Cynoglossum is a genus of small-flowered plants in the family Boraginaceae (borage family). It includes 81 species native to Eurasia, Africa, New Guinea, and Australia. Cynoglossum officinale, the common hound's-tongue, is a native of Asia, Africa, and Europe. It has been introduced into North America, and it is considered to be a troublesome weed because its burs stick to the wool of sheep and to other animals. Ingestion of this plant can also lead to photosensitivity in grazing animals.

Species

, there are 81 accepted species in the genus: • Cynoglossum aequinoctiale T.C.E.Fr. • Cynoglossum alpestre Ohwi • Cynoglossum alpinum (Brand) Riedl • Cynoglossum alticola Hilliard & B.L.Burtt • Cynoglossum amabile Stapf & J.R.Drumm. — Chinese hound's tongue • Cynoglossum amplifolium Hochst. ex A.DC. • Cynoglossum asperrimum Nakai • Cynoglossum australe R.Br. • Cynoglossum × austriacum Rech. • Cynoglossum austroafricanum Hilliard & B.L.Burtt • Cynoglossum baeticum Sutorý • Cynoglossum barbaricinum Arrigoni & Selvi • Cynoglossum birkinshawii J.S.Mill. • Cynoglossum borbonicum (Lam.) Bory • Cynoglossum bottae Deflers • Cynoglossum brandii Sutorý • Cynoglossum castaneum Riedl • Cynoglossum celebicum Brand • Cynoglossum cernuum Baker • Cynoglossum cheirifolium L. • Cynoglossum cheranganiense Verdc. • Cynoglossum clandestinum Desf. • Cynoglossum coeruleum Hochst. ex A.DC. • Cynoglossum columnae Ten. • Cynoglossum creticum Mill. — blue hound's tongue • Cynoglossum dalianum Sutorý • Cynoglossum densefoliatum Chiov. • Cynoglossum dioscoridis Vill. • Cynoglossum divaricatum Stephan ex Lehm. • Cynoglossum formosanum Nakai • Cynoglossum gansuense Y.L.Liu • Cynoglossum germanicum Jacq. — green hound's tongue • Cynoglossum glabellum Riedl • Cynoglossum hanangense Verdc. • Cynoglossum hellwigii Brand • Cynoglossum hispidum Thunb. • Cynoglossum holosericeum Steven • Cynoglossum inyangense E.S.Martins • Cynoglossum javanicum (Lehm.) A.DC. • Cynoglossum kandavanense (Bornm. & Gauba) Akhani • Cynoglossum karamojense Verdc. • Cynoglossum krasniqii Wraber • Cynoglossum lanceolatum Forssk. • Cynoglossum × legionense Rothm. • Cynoglossum lowryanum J.S.Mill. • Cynoglossum macrocalycinum Riedl • Cynoglossum macrolimbe Riedl • Cynoglossum magellense Ten. • Cynoglossum maghrebicum Sutorý • Cynoglossum mathezii Greuter & Burdet • Cynoglossum mediterraneum Sutorý • Cynoglossum meeboldii Brand • Cynoglossum microglochin Benth. • Cynoglossum × modorense Rech. • Cynoglossum monophlebium Baker • Cynoglossum montanum L. • Cynoglossum natolicum (Bornm.) Sutorý • Cynoglossum nebrodense Guss. • Cynoglossum nova-guineese Riedl • Cynoglossum obtusicalyx Retief & A.E.van Wyk • Cynoglossum officinale L. — common hound's tongue • Cynoglossum papuanum Schltr. ex O.Brand • Cynoglossum pitardianum Greuter & Burdet • Cynoglossum pustulatum Boiss. • Cynoglossum rochelia A.DC. • Cynoglossum sabirense (R.R.Mill & A.G.Mill.) J.R.I.Wood • Cynoglossum semnanicum Khat. • Cynoglossum seravshanicum (B.Fedtsch.) Popov • Cynoglossum spelaeum Hilliard & B.L.Burtt • Cynoglossum sphacioticum Boiss. & Heldr. • Cynoglossum stewartii Kazmi • Cynoglossum timorense Riedl • Cynoglossum torvum Dimon & M.A.M.Renner • Cynoglossum trinervium (Duthie) Greuter & Stier • Cynoglossum trollii Melch. • Cynoglossum tsaratananense J.S.Mill. • Cynoglossum tubiflorum (Murb.) Greuter & Burdet • Cynoglossum ukaguruense Verdc. • Cynoglossum vanense Sutorý • Cynoglossum viridiflorum Pall. ex Lehm. • Cynoglossum wallichii G.Don • Cynoglossum watieri (Batt. & Maire) Braun-Blanq. & Maire • Cynoglossum wildii E.S.Martins • Cynoglossum yemenense (R.R.Mill & A.G.Mill.) Verdc. • Cynoglossum zeylanicum (Sw. ex Lehm.) Thunb. ex Brand — Ceylon hound's tongue

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