Citrus subg. Papeda
15, see text.
Papeda is the most primitive group of citruses. Because of generally slow growth and bitter, less palatable fruits than in other citruses, its species had only limited commercial cultivation. Some species, like Ichang papeda, are used in landscaping, while others are important for rootstocking and as genome source for breeding disease-resistant and frost-hardy citrus hybrids.
It is believed, based on molecular studies, that the citron, pomelo, mandarin and papeda were the ancestors of all other citrus species and their varieties, which resulted from breeding or natural hybridization among the parental species.
The subgenus includes cultivated plants such as (believed hybrid parentage in parentheses):
- Ichang papeda
- Ichang lemon (pomelo × Ichang papeda)
- Yuzu (papeda × mandarin)
- Kaffir lime or Mauritius papeda
- Kabosu (ichang papeda × bitter orange)
- Sudachi (ichang papeda × mandarin orange)
and a number of wild and uncultivated species and hybrids, including:
- Citrus celebica (Celebes papeda)
- Citrus halimii (Mountain citron)
- Citrus latipes (Khasi papeda)
- Citrus longispina (Winged lime)
- Citrus macrophylla (Alemow)
- Citrus macroptera (Melanesian papeda)
- Citrus micrantha (Biasong)
- Citrus micrantha var. microcarpa (Samuyao)
- Citrus webberi (Kalpi)