- 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.
petiole-to-rachis (P:R) ratio
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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
