monocotyledonous

The rhizome is always solid, and has the usual internal structure of the monocotyledonous stem.
Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3|Various
Ruppia, rup′i-a, n. a genus of monocotyledonous plants of the order Naiadace—to which Ditch or Tassel grass belongs.
Chambers's Twentieth Century Dictionary (part 3 of 4: N-R)|Various
The shoots and roots of grasses conform in their internal structure to the monocotyledonous type.
A Handbook of Some South Indian Grasses|Rai Bahadur K. Ranga Achariyar
In some monocotyledonous embryos, as in Orchidaceae, the embryo is a cellular mass showing no parts.
Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3|Various

The germination of a Monocotyledonous plant, with the cotyledon remaining in the ground, is shown at c.
Botany for Ladies|Jane Loudon

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