Syrmatium haydonii

Syrmatium haydonii, synonyms Lotus haydonii and Acmispon haydonii, is a species of legume native to California.[2][3] It is known by the common names rock bird's-foot trefoil, Haydon's lotus, and pygmy lotus. It is native to the dry mountain slopes and deserts of southern California, mainly the deserts of eastern San Diego County, where it grows in scrub and woodland habitat. It is a small bushy perennial herb spreading with mostly naked, slender stems. The sparse leaves are made up of usually three tiny leaflets and are deciduous. The inflorescence is generally made up of one or two yellow to reddish pealike flowers each under a centimeter long. The fruit is a curved legume pod also under a centimeter long.

Syrmatium haydonii
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fabales
Family: Fabaceae
Genus: Syrmatium
Species:
S. haydonii
Binomial name
Syrmatium haydonii
(Orcutt) Brand[1]
Synonyms[2][3][4]
  • Hosackia haydonii Orcutt
  • Syrmatium haydonii (Orcutt) A.Heller, isonym
  • Lotus haydonii (Orcutt) Greene
  • Lotus spencerae J.F.Macbr.
  • Acmispon haydonii (Orcutt) Brouillet

Taxonomy

The species was first described in 1889 by Charles Russell Orcutt as Hosackia haydonii. It was subsequently transferred to Lotus by Greene in 1890, to Syrmatium by August Brand in 1898 and independently by Amos Arthur Heller in 1913, and to Acmispon by Luc Brouillet in 2008.[4] As of February 2018, the three generic placements are all accepted by at least one taxonomic database.

References
  1. "Plant Name Details for Syrmatium haydonii (Orcutt) Brand", The International Plant Names Index, retrieved 2018-02-07
  2. "Syrmatium haydoni A.Heller", Plants of the World Online, Royal Botanic Gardens, Kew, retrieved 2018-02-05 (the binomial and authority appear to be errors)
  3. Brouillet, Luc (2012), Jepson Flora Project (ed.), "Acmispon haydonii", Jepson eFlora, Regents of the University of California, retrieved 2018-02-06
  4. "Plant Name Details for Hosackia haydonii Orcutt", The International Plant Names Index, retrieved 2018-02-07


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