What's the difference between centaurea and knapweed?
Centaurea
Definition:
(n.) A large genus of composite plants, related to the thistles and including the cornflower or bluebottle (Centaurea Cyanus) and the star thistle (C. Calcitrapa).
Example Sentences:
(1) The effect of beta-sitosterol 3-beta-glucoside (antihyperglycemic principle isolated from the aerial part of Centaurea seridis L. var.
(2) Two aquous crude extracts of Centaurea aspera L. flowers were tested for hypoglycaemic activity in normal and alloxan-diabetic rats.
(3) Beta-Sitosterol-3-beta-D-glucoside (1) has been reported to be the active antidiabetic agent of Centaurea seridis L. var.
(4) Four sesquiterpene lactones and three other compounds have been isolated from the EtOH-H2O-soluble fraction of a CHCl3 extract of Centaurea ornata.
(6) A sesquiterpene lactone, onopordopicrin [1], has been isolated from Centaurea sonchifolia.
(7) This paper deals with phytopharmacological evaluation of the therapeutic potential of the plants found in the Neanderthal grave of a Shanidar IV individual (Iraq), where the palynological analysis of some other authors discovered the following flowers: Achillea-type, Centaurea solstitialis, Senecio-type, Muscari-type, Ephedra altissima, Althea-type.
(8) Extracts of the aerial parts of the yellow star thistle (Centaurea solstitialis L.) were prepared using petroleum ether, chloroform and methanol and toxicity assessed in primary cell cultures of striatum, frontal cortex and mesencephalon, containing the substantia nigra or raphe nucleus from the brain of the foetal rat.
Knapweed
Definition:
(n.) The black centaury (Centaurea nigra); -- so called from the knoblike heads of flowers. Called also bullweed.
Example Sentences:
(1) The footpaths I followed became swamped with knapweed, bramble and nettle.
(2) Repin, one of the sesquiterpene lactones found in Russian knapweed, has been shown to possess high toxicity toward chick embryo sensory neurons.
(3) Consumption of Russian knapweed (Acroptilon repens) by horses results in the necrosis of neural cells in the substantia nigra.
(4) It would be a day of spiders’ webs, drifting thistledown shredded by goldfinches , ripening berries and lethargic bumblebees clinging to the last of the knapweed flowers .
(5) As Ian prepares for the half-mile-long return journey, he points a fistful of oily cotton waste towards the purple thistle-like flowerheads of knapweed, the pink, white and blue pincushion-shaped flowers of scabious, and the vivid blue of cornflower.