Table 7.
The number of species at different ploidy levels in the 36 genera of Poaceae that contain species endemic or indigenous to New Zealand and the percentage of species at the different ploidy levels. This table includes the chromosome counts made here plus those taken from Dawson (2000) and de Lange and Murray (2002). This list also includes a number of undescribed taxa and chromosome races (see footnotes)
| Ploidy level |
|||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Genus |
No. of species in NZ* |
No. of species counted |
2x |
4x |
6x |
8x |
10x |
12x |
>12x |
||||||
| Achnatherum | 1 | 1 | – | – | 1 | – | – | – | – | ||||||
| Agrostis | 10 | 8 | – | – | 7 | – | – | 1 | – | ||||||
| Amphibromus | 1 | 1 | – | – | 1 | – | – | – | – | ||||||
| Anemanthele | 1 | 1 | – | 1 | – | – | – | – | – | ||||||
| Australopyrum | 1 | 1 | 1 | – | – | – | – | – | – | ||||||
| Austrofestuca | 1 | 1 | – | 1 | – | – | – | – | – | ||||||
| Austrostipa | 1 | 1 | – | 1 | – | – | – | – | – | ||||||
| Bromus | 1 | 1 | – | 1 | – | – | – | – | – | ||||||
| Cenchrus | 1 | 1 | – | – | 1 | – | – | – | – | ||||||
| Chionochloa | 23 | 23 | – | – | 23 | – | – | – | – | ||||||
| Cortaderia | 5 | 5 | – | – | – | – | 5 | – | – | ||||||
| Deschampsia | 5 | 4 | 4 | – | – | – | – | – | – | ||||||
| Deyeuxia | 6 | 6 | – | 2 | – | 3 | 1 | – | – | ||||||
| Dichelachne | 4 | 4 | – | – | – | – | 4 | – | – | ||||||
| Echinopogon | 1 | 1 | – | – | 1 | – | – | – | – | ||||||
| Elymus | 7 | 7 | – | 1 | 5 | 1 | – | – | – | ||||||
| Festuca | 10 | 10 | – | 1 | 4 | 4 | – | – | 1 × 24x | ||||||
| Hierochloe | 7 | 5 | – | 1 | 1 | – | – | 3 | – | ||||||
| Imperata | 1 | 1 | 1 | – | – | – | – | – | – | ||||||
| Isachne | 1 | 1 | – | – | 1 | – | – | – | – | ||||||
| Koeleria | 5 | 5 | – | 5 | – | – | – | – | – | ||||||
| Lachnagrostis | 13 | 11 | – | – | – | 4 | – | 2 | 5 × 14x | ||||||
| Lepturus | 1 | 0 | – | – | – | – | – | – | – | ||||||
| Microlaena | 4 | 4 | – | 4 | – | – | – | – | – | ||||||
| Oplismenus | 1 | 1 | – | – | 1 | – | – | – | – | ||||||
| Paspalum | 1 | 1 | – | – | 1 | – | – | – | – | ||||||
| Poa | 41 | 36 | – | 29 | – | 1 | – | 1 | 4 × 16x;1 × 38x | ||||||
| Puccinellia | 4 | 4 | 1 | 1 | 1 | 1 | – | – | – | ||||||
| Pyrrhanthera | 1 | 1 | – | – | – | – | – | – | 1 × 26x | ||||||
| Rytidosperma | 22 | 19 | 11 | 7 | 1 | – | – | – | – | ||||||
| Simplicia | 2 | 2 | – | 2 | – | – | – | – | – | ||||||
| Spinifex | 1 | 1 | 1 | – | – | – | – | – | – | ||||||
| Stenostachys | 3 | 3 | – | 3 | – | – | – | – | – | ||||||
| Trisetum | 11 | 11 | – | 10 | – | 1 | – | – | – | ||||||
| Zotovia | 3 | 2 | – | 2 | – | – | – | – | – | ||||||
| Zoysia | 2 | 2 | – | 2 | – | – | – | – | – | ||||||
| Totals | 203 | 186 | 19 (10·2 %) | 74 (39·8 %) | 49 (26·3 %) | 15 (8·1 %) | 10 (5·4 %) | 7 (3·8 %) | 12 (6·5 %) | ||||||
The total number of species in this table differs from that of Edgar and Connor (2000) for the following reasons. One species of Paspalum and one of Bromus have been treated as indigenous (see Materials and Methods); Deyeuxia includes one undescribed taxa, D. aff. quadriseta, and two taxa within D. avenoides differing in C-value; Koeleria includes two undescribed taxa, K. aff. novozelandica and K. aff. cheesemanii; Poa includes three undescribed taxa, P. aff. cita (a), P. aff. cita (b) and P. aff. colensoi; Rytidosperma includes the 2x and 4x races of R. thomsonii and the 4x and 6x races of R. buchananii; and Trisetum includes one undescribed taxa, T. aff. lepidum, and the 4x and 8x races of T. tenellum.