Plants in the genus Silaum have umbels which are characteristic of plants in the Apiaceae family (they are umbelliferous, "umbel-bearing"); the umbels in Silaus species tend to lack bracts [REF].
The fruits of Silaum species have a carpophore,[REF] a supporting slender stalk for each half of a gape or burst open (dehisced) fruit[REF] - these are common throughout the Apiaceae family; the carpophore is thread or filament-shaped (filiform) [REF].