The Chromosome Counts Database (CCDB, version 1.45) is a comprehensive community resource for plant chromosome numbers.
CCDB aims to combine existing data resources into an extensive central database that will be updated regularly by the community.

Users and researchers are encouraged to contribute to the accuracy and completeness of the data in CCDB
by submitting new counts, or reporting erroneous counts .

To start browsing for chromosome numbers, use the Browse page, or the search box above.

Recommended citation:
CCDB is built upon many individual data collection efforts. In addition to the main citation detailed below we recommend citing the major resources where the downloaded data were first assembled.
Main citation: Rice et al. 2015. The Chromosome Counts Database (CCDB) – a community resource of plant chromosome numbers. New Phytol. 206(1): 19-26.


  • 08/16: 483 New counts from IAPT 19 & 20
  • 07/16: 1453 New counts from DCDB- Delphineae Chromosome Database
  • 07/16: 33772 New counts from CromoCat 2015
  • 04/16: 15174 New counts from Cave indices
  • 04/16: 6055 New counts, contributed by Austria checklist
  • 12/15: 421 New counts, contributed by Cannon
  • 11/15: 1698 New counts, contributed by Oberlander
  • 11/15: 193 New counts, contributed by Goldblatt & Manning, for Moraea
  • 11/15: 20 New counts, contributed by Rafael Barbosa Pinto, for Swartzia and Ateleia ovata
  • 08/15 New counts, contributed by IAPT/IOPB
    (data 17 and data 18 )
  • 06/15 New counts, contributed by Gareth D. Holmes, for Clematis aristata
  • 04/15 New counts, contributed by Clemens Pachschwoell, for Doronicum
  • 03/15 Thanks to Sacha Laurent for pointing out a bug related to the parsing of ± signs. The problematic counts were fixed.
  • 01/15 Some chromosome counts of the Fedorov resource were removed due to unreliable taxonomic name resolution. Thanks to Santelmo Vasconcelos for pointing out the problem.
  • 01/15 New counts, contributed by Fahim Altınordu, for Senecio, Tephroseris, Sonchus, Nepeta, and Stachys
  • 01/15 New counts, contributed by Dr. Jayesh Anerao, for Garcinia
  • 01/15 NEW! R package Chromer for accessing CCDB Read more
  • 12/14 CCDB's API now supports species query Read more
  • 12/14 New Darlington counts added