( 278) 



scarcely exsertecl. Perigonium 6-partecI, 2-se- 

 riate. 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-angalar akene. 

 Peduncles clichotomous. 



1. C. MEMBRANACEA Benth. Stemerect; in- 

 volucre equally 6-cleft, 3-flo\vered, only one 

 flower developed; leaves scattered. — 0. Niles. 

 Spring. 



2. 0. DouGLASii Benth. Stem erect; in- 

 volucre unequally cleft, 1-liowered; leaves ver- 

 ticillate. — 0. Santa Cruz mountains. Spring. 



3. C. PUNGENS Benth. Stem procumbent; 

 involucre unequally dentate, teeth alternately 

 smaller; leaves mostly opposite. — 0. Presi- 

 dio. Spring. 



5 Lastarriaea Kemy. 



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. 



1. L. Chilensis Bemy. — Common. Spring. 



6. Pterostegia Fisch. & Mey. 

 Involucre a single 2-lobed bract, subtending 

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

 sistent. Stamens 6 (rarely fewer). Fruit a 

 3-angular akene, loosely enveloped by the en- 



