STANDLEY TREES AND SHRUBS OF MEXICO. 593 



Sonora to Coahuila and San Luis Potosl. Texas to Arizona. 



Stems numerous, angled, finely incurved-puberulous, 9 to 30 cm. high ; leaves 

 linear-acieular, 7 to 14 mm. long, 0.6 to 1.3 mm. wide, acute to acuminate, 

 strongly 2-sulcate beneath; racemes 1.5 to 7.8 cm. long; flowers white; wings 

 spatulate-obovate, 2.6 to 3 mm. long, appearing acute by inflexion ; capsule 

 oblong-elliptic, 3 to 3.5 mm. long, 1.6 mm. wide ; seed 2.5 to 3 mm. long ; aril ] 

 to 1.9 mm. long. 



62. Polygala dolichocarpa Blake. Contr. Gray Herb. n. ser. 47: 107. 1916. 



Known only from the type locality, Minas de San Rafael, San Luis Potosl. 



Stems several, suffruticulose below, 10 to 35 cm. high, sulcate. sparsely in- 

 curved-puberulous, soon becoming nearly leafless; leaves linear, 3 to 4.5 mm. 

 long, 0.3 mm. wide, acuminate, thickish, convex and veinless beneath ; racemes 

 loose, 5 to 10 cm. long ; flowers white ; wings spatulate-obovate, 2.7 to 3.2 mm. 

 long; capsule oblong, 2 mm. long, 1 mm. wide, the upper cell very narrowly 

 margined; seed 1.5 mm. long, cylindric; aril 1 mm. long. 



63. Polygala scoparia H. B. K. Nov. Gen. & Sp. 5: 399. 1S21. 

 ? Polygala mexicana Moc. ; DC. Prodr. 1 : 333. 1824. 



Polygala flagellaria Pavon; Chod. Mem. Soe. Phys. Hist Nat. Gen&ve 31^ 282. 

 1893, as synonym. 



Polygala fllifomiis Pavon; Chod. Mem. Soc. Phys. Hist. Nat. Geneve 31^: 282 

 1893, as synonym. 



Mexico and Veracruz ; type collected near the City of Mexico. 



Stems numerous, fruticulose below, slender, striate, finely incurved-puberu- 

 lous, 7.5 to 13 cm. long ; leaves rather crowded, linear-acieular, 5 to 9 mm. long, 

 0.4 to 1 mm. wide, acuminate, cuspidate, thickish, 1-nerved but not sulcate be- 

 neath ; racemes dense or loose below, 0.5 to 2.3 cm. long ; flowers white ; wings 

 obovate, 2.9 mm. long; capsule oval-oblong, 2.7 to 3 mm. long, 1.5 mm. wide, the 

 upper cell narrowly winged ; seed cylindric, 2.2 to 2.5 mm. long ; aril 1.5 mm. 

 long. 



64. Polygala michoacana Robins. & Seat. Proc. Amer. Acad. 28: 103. 1893. 

 San Luis Potosl to Puebla and Michoacd^n ; type from Patzcuaro, Michoaciln. 

 Habit and general characters of P. scoparia ; leaves up to 1.5 mm. wide ; 



racemes 0.7 to 4.2 cm. long ; wings cuneate-obovate, 2.5 mm. long, 1 mm. wide ; 

 capsule suborbicular, 2 to 2.5 mm. long, 1.5 to 1.8 mm. wide ; seed 1.7 to 2 mm. 

 long ; aril 1.2 to 1.8 mm. long. 



65. Polyg-ala viridis S. Wats. Proc. Amer. Acad. 17: 325. 1882. 

 Known only from the type locally, Caracol Mountains, Coahuila. 

 Several-stemmed, suffruticulose, spreading, densely spreading-puberulous, 5.5 



to 11 cm. long; leaves obovate-spatulate, 5 to 11 mm. long, 1.5 to 3.6 ram. wide, 

 coriaceous, spreading-puberulous ; racemes loose. 1 to 2.5 cm. long ; flowers 

 green with narrow white margin; wings obovate, 2.6 mm. long; capsule oval- 

 oblong, narrowly whiged above, 2.8 mm. long, 1.5 mm. wide; seed 2 mm. long; 

 aril 1.2 mm. long. 



2. SECURIDACA L. Sp. PI. 707. 1753. 

 Shrubs or trees, usually scandeut ; leaves alternate, entire, with peziziform 

 stipular glands ; flowers medium or large, in terminal and axillary, often panicled 

 racemes ; outer sepals free or the 2 lower united ; wings large, petaloid ; keel 

 with a fimbriate crest; stamens 8; fruit a 1-celled samara, with a large wing 

 on the lower side. 



7808—23 6 



