58 Plural marking generally optional: for nouns with non-human referents

A - feature is pervasive or obligatory10
B - feature is neither pervasive nor extremely rare14
C - feature exists, but is extremely rare9
D - attested absence of feature35
X - feature is not applicable (given the structural make-up of the variety/P/C)6
? - no information on feature is available3

Feature area:
Noun phrase
Typical example:
The tree-Ø donʼt grow very tall up there.
Example source:
Variety World Region Type Value
Id Primary text Variety Variety Type