
Colour Variation in Acaena anserinifolia
The majority of plants of Acaena anserinifolia observed had red and purple pigments in addition to chlorophyll. At a number of localities there were a few uniformly bright-green plants which lacked the secondary pigments. These plants bred true for this character Some of the plants possessing secondary pigments bred true, but in others a proportion of the offspring had secondary pigments, while in a lesser proportion these pigments were lacking. Figures for the latter phenomenon in the various localities were as follows:—
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| Secondary Pigments Present | Secondary Pigments Absent | |
|---|---|---|
| Lyall Bay-Seatoun | 84 | 26 |
| South Karori Stream | 84 | 29 |
| South Karori Stream | 39 | 9 |
| Wamui Valley | 34 | 17 |
| Kapiti Island | 45 | 26 |
| Southern Tararuas | 49 | 17 |
| Totals | 335 | 124 |

The overall ratio of progeny with secondary pigments to progeny lacking secondary pigments is 2.7: 1. It seems, therefore, that the production of secondary pigments is controlled by a single genetic factor whose recessive allele is inhibiting when homogygous.
These occasinal plants lacking secondary pigments are probably the form described by Cockayne as Acaena anserinifolia var. viridior (Cockayne, 1916).
