116 Polygonaceae 



teeth bearing an awn or awnless. Flowers equal, gland- 

 ular-pubescent on the outside. Stamens 9. 



1. O. trilobata Gray. Much branched from the base, 1 dm. 

 high or less; leaves somewhat villous, oblanceolate, 2-3 cm. 

 long; bracts ternate, oblong-lanceolate, awned, not reflexed ; in- 

 volucres broadly turbinate, 5-parted nearly to the base, strongly 

 nerved, 3-4 mm. long, with awns slightly shorter than the lobes; 

 pedicels spreading, 4-10 mm. long; flowers 3-5 in each involucre, 

 light rose color, 2 mm. long; segments ligulate-oblong, 3-cleft, 

 the lobes lanceolate, acuminate, slightly erose on the sides; 

 ovary triangular. 



Not common within our limits, but found on dry plains in San Bernardino, 

 Riverside and San Diego Counties. 



7. EBIOGONUM Michx. 



Annual or perennial herbs or rarely shrubs, with 

 basal, alternate or verticillate leaves, without stipules, 

 and perfect involucrate flowers. Involucre campanulate, 

 turbinate or oblong, 4-8-toothed or 4-r8-lobed, awnless, 

 usually many-flowered ; the more or less exserted pedi- 

 cels intermixed with scarious narrow setaceous bracts or 

 bractlets. Perianth 6-parted or deeply 6-cleft, petaloid. 

 Stamens 9, inserted on the base of the perianth. Styles 

 3 ; stigmas capitate. Achene triangular, rarely lenticu- 

 lar. 



* Involucres nerveless, pedicellate; perianth-lobes unequal. 



I. E. Thurberi Torr. Annual, very slender, about 15 cm. 

 high, much branched below the middle, with ovate acute bracts 

 at the forks, tomentose below the panicle, leaves subbasal, 

 rounded-ovate, about 1 cm. long, undulate rugose, pubescent 

 above, white tomentose beneath ; pedicels slender, about 2 cm. 

 long, erect or spreading, involucres campanulate, less than 2 mm. 

 high, cleft nearly to the middle; flowers rose-colored or white, 

 outer segments rounded, much broader than the inner lanceolate 

 ones. 



Common on dry plains and foothills from Pasadena eastward; also in the 

 Santa Ana Mountains. 



