NEW SPECIES OF ERIOGONUM. 201 
obtuse, the inner narrower, scarcely longer: filaments gla- 
brous: rounded body of the achene surmounted by a stout ` 
trigonous muriculate beak. 
Collected by the author on dry hills of Napa Co., Calif., 
July, 1891; referred to E. gracile in the Flora Franciscana, 
as a yellow-flowered form. The same appears to have been 
collected by Mr. Bioletti at Jackson, Amador Co., in 1893, 
and distributed by him for E. virgatum. 
E. cooNATUM. Near E. tripodum; the lignescent short. 
leafy branches of the caudex closely tufted: leaves oblong- 
obovate, obtuse, 4 to $ inch long, tapering to a petiole of 
l or 2 inches, white-tomentose beneath, glabrous above: 
peduneles several from each branch of the caudex, 6 to 10 
inches high, naked below, but with an involucrate whorl of 
leaves above the middle, and then trifurcate, one of the 
branches shorter, bearing a single involuere, the other two 
once or twice bifurcate or trifurcate, and with a whorl of 
bracts subtending each fork: involueres turbinate, the 5 or 
6 ovate teeth reflexed, the whole together with the pedicels 
subtomentose: perianths yellow, narrowed to a rather short 
stipitiform base, the segments obovate-oblong: filaments 
densely woolly at the very base only. 
Open woods about the base of Mt. San Francisco, and 
about Flagstaff, in northern Arizona; collected by the au- 
thor in July, 1889, and at the time supposed to be E. stel- 
latum, a species which has been misunderstood. Its only 
near relative is the middle Californian Æ. tripodum, some 
forms of which, particularly the one inhabiting Mt. Hamil- 
ton, I had erroneously referred to E. stellatum. 
Tue Hor TREFOILS. 
There is probably no other small group of papilionaceous 
plants the several members of which have so exercised the 
minds of critical and careful botanists in Europe as this one, 
