acanthocereus: mostly trailing cacti having nocturnal white flowers; tropical America and Caribbean region
caryophylloid dicot genus: genus of relatively early dicotyledonous plants including mostly flowers
dalton's law: (chemistry and physics) law stating that the pressure exerted by a mixture of gases equals the sum of the partial pressures of the gases in the mixture; the pressure of a gas in a mixture equals the pressure it would exert if it occupied the same volume alone at the same temperature