Name: "Bacterium flaccumfaciens" Hedges 1922

Category: Species

Proposed as: sp. nov.

Etymology: flac.cum.fa’ci.ens. L. masc. adj. flaccus, flabby; L. pres. part. faciens, making; N.L. neut. part. adj. flaccumfaciens, wilt-making [probably better: flaccifaciens]

Pronunciation (Latin), gender: … flak-kum-FA-ki-ens, neuter

Nomenclatural type: CECT 4211; CIP 107085; ICMP 2584; JCM 9670; LMG 3645; NCPPB 1446

Conduct genome-based taxonomy at

16S rRNA gene: AJ312209 Analyse FASTA

Original publication: Hedges F. A BACTERIAL WILT OF THE BEAN CAUSED BY BACTERIUM FLACCUMFACIENS NOV. SP. Science 1922; 55:433-434.

Nomenclatural status: not validly published, basonym of name in Approved Lists

Taxonomic status: synonym (and no standing)

Correct name: Curtobacterium flaccumfaciens (Hedges 1922) Collins and Jones 1984

• Synonyms:

  • Name	Kind
    "Curtobacterium poinsettiae" (Starr and Pirone 1942) Osdaghi et al. 2024	heterotypic synonym, not validly published
    Corynebacterium betae Keyworth et al. 1956 (Approved Lists 1980)	heterotypic synonym, validly published under the ICNP
    Corynebacterium flaccumfaciens subsp. betae (Keyworth et al. 1956) Carlson and Vidaver 1982	heterotypic synonym, validly published under the ICNP, distinct rank
    Curtobacterium aurantiacum Osdaghi et al. 2025	heterotypic synonym, validly published under the ICNP
    "Curtobacterium flaccumfaciens" (Hedges 1922) Yamada and Komagata 1972	homotypic synonym, not validly published
    Curtobacterium flaccumfaciens (Hedges 1922) Collins and Jones 1984	homotypic synonym, validly published under the ICNP
    Corynebacterium flaccumfaciens subsp. oortii (Saaltink and Maas Geesteranus 1969) Carlson and Vidaver 1982	heterotypic synonym, validly published under the ICNP, distinct rank
    Corynebacterium oortii Saaltink and Maas Geesteranus 1969 (Approved Lists 1980)	heterotypic synonym, validly published under the ICNP
    Corynebacterium flaccumfaciens (Hedges 1922) Dowson 1942 (Approved Lists 1980)	homotypic synonym, validly published under the ICNP
    "Phytomonas poinsettiae" Starr and Pirone 1942	heterotypic synonym, not validly published, basonym of name in Approved Lists
    Corynebacterium flaccumfaciens subsp. poinsettiae (Starr and Pirone 1942) Carlson and Vidaver 1982	heterotypic synonym, validly published under the ICNP, distinct rank
    Corynebacterium poinsettiae (Starr and Pirone 1942) Burkholder 1948 (Approved Lists 1980)	heterotypic synonym, validly published under the ICNP

• Notes:
  • ⏰ According to Collins and Jones (1983), this species is an earlier heterotypic synonym of "Phytomonas poinsettiae" Starr and Pirone 1942. Publication: Collins MD, Jones D. Reclassification of Corynebacterium flaccumfaciens, Corynebacterium betae, Corynebacterium oortii and Corynebacterium poinsettiae in the genus Curtobacterium, as Curtobacterium flaccumfaciens comb. nov. J. Gen. Microbiol. 1983; 129:3545-3548. 🇬🇧
  • ⏰ According to Collins and Jones (1983), this species is an earlier heterotypic synonym of Corynebacterium betae Keyworth et al. 1956 (Approved Lists 1980). Publication: Collins MD, Jones D. Reclassification of Corynebacterium flaccumfaciens, Corynebacterium betae, Corynebacterium oortii and Corynebacterium poinsettiae in the genus Curtobacterium, as Curtobacterium flaccumfaciens comb. nov. J. Gen. Microbiol. 1983; 129:3545-3548. 🇬🇧
  • ⏰ According to Collins and Jones (1983), this species is an earlier heterotypic synonym of Corynebacterium oortii Saaltink and Maas Geesteranus 1969 (Approved Lists 1980). Publication: Collins MD, Jones D. Reclassification of Corynebacterium flaccumfaciens, Corynebacterium betae, Corynebacterium oortii and Corynebacterium poinsettiae in the genus Curtobacterium, as Curtobacterium flaccumfaciens comb. nov. J. Gen. Microbiol. 1983; 129:3545-3548. 🇬🇧
  • ⏰ According to Collins and Jones (1983), this species is an earlier heterotypic synonym of Corynebacterium poinsettiae (Starr and Pirone 1942) Burkholder 1948 (Approved Lists 1980). Publication: Collins MD, Jones D. Reclassification of Corynebacterium flaccumfaciens, Corynebacterium betae, Corynebacterium oortii and Corynebacterium poinsettiae in the genus Curtobacterium, as Curtobacterium flaccumfaciens comb. nov. J. Gen. Microbiol. 1983; 129:3545-3548. 🇬🇧
  • ⏰ According to Collins and Jones (1983), this species is an earlier heterotypic synonym of "Curtobacterium poinsettiae" (Starr and Pirone 1942) Osdaghi et al. 2024. Publication: Collins MD, Jones D. Reclassification of Corynebacterium flaccumfaciens, Corynebacterium betae, Corynebacterium oortii and Corynebacterium poinsettiae in the genus Curtobacterium, as Curtobacterium flaccumfaciens comb. nov. J. Gen. Microbiol. 1983; 129:3545-3548. 🇬🇧
  • ⏰ According to Committee (2025), this species is an earlier heterotypic synonym of Curtobacterium aurantiacum Osdaghi et al. 2025. Publication: Committee AH. Mitigating changes in prokaryotic nomenclature: Definitions and Workflow. Zenodo 2025; 2025:15320329.
  • 😩 Deposit incorrectly indicated in some sources as representing the type strain of this taxon: ATCC BAA-144.

Parent taxon: "Bacterium" Ehrenberg 1831

Assigned by: Hedges F. A BACTERIAL WILT OF THE BEAN CAUSED BY BACTERIUM FLACCUMFACIENS NOV. SP. Science 1922; 55:433-434.

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Record number: 3910

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