A, 
BO 
=~ 
132 LEAFLETS. 
S. NoRToNII. Branches glabrate and sparsely lenticellate 
after the first season, earlier puberulent: foliage subcoriaceous, 
thinly soft-pubescent above, densely so beneath ; terminal leaflet 
2 inches long, usually broadly rhombic, tapering cuneately from 
the middle, above this 4 or 6 crenate-lebed on each margin, the 
leaflet occasionally more cuneiform as a whole, being entire to 
far above the middle and with fewer lobes: spikes large, glomer- 
ate towards the ends of the branches, usually 3 or 4 on each of 
several short pedunculiform twigs, bracts tomentulose on the 
back as well as marginally: fruit large, very hirsute. 
Dry hills, Riley Co., Kansas, J. B. Norton, 1895, flowers 25 
April, fruit 12 Oct. Both as in U. S. Herb. 
S. GLABRATA. Branches elongated, straight, puberulent 
the first and second seasons: foliage canescent when very young, 
in maturity glabrate, with some traces of pubescence on the 
veins above, some minute hairs all over the lower face, the veins 
there hirtellous; terminal leaflet 18 to 24 inches long, with 
rather short cuneate base and much longer somewhat deltoid- 
ovate main blade, this deeply 3-lobed, the terminal lobe broadly 
and crenately 3 to 5-lobed ; lateral leaflets 1 inch long, with about 
4 shallow rounded lobes: spikes short, 3 or 4 in each of several 
subsessile glomerules: bracts densely tomentose. 
Black Hills, near Fort Meade, S. Dakota, Dr. Forwood, 1 Sept. 
1887, n. 59 as in U. S. Herb. 
S. TRILOBATA (Nutt.) Common in the whole northerly 
extension of the Rocky Mountains from northern Colorado to 
beyond the British boundary. Twigs puberulent, very delicate- 
ly so, the first season, afterwards glabrous, light ash gray- 
Leaves small, subcoriaceous, glabrous, etc., all as described by 
Nuttall. Bracts of the many short spikes wholly tomentulose. 
Pedicels of the flowers hirtellous. 
Perfect specimens of this are before me in flower, from Pole- 
Creek, Wyoming, by A. Nelson, 2 June, 1894, and in mature 
leaf and young fruit from Cheyenne, 26 June, 1896, collected by 
myself, both sheets in my own herbarium. 
S. BAKERI. Size and habit of the last, or often larger; 
foliage rather larger, thinner, always more or less pubescent on 
