BOSACBOtrS GBJS"EfeA. 24:1 



light-green, not even the indument reddened : odd leaflet broadly 

 ovate, 3 inches long, 1 J inches wide, merely acute, doubly serrate- 

 toothed, all pale beneath with very light and thin tomentum, all 

 veins aculeolate : calyx densely acnleolate but not glandular. 



Middle or northern Colorado, apparently, and in the lower 

 foothills only, Cowen, 17 June, 1895, n. 149, as in U. S. Herb. 



B. UNIOOLOE. Young stem and twigs glaucous, less hispid, 

 mature foliage green alike on both faces : leaflets narrower ; the 

 odd one ovate to rhomboid and oblong-lanceolate, doubly serrate, 

 the laterals small in proportion, all aculeolate on the lower part 

 of the veins beneath : calyx with broad ovate-acuminate seg- 

 ments and both lightly glandular-hairy and aculeolate. 



E"ear Eed Lodge, Montana, 37 July, 1893, J. IST. Eose, n. 52, 

 as in U. S. Herb. 



B. PBEAMOEifA. Mature stems nearly smooth, the bristles 

 short and very sparse; twigs and pedicels showing rather more 

 numerous and longer gland-tipped hairs; leaves ample, thin, 

 green and glabrous on both faces when mature, rather copiously 

 aculeolate on the veins beneath ; odd leaflet ovate to oval, 2 inches 

 long or more, acuminate, lightly incised, the lobes serrate : calyx 

 both finely aculeolate and glandular-hairy almost to the tips of 

 the long triangular-subulate segments. 



In meadows along the banks of St. Mary's River, Idaho, June, 

 1805, J. B. Leiberg, n. 1105, as in U. S. Herb. Of most elegant 

 thin green long-pointed foliage. 



B. CATAPHRACTA. Densely armed, both as to the main stem 

 and twigs, with rigid prickles, some longer and straight, others 

 shorter, widened at base and slightly deflexed, this armature sup- 

 plemented by as many short, rather rigid gland-tipped bristles; 

 leaves small, deep-green on both faces in age, the younger white 

 tomentose beneath, the veins of all beneath closely beset with 

 strong flat prickles, with others short and subterete intervening; 

 odd leaflet ovate, acute, simply or doubly serrate, IJ inches long •_ 

 calyx and pedicels glandular-pubescent beneath a strong arma- 

 ture of prickles. 



