STANDLEY — TREES AND SHRUBS OF MEXICO. 583 



1. Polygala ovatifolia A. Gray, PI. Wright. 1: 39. 1852. 



Chihuahua to Nuevo I.eon. Texas and New Mexico ; type from western 

 Texas. 



Suffrutescent, erect, 30 cm. high or less, densely spreading-pilose ; leaves 

 ovate, 1.2 to 3 cm. long, 0.6 to 1.3 cm. wide, acutish, spreading-pilose on both 

 sides; racemes 2 to 6.5 cm. long; flowers greenish yellow; wings 4 to 5 mm. 

 long; aril with rather broad, lobed and lobulate, scarious margin. 



2. Polygala buxifolia H. B. K. Nov. Gen. & Sp. 5: 407. 1821. 

 Polygala ovalifolia DC. Prodr. 1: 331. 1824. 



San Luis Potosf and Queretaro; type from Santa Rosa, Queretaro. 



Suffrutescent, ascending, about 28 cm. long, spreading-pubescent ; leaves 

 elliptic or ovate, about 2 cm. long, obtuse or rounded ; wings 5.5 mm. long ; 

 aril with broad .scarious margin and distinct short lateral and spreading dorsal 

 lobes. 



3. Polygala myrtilloides Willd. Sp. PI. 3: 889. 1803. 

 San Luis PotosI and Hidalgo. 



Fruticulose below, denselj' appressed-puberulous ; leaves elliptic to oval-ovate, 

 mostly obtuse, 1.5 to 2 cm. long, subcoriaceous, subappressed-pubescent ; racemes 

 4 to 8-flowered; wings 5.5 to 6.5 mm. long; capsule puberulous and ciliolate; 

 nril broadly scarious-margined, 3-lobed, the dorsal lobe short and horizontal. 



4. Polygala xanti ^ A. Gray, Proc. Amer. Acad. 5: 1.53. 1861. 

 Southern Baja California ; type from Cape San Lucas. 



Suffrutescent below, procumbent or erectish, densely incurved-pubescent ; 

 leaves oval, 6 to 16 mm. long, rounded at apex, densely incurved-pubescent; 

 racemes short ; flowers white, tinged with yellow and purple ; wings 5.3 to 5.8 

 mm. long ; capsule densely pubescent ; scarious margin of aril narrow, equal- 

 ing the umbo, shortly upturned at dorsal apex. 



5. Polygala serpens Blake, Contr. Gray Herb. n. ser. 47: 21. 1916. 

 Known only from the tyiDe locality, Acapulco, Guerrero. 



Suffruticulose, procumbent, incurved-puberulous, 30 cm. long or less ; leaves 

 ovate, 1.5 to 2.8 cm. long, acuminate, thin, incurved-spreading-pubescent ; 

 racemes loose, 2 cm. long ; flowers apparently ochroleucous ; wings 5.5 to 7 mm. 

 long ; aril minute, capitelliform, with obsolete scarious margin. 



6. Polygala pavoni ' Chod. M6m. Soc. Phys. Hist. Nat. Geneve 31 ': 14. 1893. 

 Mexico, without definite locality. 



Undershrub, puberulous, about 20 cm. long; leaves elliptic or elliptic-ovate, 

 varied, 2 cm. long, puberulous, obtuse ; racemes few-flowered ; flowers 5 to 6 

 mm. long ; ovary ciliate ; fruit unknown. 



A species of doubtful i-elationship. 



7. Polygala magdalenae T. S. Brandeg. Univ. Calif. Publ. Bot. 4: 182. 1911. 

 Southern Baja California ; type from Magdalena Island. 



Prostrate, 30 cm. long, incurved-griseous-puberulous ; lowest leaves oval- 

 oblong, 7 mm. long, the others oblong to linear, 1.2 to 2 cm. long, incurved- 



' L. J. Xantus, while exployed by the U. S. Coast Survey, made a collec- 

 tion of about 120 species of plants in Baja California, chiefly about Cape San 

 Lucas. Many new species were published by Gray in his report upon the col- 

 lection (Proc. Amer. Acad. 5: 153-173. 1861). A set of the plants is in the 

 U. S. National Herbarium. 



^ In honor of Jose Pavon, a member of the Spanish scientific commission 

 sent to Peru and Chile in 1777. He was an associate of Ruiz, with whom he 

 published several classic works dealing with South American plants. 



