THE FLORA OF THE NOETHEBN TEKH.ITORY. 215 



2. MYRIOPHTLLUM, Ponted, 1735. 



(Enydria, Veil., 1825 ; Hylas, Bigel, 1828 ; Pelonastes, Hook, 1847 ; Pen- 

 tapteris, Hall, 1742; Poutamogeton, Walt., 1788; Purshia, Rafin.). 

 Water Milfoils. 



Leaves all in whorls of 3 to 8, the submerged ones pinnatiseet with 

 capillary segments, the emerged floral ones entire, toothed or shortly lobed. — 

 4. M. verrucosum. 



Leaves all alternate. 



Submerged leaves pinnatiseet with capillary segments. Stamens 8. 

 Carpels 2, smooth. — 1. M. dicoccum. 

 Carpels 4, tuberculate. — 3. M. trachycarpum. 

 Leaves all linear and entire. Minute filiform plants. — 2. M. fili- 

 forme. 



1. M. dicoccum, F. v. M. — ^Robinson River, F. v. Mueller. 



2. M. filiforme, Benth. — Gulf of Carpentaria, mainland oppoate Groote 

 Island, R. Brown. 



3. M. trachycarpum, F. v. M. — Gulf of Carpentaria, opposite Groote 

 Island, R. Brown ; ponds near McAdam Range, F. v. Mueller. 



4. M. verrucosum, Lindl. — Hermansburg, Fiake River, G. P. Hall (68), 

 11/3/1911. 



Victoria River, Bynoe ; Albert River, GuU of Carpentaria, F. v. Mueller. 



UMBELLIFERAE. 



Creeping perennials or slender annuals with scarious stipules. — 1. 

 Hydro cotyle. 



Annuals or perennials, with dissected or toothed leaves without 

 stipules. Fruit very flat. — 2. Trachymene. 



1. HYDROCOTYLE, Linn. Pennywort. 

 1. H. grammMocarpa, F. v. M. — Gulf of Carpentaria, F. v. Mueller. 



2. TRACHYMEISTE, Rudge. 



(Didiscus, DC; Dimetopia, DC; Pritzelia, Walp. ; Huegelia, Reichb. ; 

 Cesatia, Endl. ; Hemicarpus, F. v. M.) 



Coarse erect annuals or biennials. Leaves divided or lobed. Flowers 

 numerous in the umbel. 



One carpel winged, the other usually abortive. — 3, T. villosa. 

 Fruit not winged. — 2. T. glandulosa. 

 Rootstock perennial, with elongated branching stems.- — 1. T. hemiearpa. 



1 . T. hemiearpa, Benth. — Barren plains from Point Pearce to the mouth 

 of the Victoria River. 



Var. major, Benth. — ^Lacrosse Island, Cambridge Gulf and Vansittart 

 Bay, A. Cunningham ; elevated land, Cape Lambert, Nichol Bay, Gregory's 

 Expedition ; Glenelg district, Martin. 



Var. rotundifoUa, Benth. — ^Port Essington, Armstrong. 



2. T. glandulosa, Benth. — ^Nicholson River, Gulf of Carpentaria, F. v. 

 Mueller. 



