PLANTS COLLECTED BY DR. GAMBEL. 179 



BULBOSTYLIS. 



§. *PsATHVROTus.t Annual, and dichotomously branched ; involucrum of a 

 nearly single series of loosely imbricated, slightly striated scales ; pappus short and 

 scabrous, shorter than the florets ; style not bulbous ; achenia turbinate, densely 

 villous. 



B. *ANNUA. Very dwarf and dichotomously branched, clothed everywhere with greenish furfuraceous 

 scales, and somewhat viscid ; leaves cuneate-obovate, toothed at the apex ; flowers nearly sessile, 

 crowded into an irregular corymb. 



Flowers ochroleucous, twenty or more florets in the oblong involucrum, scales few, 

 linear-lanceolate, the innermost chaffy. Receptacle, small, naked, branches of the 

 style filiform, obtuse, included. Pappus brownish, not very copious, and short. 

 Plant about four or five inches high. 



Hab. Rocky Mountains, near Santa Fe. 



QUERCUS. 



Q. ^GAMBELii. Leaves obovate, shortly petiolate, narrowed below, sinuately lobed, dilated and somewhat 

 three-lobed at the summit, beneath pubescent, the lobes rather obtuse, the upper ones subdentate ; 

 fruit sessile, small, the cup hemispherical, scales ovate-acute ; the glande ovate and acute, about half 

 immersed in the cup ; the conic summit short. 



With the aspect of our northern oaks, but very distinct ; in the leaf approaching a 

 little to L. ohtusihha, but without any near affinity. 



Hab. On the banks of the Rio del Norte, but not abundant. 



OROBANCHE. 



O. *MULTiFLORA. Pubesceut ; branching from the base ; flowers subimbricated, scales lanceolate-acute ; 

 peduncles very short ; flowers purplish, recurved ; calyx deeply five-cleft, bibracteate at base ; 

 segments long and linear ; anthers tufted with hairs. 



Eight or nine inches high, and very robust, branching from the base. The whole 

 plant clothed with short soft hairs. Scales lanceolate and acuminate. Calyx deeply 

 five-cleft, the segments long and linear ; two long bractes immediately beneath the 

 calyx. Corolla pubescent, pale below, the border purplish blue, upper lip bifid, the 

 lower trifid, segments short and oblong. Anthers whitish, with tufts of white hairs 

 above, shortly awned at the base. Seeds minute and numerous, light brown, covered 

 with impressed punctures. 



Hab. Sandy ground along the borders of tlie Rio del Norte. Flowering in 

 September. 



tin reference to the extreme fragility of tlie branches. 

 46 



