THE FLORA OF THE NOETHEEN TERRITOEY. 273 



Pappus of chaffy scales. — 21. Rutidosis. * 



Pappus of capillary bristles, simple, barbellate or plumose. 



Involucral bracts linear, all herbaceous or the imier ones shortly 



scarious at the tips. — 17. Ixiolaena. 

 Involucral bracts imbricate, scarious or with petal-like laminae. 

 Achenes sessile. 

 Involucral bracts all very thin and scarious. Outer female 



florets usually large and irregular. — ^23. Podolepis. 

 Outer involucral bracts thin and scarious. Achenes more oi 

 less distinctly contracted into a beak. — 19. Leptorrhynchus. 

 Involucral bracts almost all or the inner ones or their laminae 

 opaquely scarious or petal-like. Achenes not beaked. 

 Female florets usually few. Stems erect, leafy, simple or 

 branched. — -18. Hehchrysum. 

 Pappus usually plumose from the base. — ^20. Waitzia. 



Tribe VI. SenecionidcB. — Leaves alternate. Flower-heads either hetero- 

 gamous, with the female florets ligulate or rarely filiform, or sometimes homo- 

 gamous, with all the flowers hermaphrodite and tubular. Receptacle without 

 scales. Anthers obtuse or scarcely pointed at the base, without tails. Style- 

 branches truncate and penicillate, or rarely with pubescent tips or appendages. 

 Pappus of capillary bristles. Involucral bracts in the Australian genera in a 

 single row, with or without a few small outer ones round their base. — 32. 

 Erechthites. 



1. PLEUROCARPiEA, Bbnth. 



1. P. denticulata, Benth. — ^Islands of the Gulf of Carpentaria, R. Brown. 



2. VERNONIA, Scheeb. 

 1. V. cinerea, Less. — ^Victoria River and Macadam Range, F. v. MueUer. 



3. ELEPHANTOPUS, Liito. 

 1. E. scaher, Linn. — Port Essington, Armstrong. 



4. MINURIA, DC. 

 (Therogeron, DC; Elachothamnus, DC; Kippistia, F. v. M.). 

 1. 21. integerrima, Benth. — Hooker's and Sturt's Creeks, F. v. MueUer. 



21. leptophyUa, DC. — Recorded from North AustraUa in National Her- 

 barium Census. 



5. CALOTIS, R. Be., 1820. 

 (Cheiroloma, F. v. M., 1852 ; Goniopogon, Turcz., 1851 ; Huenefeldia, 

 Walp., 1840.) 



Many of the species are noxious weeds. 

 Achenes not A^inged. Perennials. 



Stock emitting stolons or creeping rhizomes and a tuft of radical 

 leaves. Scapes simple or with very few heads. — 4. C scapigera. 

 Stems numerous, erect, several-headed, the radical leaves decayed 

 before flowering. Flower-heads small. Involucral bracts nar- 

 row. — 2. C lappulacea. 

 Achenes winged. Pappus short or of very fine awns. 



Perennial with slender branching stems. — 1. C breviseta. 

 Small annuals. — 3. C pterosperma. 



