Tripleurospermum is a genus in the chamomile tribe within the sunflower family.Schultz, Carl Heinrich Ġinus. 1844. Ueber die Tanaceteen: mit besonderer Berücksichtigung der deutschen Arten 31–34Tropicos, Tripleurospermum Sch. Bip. 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.Flora of North America Vol. 19, 20 and 21 Page 548, Tripleurospermum Schultz-Bipontinus, Tanaceteen. 31. 1844. Flora of China Vol. 20-21 Page 769 三肋果属 san lei guo shu Tripleurospermum Schultz Bipontinus, Tanaceteen. 31. 1844. Altervista Flora Italilana, Camomilla senza odore, Tripleurospermum inodorum (L.) Sch. Bip. includes photos and distribution maps
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.
Species There are approximately 40 species recognised in the genus Tripleurospermum:
Tripleurospermum ambiguum - Heilongjiang, Xinjiang, Kazakhstan, Mongolia, Uzbekistan, Iran, Kyrgyzstan, Altai Krai Tripleurospermum anchialense Tripleurospermum auriculatum (Boiss.) Rech.f. - Middle East including Egypt and Saudi Arabia Tripleurospermum baytopianum Tripleurospermum breviradiatum Tripleurospermum callosum (Boiss. & Heldr.) E.Hossain - Turkey Tripleurospermum caucasicum (Willd.) Hayek - south-eastern Europe and south-western Asia from Switzerland to Iran Tripleurospermum conoclinium (Boiss. & Balansa) Hayek - Greece, Turkey Tripleurospermum corymbosum Tripleurospermum decipiens (Fisch. & C.A Mey.) Bornm. - Turkey, Iran, Caucasus Tripleurospermum disciforme (C.A.Mey.) Sch.Bip. - central and south-western Asia Tripleurospermum elongatum (Fisch. & C.A.Mey. ex DC.) Bornm. - Turkey, Georgia Tripleurospermum eskilense - Turkey Tripleurospermum fissurale - Turkey Tripleurospermum froedinii Tripleurospermum griersonii Tripleurospermum heterolepis - Turkey Tripleurospermum homogamum G.X.Fu - Xinjiang Tripleurospermum hookeri Tripleurospermum hygrophilum - Turkey Tripleurospermum inodorum - Europe, temperate and arctic Asia; naturalized in North America, New Zealand etc., considered a noxious weed in some places Tripleurospermum insularum Tripleurospermum kotschyi Tripleurospermum limosum (Maxim.) Pobed. - China (Hebei, Heilongjiang, Jilin, Liaoning, Inner Mongolia), Japan, Kazakhstan, Korea, Mongolia, Uzbekistan, Russia (Irkutsk, Amur, Khabarovsk, Primorye) Tripleurospermum maritimum (L.) W.D.J.Koch - Arctic coasts of Eurasia and North America Tripleurospermum melanolepis (Boiss. & Buhse) Pobed. - Turkey, Caucasus Tripleurospermum microcephalum (Boiss.) Bornm. - Turkey, Iran, Syria, Lebanon Tripleurospermum monticola (Boiss. & A.Huet) Bornm. - Azerbaijan, Armenia Tripleurospermum parviflorum (Willd.) Pobed. - Greece, Ukraine, Crimea, European Russia, Caucasus, Turkey, Iran, Syria, Jordan, Lebanon, Iraq, Turkmenistan, Kazakhstan, Uzbekistan Tripleurospermum pichleri (Boiss.) Bornm. - Bithynia region of Turkey Tripleurospermum repens - Turkey Tripleurospermum rosellum - Greece and Turkey including islands Tripleurospermum rupestre Tripleurospermum sannineum - Lebanon Tripleurospermum sevanense (Manden.) Pobed. - Turkey, Iran, Armenia Tripleurospermum subpolare - Scandinavia, Baltic States, northern European Russia Tripleurospermum tempskyanum - Greece Tripleurospermum tenuifolium - Caucasus; southeastern Europe from Germany to Bulgaria Tripleurospermum tetragonospermum Tripleurospermum transcaucasicum - Turkey, Georgia, Armenia, Azerbaijan Tripleurospermum ziganaense
Formerly included The genus is closely related to Heteromera, Matricaria, and Pyrethrum. Tripleurospermum breviradiatum - Matricaria breviradiata Tripleurospermum fuscatum - Heteromera fuscata Tripleurospermum philaenorum - Heteromera philaenorum Tripleurospermum pulchrum - Pyrethrum pulchrum
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