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CCDB → Angiosperms → Caprifoliaceae → Pterocephalus → Pterocephalus virens Webb & Berthel.

4 chromosome counts in Pterocephalus virens Webb & Berthel.:

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		Name	Accepted Name	Gametophytic(n)	Sporophytic(2n)	Data Source	reference
		Pterocephalus virens Webb & Berthel.	Pterocephalus virens Webb & Berthel.		18	IPCN online	Verlaque, R. 1982. In IOPB chromosome number reports LXXVII. Taxon 31: 770–771.
		Pterocephalus virens Webb & Berthel.	Pterocephalus virens Webb & Berthel.		18	IPCN online	Verlaque, R. 1986. étude biosystématique et phylogénétique des Dipsacaceae IV. Tribu des Scabioseae (phylum no. 1, 2, 3). Rev. Cytol. Biol. Vég., Bot. 9: 5–72.
		Pterocephalus virens Webb & Berthel.	Pterocephalus virens Webb & Berthel.		18	IPCN online	Verlaque, R. 1980a. In Chromosome number reports LXVII. Taxon 29: 362–365.
!		Pterocephalus virens Webb & Berthel.	Pterocephalus virens Webb & Berthel.		18	C-values database	Suda J, Kyncl T, Jarolimova V. 2005. Genome size variation in Macaronesian angiosperms: forty percent of the Canarian endemic flora completed. Plant Systematics and Evolution 252: 215-238.