1901 | Robinson, — North American Euphrasias 271 
wealth of Old World material was obliged to draw his inferences 
regarding the American species from comparatively few and inade- 
quate specimens. During. last August the writer in company with 
Mr. E. F. Williams was able to secure on Mt. Washington specimens 
of the alpine forms there represented and these together with excel- 
lent material from the St. John valley in northern Maine, some very 
interesting forms from Mt. Desert Island secured by E. L. Rand, 
Esq., and the miscellaneous specimens which have long been accumu- 
lating in the Gray Herbarium, have seemed to warrant the present 
attempt to coórdinate our American forms. It must be confessed, 
however, that the present restricted range of several species, the 
nearness of others to Old World forms, and the difficulty of clearly 
delimiting the arctic species, all suggest the probability that consider- 
able further collecting and observation will be necessary before a 
definite settlement of the group can be attained. 
According to Wettstein's treatment the genus Euphrasia contains 
about go species, of which 19 are Australian, 14 South American, 
and the remainder of the northern temperate and arctic zones, occur- 
ring chiefly in mountainous and boreal regions. Wettstein regards 
the following species as exclusively American: Æ. Oakesii and Æ. 
americana, to which may be added the later published Æ. canadensis, 
'Townsend,-—while Æ. /atifolia, and Æ. mollis are treated in the mono- 
graph as common to certain portions of both continents. The possi- 
ble occurrence of Æ. Airtella in America as merely conjectured. All 
these species are annuals and belong to Wettstein's first series, the 
Farvifiorae, which includes also the majority of the rather numerous 
and difficult species of central Europe and the British Isles. : 
SvNoPsIS OF SPECIES. 
* Flowers very small, borne in a compact leafy head or very short dense 
subcapitate raceme: dwarf arctic and alpine species with stems normally 
simple: corolla dorsally 3 to 4 mm. long. 
+ Leaves gray pubescent beneath. 
+ Calyx-teeth straight or nearly so: flowers shortly racemose: Alaskan. 
E. MOLLIs, Wettstein, Monog. d. Gatt. Euphrasia, 141 t. 4, f. 205- 
210, t. 12, f. 5 (1896). Æ. officinalis, var. mollis, Ledeb. Fl. Ross. iii. 
263 (1849). Leaves gray-hirsute upon both surfaces, especially 
upon the nerves beneath, the lower ovate, deeply crenate-toothed, 
