58 Some hitherto unknown Australian Plants. 



their sides. Bristles of the pappus generally more than 20, 

 the longest one line long. 



Calotis tropica. 



(Sect. Acantharia. ) 



Glabrous or slightly hispid ; rhizome perennial, fibrinous ; 

 stems numerous, erect, much-branched, angular ; leaves 

 linear, acute, tapering into the base, the upper ones 

 gradually smaller, all entire ; scales of the involucre 

 linear, acute, scabrous ; ligules white; acheniums small, 

 hispidulous, with a thick ciliolate margin ; awns 8-10, 

 unequal, retro-aculeate, the longest three times shorter 

 than the achenium. 



In North-West Australia, generally in dry beds of rivers. 



An herb, about one foot high. Leaves from \ to \\ inch 

 long, \-\\ line broad. Flowerheads small. Receptacle 

 broad-conical. Inner flowers sterile. 



It is evidently allied to Calotis breviseta, of which the 

 brief diagnosis does not suffice for recognition. If the C. 

 tropica should prove a variety of that species, then still the 

 above record of this plant will be acceptable, as not only its 

 precise habitat was unknown, but also in showing how great 

 changes this species is apt to undergo. All the other species 

 of Calotis are restricted to extratropical latitudes. 



Erigeron ambiguum. 



(Sect. Euerigeron, ) 



Erect, branched, glandulous and hispidulous downy; leaves 

 sessile, lanceolate, quite entire or grossly and remotely 

 toothed; capitules corymbose, on long peduncles, hemis- 

 pherical ; scales of the involucre linear, acuminate, im- 

 perfectly fringed, almost as long as the ligules ; central 

 flowers few, indistinctly toothed; acheniums linear- 

 oblong, moderately compressed, scantily appressed- 

 hairy, half as long as the pappus ; bristles of the latter 

 15-17, free, scabrous. 



On the Gilbert River. 



Probably a perennial herb. Lower leaves about \\ inch 

 long, upper ones gradually shorter. Outer scales of the in- 

 volucre | line, inner ones about 1 line long, scarious at the 

 margin. Female flowers very slender, with a short narrow 



