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scarcely exserted. Perigonium 6-parted, 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-angular akene. 

 Peduncles dichotomous. 



1. C. MEMBRANACEA Benth. Stem erect; in- 

 volucre equally 6-cleft, 3-flowered, only one 

 flower developed; leaves scattered. 0. Niles. 

 Spring. 



2. C. DOUGLASII Benth. Stem erect; in- 

 volucre unequally cleft, 1 -flowered; leaves ver- 

 ticillate. . Santa Oruz mountains. Spring. 



3. C. PUNGENS Benth. Stem procumbent; 

 involucre unequally dentate, teeth alternately 

 smaller; leaves mostly opposite. 0. Presi- 

 dio. Spring. 



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. 0. Diffusely branched. 



1. L. CHILENSIS Eemy. 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- 



