Descripteur : Shape of morphological tubes (OW/SW)
Type du descripteur : categorical
Morphological tubes: Artificial groups corresponding to a same aspect in longitudinal section of different morphological structures.
i.e.: V-shaped = straight canal + bract or V-shaped canal 
OW: Outer wall.
SW: Single wall.
Shape of morphological tubes (OW/SW)
 
 
- Inverted-V shaped
- 
Inverted V-shaped: Resembles A in longitudinal section. 
 
- V-shaped
- 
V-shaped: Resembles V in longitudinal section. 
- S-shaped
- 
S-shaped: Resembles S in longitudinal section. 
 
- None
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