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Duckweed (Lemnaceae) frond roots

Lemnaceae are free floating, reduced plants that are the smallest of seed plants. The plant body can be called a thallusthallus:
(n) a photosynthetic plant body that is not (or apparently not) differentiated into stems, roots, and leaves
or frondfrond:
(n) (1) a term used to describe the leaves of, e.g., ferns, palms, or duckweeds; (2) a leaf-like organ (as in .e.g. some algae, such as Caulerpa)
; stem and leaf cannot be differentiated. Only a few genera in the family have roots or a root-like organ (lacking vascular tissue).

single root per frond  
single root per frond
multiple roots per frond  
multiple roots per frond
roots absent  
roots absent
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