petiole-to-rachis (P:R) ratio

petiole-to-rachis (P:R) ratio
  Index that describes the morphometrics (in this case, the relative lengths of the petiole and rachis) of a cycad leaf (sensu Taylor et al., 2008).

Expanded glossary of Cycad terms . 2014.

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  • P:R ratio —   See petiole to rachis ratio …   Expanded glossary of Cycad terms

  • angiosperm — /an jee euh sperrm /, n. Bot. a plant having its seeds enclosed in an ovary; a flowering plant. Cf. gymnosperm. [ANGIO + SPERM] * * * ▪ plant Introduction       any member of the more than 300,000 species of flowering plants (division Anthophyta) …   Universalium

  • Populus — Taxobox name = Populus image width = 240px image caption = Foliage of Populus tremula regnum = Plantae divisio = Magnoliophyta classis = Magnoliopsida ordo = Malpighiales familia = Salicaceae genus = Populus genus authority = L. subdivision ranks …   Wikipedia