What does it look like? Are the veins in its leaves more or less parallel? (rather than branched) Does it have fibrous roots? (no taproot) Does it have a flower like a lily or does its flower have three petals (rather than five or many) Does its seed contain one seed leaf or cotyledon? (rather trhan two) If the answers are "yes" it could be a monocot.
monocot because its veins are parallel
Corn is a monocot. A monocot has one cotyledon, which means there is only one leaf present in the seed.
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Coffee and tea plants are both dicotyledonic.
A pea plant is a dicotyledon (dicot).
dicot
Euphorbia albomarginata was created in 1857.
Euphorbia skottsbergii was created in 1936.
Euphorbia thulinii was created in 1992.
Euphorbia rockii was created in 1909.
Euphorbia grantii was created in 1875.
Euphorbia halemanui was created in 1936.
Euphorbia eleanoriae was created in 2000.
Euphorbia epithymoides was created in 1762.
Euphorbia chamaesyce was created in 1753.
Euphorbia haeleeleana was created in 1971.
Euphorbia herbstii was created in 1988.