Iris ser. Longipetalae

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Long-petaled irises
Iris missouriensis
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Monocots
Order: Asparagales
Family: Iridaceae
Genus: Iris
Subgenus: I. subg. Limniris
Series: I. ser. Longipetalae

Iris ser. Longipetalae is a series of the genus Iris, in Iris subg. Limniris.

William Rickatson Dykes in his book 'Handbook of Garden Irises' (of 1924) includes 4 species in his Iris longipetala subsection; including Iris longipetala (Herbert), Iris missouriensis Nuttall, Iris arizonica (Dykes, 1917) and Iris montana (Nuttall).[1] Iris arizonica and Iris Montana have since been classified as synonyms of 'Iris missouriensis'.[2]

The series was then first classified as a 'series' by Diels in 'Die Natürlichen Pflanzenfamilien' (Edited by H. G. A. Engler and K. Prantl) in 1930. It was further expanded by Lawrence in Gentes Herb (written in Dutch) in 1953.[3][4]

There is still a lot of confusion within the series.

The British Iris Society only lists Iris missouriensis and classes Iris longipetala as a variant of Iris missouriensis.[5] The American Iris Society and Pacific Iris Society lists three species; Iris longipetala (Herbert), Iris missouriensis (Nuttall) and Iris pariensis (Welsh).[6][7][8] But Plant List regards 'Iris pariensis' as a synonym of 'Iris missouriensis'.[2] 'Iris pariensis' was found by Stanley Larson Welsh in Utah and published in 'Great Basin Naturalist' 46(2): 256 in 1986.[9]

The series has species are native to western North America,[6] seen in Washington (state), Oregon and California.[10]

They prefer to have moisture in the spring and a dry period during the summer. They also do not like root disturbance hence they are difficult to grow as nursery plants. They are also rarely grown in the UK.[10] The species have thick rhizomes,[8] fruiting stems (that follow the flowers) that stay on the plant until the next growing season, (or longer)[6][8] a stigma with 2 teeth (or lobes)[8] and seed capsules with 6 ribs and taper into points on the ends.[6][8]


  1. ^ Dykes, William (2009). "Handbook of Garden Irises" (PDF). (The Group for Beardless Irises). Retrieved 1 November 2014. 
  2. ^ a b "Iris missouriensis Nutt. is an accepted name". 23 February 2012. Retrieved 3 November 2014. 
  3. ^ James Cullen, Sabina G. Knees, H. Suzanne Cubey (Editors) The European Garden Flora Flowering Plants: A Manual for the Identification, p. 647, at Google Books
  4. ^ "Iris ser. Longipetalae (Diels) G.H.M. Lawrence". Retrieved 1 November 2014. 
  5. ^ Austin, Claire. "Irises A Garden Encyclopedia" (pdf). p. 275. Retrieved 1 November 2014. 
  6. ^ a b c d "Series Longipetalae (Diels) Lawrence". (American Iris Society). 2011-06-16. Retrieved 1 November 2014. 
  7. ^ "Summary of the Genus Iris" (pdf). Retrieved 1 November 2014. 
  8. ^ a b c d e James Cullen, Sabina G. Knees, H. Suzanne Cubey (Editors) The European Garden Flora Flowering Plants: A Manual for the Identification, p. 254, at Google Books
  9. ^ "Iridaceae Iris pariensis S.L.Welsh". (International Plant Names Index). Retrieved 3 November 2014. 
  10. ^ a b Stebbings, Geoff (1997). The Gardener's Guide to Growing Irises. Newton Abbot: David and Charles. p. 17. ISBN 0715305395. 

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