190 THE FLORA OF THE NOETHEEN TEEEITOEY. 



1. M. corchorifolia, Linn.- — Port Essington, Armstrong ; Sturt's Creek 

 and Macadam Range, F. v. Mueller. 



2. M. pyramidata, Linn. — ^Abraham's Lagoon, Gilruth and Spencer, 

 July- August, 1911. Recorded. Victoria River, F. v. Mueller. 



3. DICARPIDIUM, P. v. M. 



1. D. monoicum, F. v. M. — Macarthur River, and Seven Emu Creek, 

 P. V. Mueller. 



4. WALTHERIA, Lraif. 1737. 



{Astropus, Spreng., 1822 ; Lophanthus, Forst., 1776.) 



Calyx teeth relatively short. — 1. W. indica. 

 Calyx teeth very long. — 2. W. virgata. 



1. W. indica, Linn. (W. americana. Linn.). — ^Edith Creek, GUruth and 

 Spencer, July- August, 1911. 



Recorded. Cambridge GuK, A. Cunningham ; Victoria River and 

 Amhem's Land, P. v. Mueller ; Port Essington, Armstrong ; Gulf of Car- 

 pentaria, R. Brown, Landsborough. 



A wide-spread weed of tropical countries. 



2. Waltheria virgata, Ewart and Goohson (Plate XIX.). — ^A small bushy 

 shrub, branches glabrous when old, pubescent when young. Leaves shortly 

 petiolate, alternate, fascicled, obovate, 0.5 to 2.8 cms. long, 0.2 to 0.6 cms. 

 broad. Margins serrate, veins pronounced on under surface. Stellate hairs 

 abundant on under surface, few on upper surface. Stipules subulate, hairy, 

 persistent. 



Plowers small, about 1 cm. long, grouped in dense terminal heads, which 

 are surrounded by long linear hairy bracts. 



Calyx tubular, deeply 5 cleft, calyx-tube about 0.2 mm. long, densely 

 covered on the outer surface with long spreading hairs, while stellate hairs 

 occur on both surfaces. Calyx-lobes dark red 06 to 0.7 mms. long hnear, 

 tapering to a fine point, and bearing long simple hairs. 



Corolla shghtly shorter than calyx, petals 5, free, shghtly clawed, hmb 

 dark blue and dehcate, claw, yellowish-brown and firm. 



Stamens 5 opposite the petals, epipetalous, anther-cells parallel dehiscing 

 longitudinally. 



Ovary sessile, hairy, 1-celled, 2 ovulate, only one ovule, however, becoming 

 a fuUy developed seed. Style in some flowers short, curved with a simple 

 stigma — ^in othejrs long, with a flattened stigmatic surface ; in both cases style 

 bears long simple hairs. Seed small 2 mm. long. 



N.T. Survey Camp IV., G. P. HiU (No. 413), 2/7/11. 



Nearest affinity is with Waltheria indica, L., from which it differs in having 

 larger flowers, the calyx being proportionally longer and the tube shorter, and 

 the petals being blue and almost as long as the calyx. 



5. RULINGIA, R. Be. 



( Achilleopsis, Turcz.) 



1. B. loxophylla, F. v. M. — Tableland between Victoria River and 

 Hooker's and Sturt's Creeks, P. v. Mueller. 



