What is "tripleurospermum"

Tripleurospermum is a genus in the chamomile tribe within the sunflower family. Mayweed is a common name for plants in this genus.

Most of the species are from Europe and temperate Asia although a few are from North America and North Africa. The species are placed in Matricaria by some authors.

Plants typically have lobed leaves that are composed of one to three opposite pairs cut almost to the leaf mid rib: they have indehiscent one-celled fruits that have 3-ribs and two resinous glands at the base, Matricaria species are distinguished from these species by lacking fruits with 3-ribs and the two glands.

| url = http://botany.si.edu/ing/INGsearch.cfm?searchword=Tripleurospermum
| title = Tripleurospermum
| accessdate = 2008-06-14
| date = 2006-02-20
| work = Index Nominum Genericorum
| publisher = International Association for Plant Taxonomy

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1. Tripleurospermum ambiguum (Ledeb.) Franch. & Sav. - Heilongjiang, Xinjiang, Kazakhstan, Mongolia, Uzbekistan, Iran, Kyrgyzstan, Altai Krai
2. Tripleurospermum auriculatum (Boiss.) Rech.f. - Middle East including Egypt + Saudi Arabia
3. Tripleurospermum callosum (Boiss. & Heldr.) E.Hossain - Turkey
4. Tripleurospermum caucasicum (Willd.) Hayek - SE Europe + SW Asia from Switzerland to Iran
5. Tripleurospermum conoclinium (Boiss. & Balansa) Hayek - Greece, Turkey
6. Tripleurospermum daghestanicum Rupr. ex Boiss. - Daghestan
7. Tripleurospermum decipiens (Fisch. & C.A Mey.) Bornm. - Turkey, Iran, Caucasus
8. Tripleurospermum disciforme (C.A.Mey.) Sch.Bip. - central + southwestern Asia
9. Tripleurospermum elongatum (DC.) Bornm. - Turkey, Georgia
10. Tripleurospermum fissurale (Sosn.) E.Hossain - Turkey
11. Tripleurospermum grandiflorum (Hook.) Panigrahi - Arctic Russia
12. Tripleurospermum heterolepis (Freyn & Sint.) Bornm. - Turkey
13. Tripleurospermum homogamum G.X.Fu - Xinjiang
14. Tripleurospermum hygrophilum (Bornm.) Bornm. - Turkey
15. Tripleurospermum inodorum (L.) Sch.Bip. - Europe, temperate and arctic Asia; naturalized in North America, New Zealand etc., considered a noxious weed in some places
16. Tripleurospermum kotschyi (Boiss.) E.Hossain
17. Tripleurospermum lamellatum (Bunge) Rech.f.
18. Tripleurospermum limosum (Maxim.) Pobed. - China ( Hebei, Heilongjiang, Jilin, Liaoning, Inner Mongolia), Japan, Kazakhstan, Korea, Mongolia, Uzbekistan, Russia ( Irkutsk, Amur, Khabarovsk, Primorye)
19. Tripleurospermum maritimum (L.) W.D.J.Koch - Arctic coasts of Eurasia + North America
20. Tripleurospermum melanolepis (Boiss. & Buhse) Pobed. - Turkey, Caucasus
21. Tripleurospermum microcephalum (Boiss.) Bornm. - Turkey, Iran, Syria, Lebanon
22. Tripleurospermum monticola (Boiss. & A.Huet) Bornm. - Azerbaijan, Armenia
23. Tripleurospermum parviflorum (Willd.) Pobed. - Greece, Ukraine, Crimea, European Russia, Caucasus, Turkey, Iran, Syria, Jordan, Lebanon, Iraq, Turkmenistan, Kazakhstan, Uzbekistan
24. Tripleurospermum pichleri (Boiss.) Bornm. - Bithynia region of Turkey
25. Tripleurospermum repens (Freyn & Sint.) Bornm. - Turkey
26. Tripleurospermum rosellum (Boiss. & Orph.) Hayek - Greece + Turkey including islands
27. Tripleurospermum sannineum (Thiéb.) Mout. - Lebanon
28. Tripleurospermum sevanense (Manden.) Pobed. - Turkey, Iran, Armenia
29. Tripleurospermum subpolare Pobed. - Scandinavia, Baltic States, northern European Russia
30. Tripleurospermum szovitsii Pobed. - Caucasus
31. Tripleurospermum tempskyanum (Freyn & Sint.) Hayek - Greece
32. Tripleurospermum tenuifolium (Kit.) Freyn - Caucasus; southeastern Europe from Germany to Bulgaria
33. Tripleurospermum tetragonospermum (F.Schmidt) Pobed. - Heilongjiang, Liaoning, Japan, Russian Far East, North Caucasus
34. Tripleurospermum transcaucasicum (Manden.) Pobed. - Turkey, Georgia, Armenia, Azerbaijan

see Heteromera Matricaria Pyrethrum

• Tripleurospermum breviradiatum - Matricaria breviradiata
• Tripleurospermum fuscatum - Heteromera fuscata
• Tripleurospermum philaenorum - Heteromera philaenorum
• Tripleurospermum pulchrum - Pyrethrum pulchrum