CHLORA—CONVOLVULUS, 339 
Chlora perfoliata L. English type. Native. Area8.6. 32. 
Range 0-100. In similar situations to the preceding, but rare. 
About the Magnesian Limestone on the north side of the Wharfe 
at Thorp Arch. In the Central Valley on Carthorpe moor, and 
in a sandy game-preserve between Thirsk and Woodend. 
Amongst the coast banks at Scalby. Seed-field at Thornbrough 
near Thirsk ; W. Foggitt, Bedale ; J. Wheldon. 
Villarsia nymphzoides Vent. Alien. Planted by Tees- 
dale in the lake at Castle Howard, where it still grows, In 
plenty in the brick-ponds on Hob moor; W. Whitwell. A 
native of the south-east of England. 
Menyanthes trifoliata L. British type. Native. Area 
general. Range 0-550. Frequent in ponds and swamps, 
especially amongst the hills, ascending to the plateau of 
Cronkley Fell. 
Polemonium ceruleum L. Alien. A common plant in 
Cottage gardens, and an occasional straggler from garden 
cultivation. | Cotherstone, Lartington, Marrick, Richmond, 
Howgrave, Arncliffe, etc. It is well established in tolerable 
plenty in the hedge which separates Pouter Carr from Baldersby 
Park. Indigenous in West Yorkshire amongst the limestone 
scars of Craven, and in the Westmorland portion of Teesdale. 
Collomia grandiflora Doug. Alien. A native of North 
America, of which about fifty specimens were seen by W. 
Foggitt and myself in 1852 in a field of barley near the Norby 
Sravel-pit, Thirsk. Mentioned by A. De Candolle as a species 
introduced into Germany. 
Convolvulus arvensis L. English type. Native. Area 
© 76 54 3.2 1, Range 0-200. Common in cornfields and 
upon hedgebanks in the low country, ascending Wensleydale 
to Carperby ; J. Percival. 
Convolvulus sepium L. English type. Native. Area 
§eneral. Range 0-300. Common in hedges and by the side of 
Streams in the low country, ascending Wensleydale to Hawes; 
JS. Percival. 
May 1892, 
