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Answer for the clue "A genus of herb having only one known species castor-oil plant ", 7 letters:
ricinus

Word definitions for ricinus in dictionaries

Wikipedia Word definitions in Wikipedia
Ricinus is a genus of chewing lice which parasitise birds. It is the largest genus of chewing lice found parasitizing Passeriformes . The genus Ricinus , including Ricinus communis , the castorbean, also exists in botany - this is possible, since name of ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Ricinus \Ric"i*nus\, n. [L., the castor-oil plant.] (Bot.) A genus of plants of the Spurge family, containing but one species ( Ricinus communis ), the castor-oil plant. The fruit is three-celled, and contains three large seeds from which castor oil is ...

Usage examples of ricinus.

Brassica oleracea, circumnutation of the radicle, of the arched hypocotyl whilst still buried beneath the ground, whilst rising above the ground and straightening itself, and when erect--Circumnutation of the cotyledons--Rate of movement--Analogous observations on various organs in species of Githago, Gossypium, Oxalis, Tropaeolum, Citrus, Aesculus, of several Leguminous and Cucurbitaceous genera, Opuntia, Helianthus, Primula, Cyclamen, Stapelia, Cerinthe, Nolana, Solanum, Beta, Ricinus, Quercus, Corylus, Pinus, Cycas, Canna, Allium, Asparagus, Phalaris, Zea, Avena, Nephrodium, and Selaginella.

Brassica oleracea, circumnutation of the radicle, of the arched hypocotyl whilst still buried beneath the ground, whilst rising above the ground and straightening itself, and when erect--Circumnutation of the cotyledons--Rate of movement--Analogous observations on various organs in species of Githago, Gossypium, Oxalis, Tropaeolum, Citrus, Aesculus, of several Leguminous and Cucurbitaceous genera, Opuntia, Helianthus, Primula, Cyclamen, Stapelia, Cerinthe, Nolana, Solanum, Beta, Ricinus, Quercus, Corylus, Pinus, Cycas, Canna, Allium, Asparagus, Phalaris, Zea, Avena, Nephrodium, and Selaginella.