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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.—©. Niles. 
Spring. 
2. ©. Dovenasir Benth. Stem erect; in- 
volucre unequally cleft, 1-flowered; leaves ver- 
ticillate.—©. Santa Cruz mountains. Spring. 
3. C. puNGENS Benth. Stem procumbent; 
involucre unequally dentate, teeth alternately 
smaller; leaves mostly opposite.—@. Presi- 
dio. Spring. 
5 Lastarriea Remy. 
Involucre 0. Perigonium coriaceous, tubu- 
lar, 6-dentate, the dentations uncinately aris- 
tate; stamens 3, inserted on the throat. Fruit 
a 8-angled akene.—©. Ditfusely branched. 
1. L. Curtensis Remy.—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- 
