THE FLORA OF THE NORTHERN TERRITORY. 221 



Leaves almost sessile under the cluster of pedicels, which appear as if 

 inserted on the petiole. Flowers white. 



Leaves 2 to 8 in. diameter. Calyx 3.to 4 lines long. — 3. L. iudicum. 

 Leaves under 1 in. diameter. Calyx 1 line long. Stems filiform. — 

 4. L. minimum. 

 Leaves all on long petioles. Pedicels usually 2 together at the nodes 

 of almost leafless stems. Flowers yellow. 



Leaves mostly crenate. Corolla-lobes with a longitudinal central 



wing inside. — 1. L. crenatum. 

 Leaves entire. Ck»rolla-lobes without any longitudinal wing. — 2. L. 

 geminatum. 



1. L. crenatam, F.v. M. — ^Five Mile Bar, MacArthur River. G. F. Hill 

 (728), 10/1/1912. 



Recorded. Albert River and Bentinck Island, Henne. 

 Fringed Water Lily (yellow). 



2. L. geminatum, Griseb. — ^Albert River and Bentinck Island, Henne ; 

 stagnant waters near McAdam Range, F. v. MueUer. 



3. L. indicum, Thw. — ^Ponds near S. AUigator River towards McAdam 

 Range, F. v. Mueller. 



Fringed Water Lily (white). 



4. L. minimum, F. v. M. — ^York Sound, N. W. Coast, A. Cunningham ; 

 lagoons on the Fitzmaurice River, F. v. MueUer. 



APOCYNACEAE. 



Many plants of this order yield Caoutchouc. 

 Anthers wholly included in the corolla-tube, and usually free. 

 Ovary single, the carpels completely united from the base. — 1. Carissa. 

 Ovary of 2 distinct carpels united only by the whole or the summit of 



the style. 

 Ovules few (4 to 6 to each carpel . Fruit of 1 or 2 indehiscent 



drupes or berries. Mostly trees or shrubs. — 4. Alyxia. 

 Ovules numerous. Fruit follicular, dehiscent or without any 

 hardened endocarp. 



Follicles short, usually pulpy and scarcely dehiscent. Seeds 

 without hairs. Erect trees or shrubs. Leaves opposite. — 

 3. Tabernaemortana. 

 Follicles long and linear, dehiscent. Seeds bordered by hairs, 

 very long at one or both ends. Erect trees or shrubs. 

 Leaves whorled or opposite. — 2. Alstonia. 

 Anthers exserted and cohering or connivent in a cone or ring round the 

 stigma. Stems twining. Seeds with a coma. 



Throat of the corolla with a corona of scales sometimes united in 

 a ring. Carpelsdistinct or nearly so. Pappus at the end furthest 

 from the hilum. — 5. Wrightia. 

 No corona. Carpels united in a 2-celled ovary. Pappus at the 

 hilum. — 6. Parsonsia. 



1. CAEISSA, Linn, 1T67. 

 (Antura, Forsk., 1775 ; Arduina, Mill., 1759.) 



Leaves ovate, rhomboidal or orbicular, those of the smaller branches 

 broadly elliptical. — 2. C. ovata. 



