White Lammas is listed by John Ray in 1650 and also mentioned by Ellis in 1744 and in Gloucester in 1813 but not thereafter in an English context. However it became the first popular wheat with Australian settlers and from there spread to West Coast of US.

Reference #1

General View of the Agriculture of the County of Gloucester by Thomas Rudge, 1813 LINK
notes: a rare late mention of While Lammas in England, in this case in the Cotswolds

Reference #2

Wheat Varieties Grown in 19th Century Australia by Dirk H.R. Spennemann, 2001 LINK

Other references

Catalogus plantarum circa Cantabrigiam nascentium by John Ray, 1660 LINK

The Modern Husbandman, Oct - Dec by William Ellis, 1744 LINK

Identification images

White Lammas link

Germplasm

AUS 11138 AGG (AUS) #11138

Firwhill VIR (RUS) #k55542

Firwhill USDA-ARS (USA) #PI 107608

Firwhill AGG (AUS) #2414

Lambrigg White Lammas AGG (AUS) #3666

Lambrigg-White Lammas AGG (AUS) #11423

Pacific Bluestem ACW (CHE) #310

Pacific Bluestem VIR (RUS) #k22025

Pacific Bluestem USDA-ARS (USA) #CItr 4067

Pacific Bluestem AGG (AUS) #3137

Wagga White Lammas AGG (AUS) #1600

Wagga White Lammas AGG (AUS) #6119

Wagga White Lammas AGG (AUS) #1601

White Ausrralian VIR (RUS) #k5746

White Australia AGG (AUS) #3538

White Australian USDA-ARS (USA) #PI 45424

White Australian IPK (DEU) #TRI 22920

White Lammas AGG (AUS) #1658

White Lammas AGG (AUS) #12102

White Lammas AGG (AUS) #1659

White Lammas USDA-ARS (USA) #PI 114639