1426 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM 



4. Stevia dictyophylla Robinson, Proc. Amer. Acad, 44: 617. 1909. 



Guanajuato and Jalisco; type from Guanajuato. 



Shrubby, crisp-tomentellous; leaves opposite, the blades ovate or oval-elliptic, 

 3.5 to 6 cm. long, 12 to 25 mm. wide, acutish, entire or obsoletely crenate-dentate, 

 above scabriusculous, beneath paler, crisp-puberulous, prominently reticulate- 

 nervose, on petioles 3 to 7 mm. long; panicles dense, 12 to 14 cm. wide; involucre 

 4 mm. long, griseous-tomentellous; flowers white; pappus of minute squamellae. 

 5* Stevia subpubescens Lag. Gen. & Sp. Nov. 28. 1816. 



Sonora to Vallej' of Mexico and Oaxaca. 



Shrub 1 to 1.6 meters high, branched, griseous-puberulous; leaves opposite, 

 the blades lance-oblong or lance-ovate, 4 to 9.5 cm. long, 1.3 to 2.8 cm. wide, 

 acuminate or acute, at base acutely cuneate, serrulate or subentire, above green, 

 glabrescent or puberulous, beneath densely or sparsely griseous-puberulous or 

 sometimes merely hispidulous along the costa, on naked petioles mostly 1 to 3 

 cm. long; heads in rather dense panicles usually 3 to 8 cm. wide; involucre densely 

 or sometimes sparsely griseous-pilosulous or puberulous; flowers white; pappus 

 of short squamellae only. 



6. Stevia berlandieri A. Gray in Torr. U. S. & Mex. Bound. Bot. 73. 1859. 

 Nuevo Le6n and Tamaulipas; type from San Carlos, Tamaulipas. 

 Shrubby, about 0.5 meter high, glandular-dotted but essentially glabrous; 



leaves opposite, the blades oval-ovate, 1.5 to 3 cm. long, 1 to 2 cm. wide, obtuse 

 or acutish, sparsely crenate-serrate, at base rounded or subtruncate, essentially 

 glabrous, on petioles 1 to 2 cm. long; panicles rather dense, 4 cm. wide or less,; 

 involucre 6 mm. high, dotted with sessile glands; corollas apparently pinkish; 

 achene glabrous; pappus coroniform, short. 

 6a. Stevia berlandieri podadenia Robinson, Proc. Amer. Acad. 44: 616. 1909. 



San Luis Potosi. 



Branches, petioles, and leaves crisp-pubescent; involucre stipitate-glandular. 

 6b. Stevia berlandieri anadenotricha Robinson, Proc. Amer. Acad. 44: 617. 

 1909. 



Southwestern Chihuahua. 



Densely crisp-puberulous; leaves 4 to 5 cm. long, 3.5 to 4 cm. wide; involucre 

 3 to 4 mm.. high, crisp-puberulous, not glandular. 



7. Stevia nervosa DC. Prodr. 5: 117. 1836. 



Known only from the type locality, near Villalpando, Guanajuato. 



Shrubbj^, the branches densely short-velutinous; leaves opposite or alternate, 

 the blades elliptic, 12 to 30 mm. long, 10 to 12 mm. wide, subacute, at base atten- 

 uate, subserrate, thinly pubescent both sides, the nerves prominulous beneath; 

 branches subhirtellous; heads crowded; involucre subhirtellous; achene glabrous; 

 pappus of squamellae and 1 to 3 awns. (Descriptioii compiled.) 



No specimens of this species have been examined, and its position here in the 

 genus is inferential. 



8. Stevia madrensis A. Gray, Proc. Amer. Acad. 21: 382. 1886. 



Known only from the type locality, among pines on summit of mountains, 

 Cumbre, above Batopilas, Chihuahua, altitude 2,685 meters. 



Suffrutescent, about 30 cm. high, branched, incurved-hispidulous; leaves oppo- 

 site, the blades narrowly elliptic or lance-elliptic, 3 to 6 cm. long, 5 to 9 mm. 

 wide, obtuse or acute, cuneate into the barely petioled base, serrulate, sparsely 

 pubescent and strongly venose both sides, paler green beneath; panicles dense, 

 1.2 to 2 cm. wide; involucre sjDarsely appressed-pubescent; flowers lilac-puri^le; 

 pappus coroniform. 



