblage. A large class of plants, some fossil members of which were among the earliest land plants, characterized by a lack of seeds…

  • Psilate

    (Of pollen) without sculpturing on the surface.  

  • Pseudowhorl

    Leaves arranged one per node, but the nodes so short and close together so as to give the impression of a whorl of leaves. A stem with the leaves singly per node, but the internodes being so short that it resembles a whorl.  

  • Pseudoverticillate

    Appearing whorled or verticillate but not actually so.  

  • Pseudoterminal

    Looking as if terminal but really axillary; for example, a pseudoterminal bud is formed where a lateral bud replaces a terminal bud that is damaged or lost.  

  • Pseudostipule

    (In compound leaves) the lowermost leaflet if and when it is very close to the stem and the leaf insertion point.