Blew-bottle is an different way of writing Blue bottle.
some references below
Blue Bottle (Corne-Floure)
The Description.
The great Blew-Bottle hath long leaves smooth, soft, downy, and sharp pointed: among the leaves rise up crooked and pretty thicke branches, chamfered, furrowed, and garnished with such leaves as are next the ground: on the tops wherof stand faire blew flours tending to purple, consisting of divers little flours, set in a scaly huske or knap like those of Knapweed: the seed is rough or bearded at one end, smooth at the other and shining: the root is tough and long lasting (contrary to the rest of the Corne-floures) and groweth yearly into new shoots whereby it greatly encreaseth.
2 The common Corn-floure hath leaves spred upon the ground, of a whitish green colour, somwhat hackt or cut in the edges like those of corne Scabious: among which riseth up a stalke divided into divers small branches, whereon do grow long leaves of an overworne green colour, with few cuts or none at all. The floures grow at the top of the stalks, of a blew colour, consisting of many smal floures set in a scaly or chaffie head like those of the Knapweeds: the seed is smooth, bright shining, and wrapped in a woolly or flocky matter. The root is small and single, and perisheth when it hath perfected his seed.
3 This Bottle is like to the last described in each respect, saving in the colour of the floures, which are purple, wherein consisteth the difference.
4 The fourth Bottle is also like the precedent, not differing in any point but in the floures; for as the last before mentioned are of a purple colour, contrariwise these are milke white, which sets forth the difference.
http://www.bookofherbs.com/b/Blue_Bottle_Co_rarde.htm
BLUE-BOTTLE (CENTAUREA CYANUS)
Family: Compositae
Bluebottle. Bluebow. Hurtsickle. Blue Cap.
(French) Bluet.
---Part Used---Flowers.
---Medicinal Action and Uses--
The flowers are the part used in modern herbal medicine and are considered to have tonic, stimulant and emmenagogue properties, with action similar to that of Blessed Thistle.
The powder or dried leaves is given with good success to those that are bruised by a fall, or have broken a vein inwardly, and void much blood at the mouth. Taken in the water of Plantain, Horsetail or the Greater Comfrey, it is a remedy against the poison of the scorpion and resisteth all venoms and poison. The seed or leaves taken in wine is good against the plague and all infectious diseases and in pestilential fevers. The juice put into wounds doth quickly solder up the lips of them together and heals ulcers and sores in the mouth. The juice dropped into the eyes takes away heat and inflammation.
http://www.russianherbs.net/herbs/BLUE-BOTTLE.htm