1418 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM 



DOUBTFUL SPECIES. 



Vernonia hypoleuca DC. Prodr. 5: 27. 1836. Probably not a Vernonia. 



Vernonia purpurascbns Schultz Bip.; Walp. Rep. 2: 945. 1843. Eremosis 

 purpurascens Gleason, Bull. N. Y. Bat. Gard. 4: 233. 1906. This species has 

 been referred by Gleason • to the synonymy of Eremosis tomentosa {—Vernonia 

 monosis), but the heads are described as 3-fiowered, while they are 1-fiowered in 

 that species. 



2. OLIQANTHES Cass. Bull. Soc. Philom. Paris (1817: 10. 1817, hyponym;) 



1818: 58. 1818. 



Reference: Gleason, Bull. N. Y. Bot. Gard. 4: 235. 1906. 

 I. Oliganthes oxylepis Benth.; Benth. & Hook. Gen. PI. 2: 233. 1873. 



Known only from the type locality, Yucatdn or Tabasco. 



Suffrutcscent (?), "0.5 to 0.6 meters high;" stem tomentose; leaf blades 

 rhombic, 8 to 11 cm. long, 3 to 4.5 cm. wide, acute at each end, crenate-dentate, 

 short-petioled, ciuickly glabrate and green above, densely ochroleucous-tomentose 

 beneath; heads 8 or 9-fiowered, sessile or subsessile in small clusters at tips of 

 branches; involucre 9 to 10 mm. high, about 6-seriate, graduate, the phyllaries 

 drj', lanceolate, glabrous, cuspidate-attenuate, erect or slightly spreading at tip; 

 achenes turbinate, 7 or 8-ribbed, glabrous; pappus a low entire crown. 



3. PIQUERIA Cav. Icon. PI. 3: 18. pi. 235. 1795. 



Reference: Robinson, Revision of the genus Piqueria, Proc. Amer. Acad. 42: 

 4-16. 1906. 



The genus was named for A. Piquer, a Spanish physician of the eighteenth 

 century. Piqueria trinervia Cav., a widespread herbaceous species of Mexico, 

 is grown frequently in greenhouses for its handsome fragrant white flowers. The 

 following vernacular names are reported for this species: "Hierba del tabardillo" 

 (Pucbla, Jalisco) ; "hierbadeSan Nicolds," "yoloxiltic," "xoxonitzal" (Hidalgo); 

 "tabardillo" (Zacatecas). An infusion of the leaves is employed locally as a 

 remedy for typhoid fever. 



1. Piqueria serrata A. Gray, Proc. Amer. Acad. 15: 25. 1880. 



San Luis Potosi; type from Alvdrez Mountains. 



Shrubby; stem obscurely bifarious-puberulous; leaves opposite, short-petioled, 

 the blades ovate-oblong, 7 to 9 cm. long, 2.5 to 4 cm. wide, acuminate, abruptlj' 

 narrowed at base, coarsely and sharply serrate; heads small, numerous in small 

 rounded cymose panicles, 3-flowered; phyllaries elliptic-ovate, 3-nerved, rounded, 

 mucronate, erose-ciliate; flowers white; achenes 5-angled, glabrous, with a 

 deciduous annulus. 



la. Piqueria serrata angustifolia Robins. & Greenm. Amer. Journ. Sci. III. 

 50: 151. 1895. 



Known only from the type locality, Sierra de San Felipe, Oaxaca. 



Leaves lanceolate, obscurely crenate-serrate. 



4. DECACHAETA DC. Prodr. 5: 133. 1836. 



1. Decachaeta haenkeana DC. Prodr. 5: 133. 1836. 



Sinai oa to southern Mexico; type from Mexico, without definite locality. 



Suffrutcscent, erect; leaves alternate, the blades oblong or obovate-oblong, 

 8.5 to 25 cm. long, 2.3 to 5 cm. wide, serrate, reticulate, short-petioled, puberulous 

 beneath; heads numerous, sessile and clustered on short peduncles in thy r sold 

 panicles on axillary branches; heads 7 mm. high; involucre graduated, the 

 phyllaries dry, scarious-margined; flowers whitish; achenes black, 5-angled; 

 pappus bristles 10 to 15 in a single series, hispidulous, slightly dilated at tip. 



1 N. Amer. Fl. 33: 100. 1922. 



