zygomorphic

/zahy-guh-mawr-fik, zig-uh-/US // ˌzaɪ gəˈmɔr fɪk, ˌzɪg ə- //UK // (ˌzaɪɡəʊˈmɔːfɪk, ˌzɪɡ-) //

颧骨型,颧骨形态,颧骨形态的,颧形

Definitions

adj.形容词 adjective

1
Biology.
- : having bilateral symmetry; divisible lengthwise into similar or symmetrical halves.

When a flower can be divided by a single plane into two exactly similar parts; then it is said to be zygomorphic.
The flowers are always more or less bilaterally symmetrical (zygomorphic).
In Pelargonium the flower is zygomorphic with a spurred posterior sepal and the petals differing in size or shape.