SEGREGATES OF KHUS. IS*? 



S. PUNCTicuLATA. Low, stout, rigid, the short branches 

 leafy and puberulent, glabrate after the second season, leaves 

 small, very short-petioled, subcoriaceous, deep green and 

 glabrous above, paler beneath and appressed pubescent on 

 the veins, both faces muriculate-punctate ; terminal leaflet 

 i inch long, broadly obovate above an acute rather than 

 cuneate base, doubly and obtusely crenate : fruit very large, 

 scattered, one only from each spike, wholly glabrous, or with a 

 few small bristly hairs. 



Union Pass, northern Arizona, 31 May, 1903, N. C. Wilson, 

 as in my herbarium. That this species should be in mature leaf 

 and fruit in May, and S. elegantula barely in half grown leaf 

 and full flower in the same month of the same year, and the 

 two occupying stations perhaps 60 or may be 40 miles apart, 

 should intimate to the untravelled the wonderful differences of 

 climatic and other environment plants find there within a 

 small extent of territory. 



S. TEiKBRVATA. Branches stout, rigid, straight, puberulent 

 lenticellate-tuberculate : foliage coriaceous, dark green above, 

 lighter beneath, both faces obscurely puberulent, the margins 

 and veins beneath sparsely pubescent : terminal leaflet 1 inch 

 long, cuneate and entire from about the middle, broadly and 

 shortly 3-lobed, the lobes very obtuse, the terminal now and then 

 3-crenate, the 3 veins leading to the 3 lobes chiefly conspicuous ; 

 lateral leaflets smaller, equal-sided, broadly 5-crenate : scales of 

 the small spikes wholly villous-tomentose. 



San Francisco Mountain, Ariz., 2 Sept., 1889, F. H.Knowlton. 



S. HiRTELLA. Branches slender, hirtellous-tomentose when 

 young, not quite glabrate the second season: leaves small and 

 leaflets elongated, soft-pubescent on both faces ; terminal leaflet 

 quite cuneiform below a short 3-lobed apex, the middle lobe 

 longer than the others and often 3-lobed, all obtuse; laterals 

 small and variable, some cuneate-obovate and 3-lobed, others 

 oval and quite entire : fruits small, glabrous or with a few small 

 bristly hairs. 



Grand Canon of the Colorado, Ariz., 10 July, 1893, E, 0. 

 Wooton. 



