THE FLOEA OF THE NOETHERN TEEEITOEY. 223 



Long. 132 (about), lat. 18° 27, G. F. Hill (451), 6/7/1911. 



Eeeorded. Barren ridges, Sea Eange, Victoria Eiver and McAdam 

 Range, F. v. Mueller ; islands of the Gulf of Carpentaria, E. Brown ; Port 

 Essington, Armstrong; Albert Eiver, Henne. 



Milk Bust. "Wood resembles English Elder; useful for engraving and 

 carving. 



6. PAESOISTSIA, E. Bb. 

 {Heligme, Blume.) 



1. P.velutina, R. Br. — ^Victoria River, F. v. Mueller. 

 Cerbera Odollam, Gaertn. ; and Ichnocarpus frutescens, R. Br. ; recorded 

 in ISTational Herbarium Census from Worth Australia. 



ASCLEFIADACEAE. 



Many of this order yield Caoutchouc. The stems (but not the seed- 

 pods) of many yield good fibre. 



Tribe I. Periploceae. Pollen-masses (1, 2 or 4 to each anther) 



granular, evidently consisting of 4 or more agglomerated granules. 



Filaments more or less free (connate in all the other tribes). — '1. 

 Gymnanthera. 



Tribe II. Secamoneae. Pollen-masses smooth, 4 to each anther. — 5 

 Secamone. 



Tribe III. Euasclepiadeae. Pollen-masses smooth, 2 to each anther, 

 pendulous. Corolla-lobes imbricate in the bud, usually contorted. 



Corona of 5 distinct saccate or inflated segments at the back of the 

 anthers, with an exterior corona below them, consisting of 5 protuberances 

 or a slightly prominent ring. Corolla nearly rotate. 



Outer corona very prominent. Plant with succulent leafless 



blanches (in the Australian species). — 3. Saroostemma. 

 Outer corona scarcely prominent. Leaves (in the Australian 

 species) linear. — 4. Pentatropis. 

 Corona membranous, the segments either distinct but not saccate or 

 united in a lobed cup round the gynostegium. Corolla nearly rotate. — 2. 

 Cynanchum. 



Tribe IV. Marsdenieae. Pollen-masses smooth, 2 to each anther, 

 horizontal or erect. Corolla-lobes contorted-imbricate (very slightly so in 

 some Tylophorae). 



Pollen-masses small, globular, laterally attached. CoroUa rotate. Corona 

 of 5 segments more or less fleshy adnate to the gynostegium, and sometimes 

 forming a ring round it. — 8. Tylophora. 



Pollen-masses oblong, erect. CoroUa urceolate or rotate. Corona of 5 

 segments usually fleshy or saccate and adnate at the base, with a short erect 

 free or adnate point. — 9. Marsdenia. 



Pollen-masses erect. Corolla (smaU) with a short, broad tube and spread- 

 ing lobes. Corona none or of 5 scarcely prominent glands at the base of the 

 gynostegium. — 7. Gymnema. 



Tribe V. Stapelieae. Pollen-masses smooth, 2 to each anther, erect 

 Corolla-lobes valvate (often induplicate) . — 6 Mierostemma. 



