STANDLEY TREES AND SHRUBS OF MEXICO 1429 



20. Stevia haenkeana DC. Prodr. 5: 122. 1836. 

 Mexico, without definite locality. 



Suffruticulose at base, oppositely branched, thinly velutinous at apex; leaves 

 opposite, on petioles 6 mm. long, the blades elliptic, 24 to 28 mm. long, 12 mm. 

 wide, attenuate at each end, dentate; phyllaries acuminate; achenes scabrius- 

 culous; pappus of 10 to 12 awns as long as the achene. (Description compiled.) 



21. Stevia vernicosa Greenm. Proc. Amer. Acad. 40: 33. 1904. 

 Morelos and Mexico; type from Sierra de Tepoztldn, Morelos. 



Shrub about 1 meter high, oppositely branched, very viscid, glabrous and 

 verrucose, sometimes somewhat pubescent above; leaves opposite, the blades 

 lance-elliptic to oblanceolate, 1.5 to 4.5 cm. long, 4 to 8 mm. wide, acute or 

 obtuse, narrowed into a petioliform base, serrulate, glabrous, glutinous; panicles 

 dense, small, leaf y-bracted ; involucre 6 to 8 mm. high, the phyllaries ciliolate, 

 acuminate; flowers white; achene hispidulous; pappus of minute squamellae and 

 2 to 5 awns about 8 mm. long. 



22. Stevia flourensioides Blake, Contr. U. S. Nat. Herb. 22: 589. 1924. 

 Known only from the type locality, Mount Ixtaccihuatl, State of Mexico, 



altitude 3,355 to 3,660 meters. 



Shrub 0.3 meter high and more, very viscid, loosely puberulous above with 

 many-celled hairs, oppositely branched; leaves opposite, elliptic to oblong- 

 elliptic, 3.5 to 6 cm. long, 5 to 16 mm. wide, obtuse or acutish, cuneately nar- 

 rowed to a subpetiolate base, thick, entire, with obscure veins; panicles 4.5 to 

 6.5 cm. wide, dense, leaf y-bracted ; involucre 7 to 8 mm. high, the phyllaries 

 obtuse to acute; flowers white; achene hispidulous; pappus coroniform, 0.2 mm. 

 long. 



23. Stevia Integra Blake, Contr. U. S. Nat. Herb. 22: 589. 1924. 

 Known only from the type locality, Sierra de la Paila, Coahuila. 

 Frutescent, about 25 cm. high, sparsely branched, puberulous, especially above, 



with ascending or appressed hairs; leaves opposite, scattered above, elliptic to 

 elliptic-obovate, 2.5 to 3.3 cm. long, 4 to 9 mm. wide, acute or obtusish, narrowed 

 into a petioliform base, thick, entire, sparsely pubescent on the costa beneath or 

 glabrous, obscurely veined; panicles dense, 1 to 2.8 cm. wide; flowers white; 

 involucre 6 mm. high, the phyllaries obtuse, sparsely puberulous; achenes hispid- 

 ulous; i^appus of squamellae 0.6 mm. long, rarely with a single awn added. 



24. Stevia scabrella Benth. PL Hartw. 19. 1839. 

 Known only from the type locality, Bolanos, Jalisco. 



Suffrutescent, glabrous; leaves subternate, very short-petioled, the blades 

 oblong-elliptic, 7.5 cm. long, 3.8 cm. wide, acute at each end, sparsely serrate, 

 above glabrous and scabrellous; panicle very dense, fastigiate; phyllaries acute; 

 pappus of very short squamellae. (Description compiled.) 



DOUBTFUL SPECIES. 



Stevia elliptica Hook & Arn. Bot. Beechey Voy. 434. 1840-41. 



Known only from the type locality, between San Bias and Tepic. 



Tail, shrubby, glandular-pubescent; leaves opposite, elliptic or ovate-elliptic, 

 serrate, triplinerved, at base short-attenuate and sessile; heads glomerate; pappus 

 of 3 or 4 awns as long as the corolla. (Description compiled.) 



Apparentlj' related to S. glandulosa Hook. & Arn. 



13. HOFMEISTERIA Walp. Repert. Bot. 6: 106. 1846-47. 



Suffrutescent or truly shrubby, branched; leaves alternate or opposite, fleshy, 



dentate to tripinnatisect, the petioles usually much longer than the blades; 



heads solitary on long peduncles, or paniclcd, medium-sized; involucre campanu- 



late, many-seriate, strongly graduate, of narrow acuminate dryish phyllaries; 



