Student or educator? Sign up with your school email and get 6 months of Pro free.
CoChat
Sign Up
Cited by 540

The DOI matches its Crossref record.

The Number of Evolutionary Trees

Felsenstein, Joseph·1978·Systematic Zoology
DOI 10.2307/2412810
Open this paper in CoChat — free account

Abstract

Felsenstein, J. (Department of Genetics, University of Washington, Seattle, Washington 98195) 1978. The number of evolutionary trees. Syst. Zool. 27:27–33.—A simple method of counting the number of possible evolutionary trees is presented. The trees are assumed to be rooted, with labelled tips but unlabelled root and unlabelled interior nodes. The method allows multifurcations as well as bifurcations. It makes use of a simple recurrence relation for T(n,m), the number of trees with n labelled tips and m unlabelled interior nodes. A table of the total number of trees is presented up to n = 22. There are 282,137,824 different trees having 10 tip species, and over 8.87 × 1023 different trees having 20 tip species. The method is extended to count trees some of whose interior nodes may be labelled. The principal uses of these numbers will be to double-check algorithms and notation systems, and to frighten taxonomists.

Overview

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.2307/2412810

Cites

Statistics

Verification

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Citations

Cited by

See all 540

Metadata

Authors
Felsenstein, J.
Venue
Systematic Zoology
Publisher
Oxford University Press (OUP)
Published
1978-03
Volume
27
Issue
1
Pages
27
ISSN
0039-7989 (ISSN-L)
DOI
10.2307/2412810
OpenAlex
W2043887813
Cited by
540
References
0
FWCI
2.33
Type
journal article
Language
en
Open access
closed

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review

How to cite

Cite CoChat for the checks on this page, and the paper for its own findings.

This page
CoChat. (2026). Citation check: The Number of Evolutionary Trees. https://app.cochat.ai/papers/10.2307/2412810
The paper
Felsenstein, J. (1978). The Number of Evolutionary Trees. Systematic Zoology. https://doi.org/10.2307/2412810

Data sources

Bibliographic data: Semantic Scholar, OpenAlex, Crossref.

Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.