STANDLEY TKEES AND SHRUBS OF MEXICO. 481 



1. Coursetia polyphylla T. S. Brandeg. Univ. Calif. Publ. Bot. 4:376. 1913. 



Known only from the type locality, Bancs del Carrizal, Veracruz. 



Slender shrub, apparently unarmed ; leaflets about 11, oval-oblong or oval- 

 obovate ; fruit 6 cm. long, 5 mm. wide, constricted between the seeds, 



2. Coursetia axillaris Coult. & Rose, Bot. Gaz. 16: 180. 1891. 

 Tamaulipas. Southwestern Texas, the type from San Diego. 



Densely branched shrub or small tree, unarmed ; flowers white, 1 cm. long, 

 solitary or in few-flowered racemes ; fruit linear, 2 to 3.5 cm. long, slightly con- 

 stricted between the seeds. 



3. Coursetia planipetiolata Micheli, aiem. Soc. Phys. Hist. Nat. Geneve 34: 253. 



pi. 5. 1903. 

 Guerrero and Oaxaca ; type from Rio San Luis. 



Shrub, about 2 meters high ; leaflets oval or ovate, 3 to 5.5 cm. long ; flowers 

 pinkish white; fruit 5 to 7 cm. long, 6 mm. wide, brown. 



4. Coursetia mollis Robins. & Greenm. Proc. Amer. Acad. 29: 384. 1894. 

 Sinaloa to Guerrero ; type from the Barranca of Beltrdn, Jalisco. 



Densely pubescent shrub, 1 to 4 meters high, armed with very stout short 

 spines; leaflets often as many as 31, oblong or ovjtl, 1 to 2 cm. long; flowers in 

 short long-pe<lunculate racemes, the standard puri)lish, the other petals pale 

 yellow ; fruit 7 cm. long and 7 mm. wide, scarcely at all constricted. " Gar- 

 bancillo de la costa," " cucablanca " (Sinaloa). 



5. Coursetia glandulosa A. Gray, Proc. Amer. Acad. 5: 156. 1862. 

 Coursetia mivrophyUa A. Gray, Proc. Amer. Acad. 17: 201. 1882. 



Baja California and Sonora to Guerrero ; type from the vicinity of Cape San 

 Lucas, Baja California. 



Shrub or small tree, 1.5 to 6 meters high, unarmed ; leaflets mostly oval, 1 cm. 

 long or shorter ; flowers pink, with yellow center, or white and yellow ; fruit 

 constricted between the seeds. " Samo prieto " (Sonora). 



6. Coursetia madrensis Micheli, M6m. Soc. Phys. Hist. Nat. Geneve 34: 253. pi. 



6. 1903. 



Known only from the type locality, in the Sierra Madre of Michoacan or 

 Guerrero. 



Spiny shrub ; leaflets oval, 1.5 cm. long, sericeous beneath ; flowers blood-red 

 with orange-yellow center. 



DOUBTFUL SPECIES. 



Coursetia virgata (Cav.) DC. Prodr. 2:264. 1825. Aeschynomene virgata 

 Cav. Icon. PI. 3: 47. pi. 293. 1794. Type from New Spain. Scarcely of this 

 genus. 



25. OLNEYA A. Gray, Mem. Amer. Acad. n. ser. 5: 328. 1855. 

 1. Olneya tesota A. Gray, Mem. Amer. Acad. n. ser. 5: 328. 1855. 



Dry plains and hillsides, Sonora and Baja California. Southern Arizona (type 

 locality) and California. 



Shrub or small tree, often only a meter high but sometimes attaining a 

 height of 9 meters, with a trunk diameter of 45 cm. ; branches armed with stiff 

 •sharp spines ; bark thin, scaly, peeling off in long reddish brown strips ; leaves 

 odd-pinnate, the leaflets 11 to 15, 8 to 20 mm. long, grayish ; flowers purplish 

 white, showy, in short racemes ; fruit glandular-haii'y, with 1 to 5 or more 

 seeds. " Palo fierro," " palo de hierro," " firbol de hierro," " tesota," " uiia de 

 gato." 



The English name is " ironwood." Wood hard, strong but brittle, dark brown, 

 the specific gravity about 1.15 ; difficult to work, but sometimes used, and valued 

 for firewood. The Indians of Arizona and northwestern Sonora grind the 



