Table 1.
Percentage of Angiosperm genera with companion cell and phloem parenchyma transfer cells (TCs) in their minor veins.
| Data source | Sub taxon/family | No of genera/species | Percent genera with TCs | Percent transfer cell type | ||
|---|---|---|---|---|---|---|
| CC | CC-PP | PP | ||||
| Pate and Gunning, 1969 | Eudicot | 3092a | 43.8 | 25.8 | 16.6 | 1.3 |
| Eudicot minus Compositaea | 2192b | 21.0 | 15.8 | 4.2 | 1.1 | |
| Gamalei, 1989 | Monocot | 26c | 15.4 | ND | ND | ND |
| Eudicot | 393c | 22.6 | ND | ND | ND | |
| Batashev et al., 2013 | Asteraceae | 315c | 22.5 | 15.6 | 6.3 | 0.6 |
Data are derived from surveys by Pate and Gunning (1969), Gamalei (1989) and Batashev et al., this issue. CC, companion cell; CC-PP, companion cell–phloem parenchyma; PP, phloem parenchyma.
a
Estimated from the total number of genera in each family using the proportion of the sampled genera with transfer cells.
b
Compositae have been removed from the calculation described in a to provide data comparable to Gamalei (1989) that does not include this family in which all genera have transfer cells.
c
Number of genera/species examined.