APPW key feature pages

Leaf midvein spines

Check the leaf underside for midveinmidvein:
(n) the primary, usually central vein of a leaf or leaflet
spines.

 

present and prominent

 

present and minute

 

absent

APPW key feature pages

• Aroid or aster?
• Aroids only - spadix and spathe type
• Asteraceae only - floret composition
• Asteraceae only - ray floret petal size and shape
• Duckweed (Lemnaceae) frond roots
• Duckweed (Lemnaceae) frond shape
• Flowering plant family
• Flower color
• Flower pedicel
• Flower symmetry
• Geographic origin
• Inflorescence - number of flowers
• Inflorescence - peduncle
• Inflorescence position
• Flowering plant or non-flowering plant
• Bract(s) subtending inflorescence
• Inflorescence type
• Leaf apex
• Leaf base
• Leaf - degree of dissection
• Leaf dissection - type
• Leaf distribution along stem
• Floating leaf shape in profile
• Leaf heterophylly
• Number of leaflets or lobes
• Leaf length (leaf or leaflet blade)
• Leaf margin
• Leaf midvein spines
• Leaf overall morphology
• Leaf or petiole bands or septae
• Leaf phyllotaxis (arrangement along stem)
• Leaf presence
• Leaf shape - rosette plants
• Leaf shape
• Leaf thickness
• Leaf venation
• Leaf attachment to stem
• Petiole length
• Petiole presence
• Petiole spines
• Petiole morphology
• Liverwort thallus shape
• Size and appearance of petals, tepals, or perianth segments
• Perianth constitution
• Perianth fusion
• Number of petals, tepals, or perianth segments
• Bulb or corm morphology
• Plant appearance (attached plants only)
• Plant attachment
• Plant habit - aquatic
• Plantlet production
• Plant structures for spreading vegetatively
• Plant type
• Plant type - flowering plants
• Root type and presence
• Spongy aerenchyma
• Stem appearance
• Stem presence
• Stem surface ribbing
• Stem shape in cross section
• Stipules present?
• Trapping organs