62 LEAFI^BTS. 



are 3 only, each being exactly triangular, notched only across 

 the line of the truncate summit. The stipules also of the two 

 are constantly very different. But it will be profitable to 

 make exact diagnoses of these two plants ; and first of all, 

 there needs to be given a fuller statement of the characters of 

 the typical Organ Mountain plant, to which alone, as the 

 specimens before me seem to show, the name chosen applies. 



R. stellata, Wooton (restricted). Stems when growing 

 scarcely armed with other than white broad-based white 

 prickles, but hoarily stellate- tomentose by trichomes radiating 

 around a low murication or obsolete prickle : leaflets of the 

 very short leaves mostly 3, sometimes 4 or 5, all alike tri- 

 angular, entire on two sides, deeply toothed across the trun- 

 cate summit, pubescent on both faces, also closely and 

 minutely somewhat pustulate-roughened above ; stipules 

 proper very short, surpassed by their large foliaceous auricles. 



The contrast between this and the shrub of the White 

 Mountains (or Sierra Blanca, as the name of that range ought 

 always to be written) may be shown by a diagnosis of its stem 

 and leaves quite as brief as the above. I shall call it 



Rosa mirifica. Growing stems light-green without stel- 

 late or any other hairiness, the few stout white prickles sup- 

 plemented by very many intervening short almost filiform 

 recurved and gland-tipped prickles : leaflets more commonly 

 5, of at least twice the size of those of R. stellata, strongly 

 cuneate-obovate, strongly crenate-serrate around the obtuse 

 apex, glabrous on both faces, not in the least pustulate or 

 roughened ; stipules long, wholly herbaceous, their small 

 divergent or subfalcate auricles not notably foliaceous, the 

 whole stipule marginally beset with small sessile glands. 



This account of the leaves of the Sierra Blanca rose does not 

 quite harmonize with the figure above referred to ; for the 

 figure shows leaflets more obovate and less cuneate, and with 

 sharp rather than obtuse teeth, an indentation that could not 

 be called crenate-serrate. But such as I have described here 

 are the leaflets on two good sheets, one in the National 



