586 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



4.5 mm. wide, thickish, sparsely pubescent beneath ; racemes very short, 1 to 

 S-flowered ; flowers greenish and purplish ; wings oval, 5.5 mm. long ; aril 1.5 

 mm. deep, 2.3 mm. long, the broad scarious margin irregularly lobulate, with 

 indistinct lateral and distinct dorsal lobe descending at an angle of about 45°. 



21. Polygala retifolia Blake, Contr. Gray Herb. n. ser. 47: 29. 1916, 

 Known only from the type locality, Ilio Blanco, Jalisco. 



Stems few, fruticulose below, about 40 cm. high, densely pubescent with 

 short incurved and long straight spreading hairs ; lowest leaves 4 to 11 mm. 

 long, the others linear or linear-lanceolate, 2.5 to 4 cm. long, 1.8 to 4 mm. 

 wide, thick, acuminate, reticulate-venose ; racemes 8 to 14 cm. long ; wings 

 obovate-oval, 5 to 6 mm. long; ovary densely pilose; fruit unknown. 



22. Polygala amphothrix Blake, Contr. Gray Herb. n. ser. 47: 39. 1916. 

 Durango and Tepic ; type from Otinapa, Durango. 



Stems few, 10 to 15 cm. high, densely pubescent with short incurved and 

 long straight wide-spreading hairs; lowest leaves oval, 3.5 to 11.5 mm. long, 

 the others oblong-lanceolate or oval, 15 to 36 mm. long, 4.5 to 16 mm. wide, 

 obtuse or subacute, reticulate ; flowers purplish ; wings oval, 5 to 5.5 mm. 

 long ; ovary densely pilosulous ; fruit unknown. 



23. Polygala obscura Benth. PI. Hartw. 58. 1840. 

 Polygala puberiila A. Gray, PI. AVright. 1: 40. 1852. 



Polygala laeta T. S. Brandeg. Univ. Calif. Publ. Bot. 6: 365. 1917. 



Polygala vagans T. S. Brandeg. Univ. Calif. Publ. Bot. 6: 366. 1917. 



Chihuahua to Oaxaca ; type from Hacienda del Carmen, Oaxaca. Texas to 

 Arizona. 



Many-stemmed, suffruticulose below, 12 to 38 cm. high, grayish-puberulous ; 

 lower leaves oblong or oval-oblong, 12 to 28 mm. long, the middle and upper 

 oblong to lanceolate or linear, 18 to 42 mm. long, 1.5 to 12 mm. wide, puberu- 

 lous ; racemes 3.3 to 9 cm. long ; flowers purplish ; wings oval-obovate or 

 elliptic, 4.5 to 5.8 mm. long, 2 to 3.5 mm. wide ; keel 4.8 to 5 mm. long ; capsule 

 puberulous or merely ciliate; aril 1.3 to 3 mm. high, veil-like, appressed, with 

 very broad, irregularly lobulate, scarious margin. 



23a. Polygala obscura euryptera Blake, Contr. Gray Herb. n. ser. 47: 31. 1916. 

 Oaxaca. 

 Wings 6 to 6.5 mm. long, 4 to 4.5 mm. wide ; keel 6 to 6.5 mm. long. 



24. Polygala lozani Rose, Contr. U. S. Nat. Herb. 13: 307. 1911. 



Polygala calcicola Rose, Contr. U. S. Nat. Herb. 10: 122. pi. 37. 1906. Not 

 P. calcicola Chod. 1893. 



Known only from the type locality. La Canada, near Tehuac^n, Puebla. 



Several-stemmed, suffruticulose below, about 10 cm. high, subcanescent- 

 pubescent ; lower leaves oval, 11 mm. long, the others oblong or linear-oblong, 

 10 to 13 mm. long, 1.8 to 3.5 mm. wide, acutish, incurved-pubescent ; flowers 

 yellowish green ; wings oval, 5 to 5.5 mm. long, subpersistent ; ai'il 1.7 mm. 

 high, the appressed scarious margin irregularly lobulate, deeper than the 

 umbo, the dorsal lobe barely indicated. 



25. Polygala parrasana T. S. Brandeg. Univ. Calif. Publ. Bot. 6: 365. 1917. 

 Known only from the type locality. Sierra de Parras, Coahuila. 



Stems several, fructiculose below, procumbent, 4 to 10 cm. long, densely 

 ascending-pubescent ; leaves oval or elliptic-oblong, 3 to 9 mm. long, 2.5 to 4 mm. 

 wide, apiculate to obtuse, thickish, pubescent both sides ; racemes 1.3 cm. long, 

 few-flowered ; wings oval, 5.2 mm. long ; keel 5.8 mm. long ; aril 1.3 mm. high, 

 1.7 mm. long on the dorsal margin, the umbo 0.4 mm. high, the scarious mar- 



