VASCULAR PLANTS. 123 



bracts. Perigonium 6-partecl, 2-seriate. Sta- 

 mens 9, in pairs opposite to the external lobes; 

 singly to the internal ones. Styles 3; stigmas 

 capitate. Fruit a 3-angled, rarely a lenticular, 

 akene. 



0. U- £. peduncles 2 — 3-chotomous. 



4. Chorizanthe, R. Br. 



Involucre 1 — 3-flowered, tubular, 3-angular, 

 6-dentate, mucronate or aristate. Flowers £ , 

 scarcely exserted. Perigonium 6-parted, 2-ser_ 

 iate. Stamens typically 9, in pairs opposite to 

 the external lobes; singly to the internal ones, 

 occasionally by abortion 6 or 3. Styles 3; 

 stigmas capitate, Fruit a 3-angular akene. 



0. 21. peduncles dichotomous. 



5. Lastarriaea, Remy. 



Involucre 0. Perigonium coriaceous, tubu- 

 lar, 6-dentate; the dentations uncinately aris- 

 tate. Stamens 3, inserted on the throat. Fruit 

 a 3-angled akene. 



. diffusely branched. 



6. Pterostegia, Fisch. & Mey. 



Involucre a single 2-lobed bract, sub-tending 

 a single $ flower, Perigonium 6-parted, per- 

 sistent. Stamens 6, (rarely fewer). Fruit a 

 3-angular akene, loosely enveloped by the en- 

 larged involucre. 



