In heterosporous plants, a sporangium that produces megaspores . In heterosporous plants, a sporangium that produces microspores .Usually morphologically distinct from the megasporangium . Generally, large numbers of microspores are produced. In heterosporous plants, a haploid spore produced within a microsporangium of a sporophyte . A flowering plant in which only one embryonic leaf is present.
Monocotyledonous plants comprise a monophyletic lineage derived from within the dicots .
A unicellular gametangium that contains an egg . See also pistil, carpel, style, stigma, ovule, gynoecium. A megasporangium covered by an integument. A single spore within the megasporangium develops into the megagametophyte, which ultimately produces one or more egg cells. Upon fertilization of the egg, the ovule becomes a seed.