834 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Erect shrub, 1 meter high or less, the stems strict, coarsely stellate-pubescent; 

 leaves short-petiolate, obovate or obovate-oblong, 2 to 3.5 cm. loug, 5 to 13 mm. 

 wide, acute or obtuse, green, sparsely stellate-pubescent on both surfaces; 

 flowers crowded at the ends of the branches, numerous ; pedicels of tlie petalif- 

 erous flowers equaling or shorter than the sepals, the inner sepals in anthesis 

 5 to 6 mm. long, stellate-pilosulous, the outer sepals linear, half as long, the 

 petals nearly twice as long as the sepals ; cleistogamous flowers sessile or sub- 

 sessile, smaller ; capsules 4 to 4.5 mm. long, brown, glabrous. 



The type collection was distributed as a new species of Helianthemum under 

 a specific name already emi)loyed in that genus. Pringle 13447 from Uruapan 

 belongs to this species. 



6. Halimium coulteri (S. Wats.) Grosser in Engl. Pflanzenreich IV. 193: 46. 



1903. 



Helianthemum coulteri S. Wats. Proc. Amer. Acad. 17: 323. 1882. 



San Luis PotosI, Mexico, Hidalgo, and Puebla ; type from Zimap^n, Hidalgo. 



Stems chiefly or wholly herbaceous, 10 to 20 cm. high, sparsely branched; 

 leaves short-petiolate, elliptic, elliptic-oblong, or obovate, 1.5 to 3.5 cm. long, 

 rounded to acute at apex, minutely pale-tomentulose beneath ; pedicels equalkig 

 or longer than the calyx ; inner sepals of petaliferous flowers 5 to 7 mm. long 

 in anthesis, 7 to 9 mm. long in fruit. " Juanita " (San Luis PotosI). 



This species was reported by Hemsley as Helianthemum arenicola Chapm. 



7. Halimium nutans (T. S. Brandeg.) Standi. 



Helianthemum nutans T. S. Brandeg. Proc. Calif. Acad. II. 2: 129. 1889. 



Known only from the type locality, Llanos de San Julian, Baja California. 



Slender branched shrub, densely leafy ; leaves 2 to 6 mm. long, obtuse, very 

 minutely stellate-pubescent ; pedicels slender, recurved, longer than the calyx ; 

 sepals in fruit 6 to 7 mm long. 



8. Halimium pringlei (S. Wats.) Grosser in Engl. Pflanzenreich IV. 193: 46. 



1903. 



Helianthemum pringlei S. Wats. Proc. Amer. Acad. 23: 268. 1888. 



Chihuahua and Durango ; type from plains at base of the Sierra Madre, 

 Chihuahua. Guatemala. 



Plants erect, 30 to 50 cm. high ; leaves sessile or nearly so, oblong or oblong- 

 oblanceolate, 1 to 2.5 cm. long, obtuse or acute, minutely stellate-tomentose ; 

 sepals of petaliferous flowers 6 to 8 mm. long, the petals about twice as long; 

 capsules of petaliferous flowers 7 mm. long. 



9. Halimium patens (Henisl.) Grosser in Engl. Pflanzenreich IV. 193: 46. 



1903. 



Helianthemum patens Hemsl. Diag. PI. Mex. 20. 1879. 



? Halimium lerlandieri Briq. Ann. Cons. Jard. Geneve 9-10: 99. 1907. 



San Luis PotosI, Hidalgo, and Puebla ; type from the region of San Luis 

 PotosI. 



Plants suffrutescent at base, 10 to 25 cm. high, slender, spreading; leaves 

 sessile, mostly oblong or elliptic, 7 to 15 mm. long, obtuse or acute, stellate- 

 pubescent, green ; inner sepals of petaliferous flowers 4 to 5 mm. long, the 

 petals nearly twice as long. 



108. BIXACEAE, Arnotto Family. 



1. BIX A L. Sp. PI. 512. 1753. 



The following Is the only species. 



1. Bixa orellana L. Sp. PI. 512. 1753. 



Sinaloa to Veracruz, Yucatiln, Tabasco, and Chiapas. West Indies, Central 

 America, and South America. 



