420 CONTRIBUTTONS FROM THE NATIONAL HERBARIUM. 



Leaflets reticulate-veined, glabrous, numerous, with few glands. 



3. H. caudata. 

 Leaflets with obsolete venation, pilose, few, densely black-glandular. 



Pubescence of spreading or reflexed hairs 4. H. melanosticta. 



Pubescence of appressed or incurved hairs 5. H. fruticosa. 



1. Hoffmanseg'gia microphylla Torr. U. S. <& Mex. Bound. Bot. 58. 1859. 

 Sonora and Baja California, common in low sandy places. Southern Cali- 

 fornia ; type from the Colorado Desert. 



Low, usually leafless shrub, 1 to 1.5 meters high, with green branches; 

 flowers 6 to 7 mm. long ; fruit 1.5 cm. long. 



2. HofFmansegg'ia intricata T. S. Brandeg. Proc. Calif. Acad. II. 2: 151. 1889. 

 Hoffmanscgoia glabra Fisher, Contr. U. S. Nat. Herb. 1: 147. 1892. 



Baja California (type locality) and Sonora. 



Shrub, nearly leafless, with rigid spinose branches, forming clumps 45 cm. 

 high ; leaflets 1 to 2 mm. long. 



3. Hoffmanseggia caudata A. Gray, Bost. Journ. Nat. Hist. 6: 179. 1850. 

 Occurring in Texas at various places along the Rio Grande, and doubtless 



also on the Mexican side ; type collected between the Nueces and the Rio 

 Grande. 



Plants low, suflfrutescent ; leaflets small, pale, coriaceous ; racemes few- 

 flowered. 



4. Hoffmanseggia melanosticta (Schauer) A. Gray, PI. Wright. 1: 54. 1852. 

 Pomana melanosticta Schauer, Linnaea 20: 748. 1847. 



Hoffmanseggia melanosticta greggii Fisher, Contr. U. S. Nat. Herb. 1: 149. 



1892. 

 Coahuila to Queretaro. Western Texas (type locality). 



Low shrub, densely pubescent, closely covered with viscid black glands; 

 leaflets oval, about 6 mm. long; flowers yellow, in long racemes. 



5. Hoffmanseggia fruticosa S. Wats. Proc. Amer. Acad. 21: 451. 1886. 

 Known only from the type locality, Jimulco, Coahuila. 



Shrub, about 1.8 meters high. 



10. CAESALPINIA L. Sp. PI. 380. 1753. 



Trees or shrubs, sometimes scandent, usually unarmed but sometimes acule- 

 ate ; leaves bipinnate, the leaflets large or small ; flowers yellow or red, race- 

 mose, large and showy ; fruit very variable, dehiscent or indehiscent. 



Several species of Caesalpinia and roinciana are described by Sess6 and 

 Mociiio,' but the identification of most of them is doubtful. The following ver- 

 nacular names are reported for species of uncertain determination : " Tzuraqua " 

 (Michoac^n, Ramirez); " cahuinga " (Michoacftn) ; " chalate " (Oaxaca). 



Fruit covered with long prickles; rachises of the leaves very spiny. 



Leaves with foliaceous stipules; seeds gray 1. C. crista. 



Leaves without stipules; seeds yellow 2. C. jayabo. 



Fruit not prickly; rachises of the leaves nearly always unarmed. 

 Fruit thick and hard or fleshy, indehiscent or tardily dehiscent, or in a few 

 species thin and dehiscent but some of the calyx lobes then pectinate- 

 dentate. 

 Leaflets linear-oblong, less than 2 mm. wide ; fruit curved or coiled. 



3. C. coriaria. 



' PI. Nov. Hisp. 65-67. 1887. 



