Question: Which pseudo cereal was a staple of the Aztec empire?
About the article "Cereal", section "Production".

Candidate passages:
The genus Pseudo-nitzschia includes several species of diatoms known to produce the neurotoxin known as domoic acid, a toxin which is responsible for the human illness called amnesic shellfish poisoning.
This genus of phytoplankton is known to form harmful algal blooms in coastal waters of Canada, California, Oregon, Washington state, Europe, Asia, Australia, New Zealand, Central America, and South America.
The general biology, physiology, toxicity and distribution of "Pseudo-nitzschia" species is reviewed in Bates and Trainer (2006), Trainer et al.
(2008), Lelong et al.
(2012) and Trainer et al.
Up until 1994, the genus was known as "Nitzschia", but was changed to "Pseudo-nitzschia" because of the ability to form chains of cells with overlapping tips as well as other minor morphological differences.
and Bates (2000).
Known species of "Pseudo-nitzschia" (43): "Pseudo-nitzschia abrensis" "Pseudo-nitzschia americana" "Pseudo-nitzschia antarctica" "Pseudo-nitzschia arenysensis" "Pseudo-nitzschia australis" "Pseudo-nitzschia batesiana" "Pseudo-nitzschia brasiliana" "Pseudo-nitzschia caciantha" "Pseudo-nitzschia calliantha" "Pseudo-nitzschia circumpora" "Pseudo-nitzschia cuspidata" "Pseudo-nitzschia decipiens" "Pseudo-nitzschia delicatissima" "Pseudo-nitzschia dolorosa" "Pseudo-nitzschia fukuyoi" "Pseudo-nitzschia fraudulenta" "Pseudo-nitzschia fryxelliana" "Pseudo-nitzschia galaxiae" "Pseudo-nitzschia granii" "Pseudo-nitzschia hasleana" "Pseudo-nitzschia heimii" "Pseudo-nitzschia inflatula" "Pseudo-nitzschia linea" "Pseudo-nitzschia lineola" "Pseudo-nitzschia lundholmiae" "Pseudo-nitzschia mannii" "Pseudo-nitzschia micropora" "Pseudo-nitzschia multiseries" "Pseudo-nitzschia multistriata" "Pseudo-nitzschia obtusa" "Pseudo-nitzschia plurisecta" "Pseudo-nitzschia prolongatoides" "Pseudo-nitzschia pseudodelicatissima" "Pseudo-nitzschia pungens" "Pseudo-nitzschia pungiformis" "Pseudo-nitzschia roundii" "Pseudo-nitzschia seriata" "Pseudo-nitzschia sinica" "Pseudo-nitzschia subcurvata" "Pseudo-nitzschia subfraudulenta" "Pseudo-nitzschia subpacifica" "Pseudo-nitzschia turgidula" "Pseudo-nitzschia turgiduloides" Light and electron microscope images of "Pseudo-nitzschia" species are shown at the Nordic Microalgae website.
"Pseudo-nitzschia" species that have been shown to produce domoic acid (15), although not all strains are toxigenic: "Pseudo-nitzschia brasiliana" "Pseudo-nitzschia australis" "Pseudo-nitzschia calliantha" "Pseudo-nitzschia cuspidata" "Pseudo-nitzschia delicatissima" "Pseudo-nitzschia fraudulenta" "Pseudo-nitzschia galaxiae" "Pseudo-nitzschia granii" "Pseudo-nitzschia multiseries" "Pseudo-nitzschia multistriata" "Pseudo-nitzschia pungens" "Pseudo-nitzschia pseudodelicatissima" "Pseudo-nitzschia seriata" "Pseudo-nitzschia subpacifica" "Pseudo-nitzschia turgidula"  
Aztec philosophy was the school of philosophy developed by the Aztec Empire.
The Aztecs had a well-developed school of philosophy, perhaps the most developed in the Americas and in many ways comparable to Greek philosophy, even amassing more texts than the ancient Greeks.
Aztec philosophy focused on dualism, monism, and aesthetics, and Aztec philosophers attempted to answer the main Aztec philosophical question of how to gain stability and balance in an ephemeral world. 
  "Aztec" (1980) : A story of the Aztec empire just before and during the arrival of the Spanish.
"Aztec Autumn" (1997), a story of the Aztecs following the Spanish conquest.
Aztec series.
Additional books in the series ("Aztec Blood", 2002; "Aztec Rage", 2006; "Aztec Fire", 2008, "Aztec Revenge", 2012) were written by Robert Gleason, Jennings' former editor, and Junius Podrug, working from notes left by Jennings. 
The following table shows the annual production of cereals in 1961, 2010, 2011, and 2012 ranked by 2012 production.
All but buckwheat and quinoa are true grasses (these two are pseudocereals).
Maize, wheat, and rice together accounted for 89% of all cereal production worldwide in 2012, and 43% of all food calories in 2009, while the production of oats and triticale have drastically fallen from their 1960s levels.
Other grains that are important in some places, but that have little production globally (and are not included in FAO statistics), include:
 Teff, an ancient grain that is a staple in Ethiopia.
It is high in fiber and protein.
Its flour is often used to make injera.
It can also be eaten as a warm breakfast cereal similar to farina with a chocolate or nutty flavor.
Its flour and whole grain products can usually be found in natural foods stores.
 Wild rice, grown in small amounts in North America.
 Amaranth, an ancient pseudocereal, formerly a staple crop of the Aztec Empire and now widely grown in Africa.
 Kañiwa, close relative of quinoa.
Several other species of wheat have also been domesticated, some very early in the history of agriculture:
 Spelt, a close relative of common wheat.
 Einkorn, a wheat species with a single grain.
 Emmer, one of the first crops domesticated in the Fertile Crescent.
 Durum, the only tetraploid species of wheat currently cultivated, used to make semolina.
 Kamut, an ancient relative of durum with an unknown history.
The ISO has published a series of standards regarding cereal products which are covered by ICS 67.060.