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sphenophyllum
sphenophyllum n.
Brit. 
/ˌsfiːnə(ʊ)ˈfɪləm/
, /ˌsfiːnə(ʊ)ˈfɪləm/U.S. /ˌsfinəˈfɪl(ə)m/
/ˌsfinəˈfɪl(ə)m/ΘΚΠ
the world > plants > particular plants > plants and herbs > fossil plants > [noun]
cycadite18..
Bothrodendron1835
lepidodendron1836
calamite1837
sphenophyllum1837
stigmaria1845
polyporite1846
fucoid1848
Muscites1859
lepidodendrid1863
Bennettites1871
lepidodendroid1872
progymnosperm1885
pteridosperm1904
Bennettitales1907
seed fern1907
1837 Penny Cycl. VII. 294/1 Sphenophyllum..has broad wedge-shaped leaves, the veins of which are forked.
1858 W. Baird Cycl. Nat. Sci. 509/2 Sphenophyllum, a genus of fossil plants peculiar to the coal measures and the transition formations.
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as lemmas