132 lEA^LBTS. 



S. NoRTONii. Brandies glabrate and sparsely lenticellatfe 

 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 creiiate-lebed ou 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, Eiley Co., Kansas, J. B. Norton, 1895, flowers 25 

 April, fruit 12 Oct. Both as in U. S. Herb. 



S. GLABBATA. Branches elongated, straight, puberulent 

 the first and second seasons: foliage canescent when very young, 

 in maturity glabrate, with some trac'es of pubescence on the 

 veins above, some minute hairs all over the lower face, the veins 

 there hirtellous; terminal leaflet If to 2i 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 Port 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. Bakeki. Size and habit of the last, or often larger ; 

 foliage rather larger, thinner, always more or less pubescent on 



