Cyperus 1b Lund Bot Garden 130816 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus 1c Lund Bot Garden 130816 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus alternifolius ssp flabelliformis 1 Bergianska 061009 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus alternifolius ssp flabelliformis 2 Bergianska 061009 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus capitatus 1 Kampos, Lesvos, Greece 100512 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus capitatus 10 Punta Palomas, Andalucía Spain 220413 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus capitatus 2 Kampos, Lesvos, Greece 100512 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus capitatus 6 Bolonia, Andalusia Sp 120324 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus capitatus 7 Punta Palomas, Andalucía Spain 220413 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus capitatus 8 Punta Palomas, Andalucía Spain 220413 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus capitatus 9 Punta Palomas, Andalucía Spain 220413 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus cf rotundus Pefkochori, Greece 050529 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus fuscus 1 Vomb Sk 130928 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus fuscus 10 Tystrup Sö, Frederikskilde, Sjaelland DK 101003 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus fuscus 11 NE of Vomb Sk 140906 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus fuscus 12 NE of Vomb Sk 140906 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus fuscus 13 NE of Vomb Sk 140906 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus fuscus 2 Vomb Sk 130928 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus fuscus 3 Vomb Sk 130928 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus fuscus 4 Vomb Sk 130928 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus fuscus 5 Vomb Sk 130928 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus fuscus 6 Vomb Sk 130928 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus fuscus 8 Tystrup Sö, Frederikskilde, Sjaelland DK 101003 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus fuscus 9 Tystrup Sö, Frederikskilde, Sjaelland DK 101003 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus laevigatus 2 Western Flora, Western Australia 110924 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus laevigatus 3 Western Flora, Western Australia 110924 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus laevigatus 4 Western Flora, Western Australia 110924 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus laevigatus 5 Western Flora, Western Australia 110924 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus longus 1 Tueholmssöen, Tåstrup, Sjaelland DK 130811 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus longus 3 Tueholmssöen, Tåstrup, Sjaelland DK 130811 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus longus 4 Tueholmssöen, Tåstrup, Sjaelland DK 130811 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus longus 5 Tueholmssöen, Tåstrup, Sjaelland DK 130811 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus papyrus 1 Bergianska 150527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus papyrus 2 Bergianska 150527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus tenellus 1 Merci Swamp N Manjimup, Western Australia 110927 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus tenellus 2 Merci Swamp N Manjimup, Western Australia 110927 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus trachysanthos 4 Lyon Arboretum, Honolulu, Hawaii 130708 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus trachysanthos 6 Maui Nui Botanical Garden, Kaluhui, Maui, Hawaii 130718 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus trachysanthos 7 Maui Nui Botanical Garden, Kaluhui, Maui, Hawaii 130718 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus 1a Lund Bot Garden 130816 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus capitatus 3 Kampos, Lesvos, Greece 100512 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus capitatus 4 Kampos, Lesvos, Greece 100512 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus capitatus 5 Bolonia, Andalusia SP 120324 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus fuscus 7 Vomb Sk 130928 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus laevigatus 1 Western Flora, Western Australia 110924 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus longus 2 Tueholmssöen, Tåstrup, Sjaelland DK 130811 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus tenellus 3 Merci Swamp N Manjimup, Western Australia 110927 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus trachysanthos 1 Lyon Arboretum, Honolulu, Hawaii 130708 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus trachysanthos 2 Lyon Arboretum, Honolulu, Hawaii 130708 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus trachysanthos 3 Lyon Arboretum, Honolulu, Hawaii 130708 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Cyperus trachysanthos 5 Maui Nui Botanical Garden, Kaluhui, Maui, Hawaii 130718 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).