different between umbelliferous vs orthospermous

English

umbel +? -iferous

umbelliferous (not comparable)

Ancient Greek

orthospermous (not comparable)

(botany) Having the seeds straight, as in the fruits of some umbelliferous plants.
- 1859, Charles Darwin, The Origin of Species
  But in regard to the differences both in the internal and external structure of the seeds, […] in the Umbelliferae these differences are of such apparent importance — the seeds being in some cases, according to Tausch, orthospermous in the exterior flowers and coelospermous in the central flowers […]

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