the absence of involucre is pretty constant [illegible] Call in acridisalis t say nothing about the other. Every single species work different. L. Muhall's own spur in Bot. Journ. the pedicels are but 1-1/2" long - stem subpubescent XXXVII Very near C. alpina - but distinguished by the broader membranous only single involucre & the smaller, more compact heads of white flowers - pappus much less coarsy, comparatively thin. A single immature fruit examined, but carefully lost. The dorsal ligule equally the wings. a will marked very [illegible] C. Fosteri is most readily distinguished by the [illegible] involucre & yellow flowers.