540 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



The type of C. sahibris came from Tamaulipas, ami the name is doubtless 

 to be referred here. Collections from Oaxaca and Puebla also were cited; 

 these are probably referable to C. tortuosa. 



3. Castela tortuosa Liebm. Nat. For. Kjobenhavn Vid. Medd. 1853: 108. 1854. 

 Castelaria tortuosa Small, N. Amer. Fl. 25: 231. 1911. 



Puebla and Oaxaca ; type from Tehuacftn, Puebla. 



Shrub, 1 to 2 meters high, with croolved spiny branches; leaves 0.8 to 1.5 cm. 

 long; flowers reddish purple, 2.5 mm. long. 



4. Castela retusa Liebm. Nat. For. Kjobenhavn Vid. Medd. 1853: 110. 1854. 

 Oaxaca ; type from San Carlos. 



Very spiny shrub ; leaves lustrous on the upper surface. "Amargoso," 

 "palo amargoso" (Reko.). 



The writer has seen no material of this or of C. tortuosa. 



The species of the genus are closely related, and it is doubtful whether all 

 those listed above are distinct. 



DOUBTFUL SPECIES. 



Castela lychnophoroides Liebm. Nat. For. Kjobenhavn Vid. Medd. 1853: 

 111. 1854. Type from Tehuacan, Puebla. Referred doubtfully to the genus 

 by Liebmann. 



3. ALVARADOA* Liebm. Nat. For. Kjobenhavn Vid. Medd. 1853: 100. 1854. 



1. Alvaradoa amorphoides Liebm. Nat. For. Kjobenhavn Vid. Medd. 1853: 



100. 1854. 



Alvaradoa mexicana Liebm. ; Benth. PI. Hartw. 344. 1857. 



Southern Chihuahua to Jalisco and Chiapas ; Yucatan and Campeciie ; type 

 from Bolafios, Jalisco. Central America, West Indies, and southern Florida. 



Tree, 3 to 8 meters high (reported to reach a weight of 18 meters) ; leaves 

 pinnate, the leaflets 19 to 51, oval or oblong, 1 to 2.5 cm. long, finely sericeous 

 beneath ; flowers small, dioecious, green or yellowish white, in long racemes ; 

 fruit a lanceolate samara 1 to 1.5 cm. long, pilose. " Bel-cinich6," " xbesinic-ch6 " 

 (Yucatan, Maya); "palo de hormigas " (Yucatan); " plumajillo " (Guate- 

 mala); "pi6 de gallo " (Sinaloa) ; " tamarindillo " (Cuba). 



4. PICRELLA Baill. Adansonia 10: 150. 1871. 



1. Picrella trifoliata Baill. Adansonia 10: 150. pi. 10. 1871. 



Described from plants cultivated at Paris, believed to be of Mexican origin ; 

 the plant is not known otherwise. 



Slender shrub ; leaves palmately 3-foliolate, the leaflets ovate, oval, or obovate, 



I to 2.5 cm. long, entire ; flowers small, perfect, in small axillary panicles. 



5. SIMAROUBA Aubl. PI. Guian. 2: 859. 1775. 

 1. Simarouba glauca DC. Ann. Mus. Paris 17: 424. 1811. 



Yucatan. Florida, West Indies, and Central America ; probably also in 

 northern South America ; type from Cuba. 

 Tree, sometimes 30 meters high ; leaves persistent, pinnate, the leaflets usually 



II to 21, oblong, 5 to 10 cm. long, glabrate, pale beneath; flowers small, green- 

 ish, in rather large loose panicles; fruit drupaceous, oval, 1.5 to 2 cm. long, 

 red or dark purple; wood soft, brownish. " Xpaxakil " (Yucatan, Maya); 

 " simaruba " (Costa Rica); " aceituno " (Nicaragua, El Salvador, Panama); 



* The genus was named in honor of Pedro de Alvarado, one of the associates 

 of Cortes. 



