Here is one instance of how a family is classified.
"Phenylpropanoids and related curcumins, ethereal oils +; SiO2 usu. as sand; (vessels also in stem); sieve elements with nuclear non-dispersive crystalline protein bodies; oil cells +; (hairs with sunken bases); plane of distichy parallel to the rhizome, (leaf sheath closed); vascular bundles in leaf axis abaxial; hypodermis 0-1-layered; inflorescence branched; (inflorescence bracts deciduous); labellum from two lateral staminodes of inner whorl, 2 staminodes of inner whorl petaloid, ?free from labellum, median A of outer whorl 0; nectaries 2, on top of ovary; ovules (1-)many/carpel, nucellar cap +, hypostase common; capsule fleshy; exotesta of fibriform cells; chalazosperm 0; n = 8-14+; seedling collar not prominent." (Mobot.org)
from source: http://www.mobot.org/mobot/research/apweb/
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