148 



FIELD COLUMBIAN MUSEUM BOTANY, VOL. III. 



noid toward the summit, and alternate, decurrent, pinnately sinuately 

 lobed spinescent leaves, glabrous above, white arachnoid tomen- 

 tose beneath. Inflorescence of 

 solitary heads, terminal or in the 

 axils of the upper leaves. Heads 

 about 4 cm. high, 3-3.5 cm. 

 broad, many flowered. Invo- 

 lucre ovoid-globose, sparingly 

 arachnoid, with one or two sub- 

 tending leaflets; bracts long 

 acuminate, spine tipped, except 

 the innermost, the tips loose or 

 spreading. Corollas light purple, 

 tube very slender, limb narrow, 

 deeply 5 cleft. Receptacle dense- 

 ly clothed with soft capillary 

 persistent bristles, i cm. or more 

 long. Achene light brown, 1.6 

 x5-5>5 mm., oblong-oblanceo- 

 late; in section oval; faintly nerved, smooth and shining; pappus 

 bristles ashen, long-plumose, 2-2.5 cm - l n g- 



Hab. "Herb, 4 feet high, common at the port of Silam, April," 

 Gaunter 676 (Cnicus Mexicanus Hemsl. Field Col. Mus. Bot. 1:323). 



CHAPTALIA Vent. Hort. Gels., t. 61. 



Heads heterogamous radiate, ray flowers in i or 2 series, pistil- 

 late, fertile, ligulate; disk flowers perfect, all or some of them sterile, 

 tubular, bilabiate. Involucre campanulate of narrow appressed 

 bracts, imbricated in few series, outer gradually shorter. Receptacle 

 naked. Achenes dorsally compressed, attenuate into a neck, 5 



nerved; pappus of copious soft cap- 

 illary bristles. Acaulescent peren- 

 nial herbs, bearing a single head. 



Chaptalia albicans Vent, ex 



Steud. Nom., Ed. 2, 1:344. 

 A scapose herb; with radical, 

 oblanceolate, subacute, crenate- 

 runcinate leaves tapering into a long 

 petiole, dark green and glabrous t 

 above, white tomentose beneath. 

 Scapes slender, 12-25 cm - l n g> 

 thickened and densely white floe- 

 cose at the summit, monocephalous. 

 Heads 15-17 mm. high, 12-15 mm. 

 broad, many flowered. Involucral 

 bracts in 4 series, linear-lanceolate, 

 acuminate, white floccose on the margins, at least the outer ones, 

 inner slightly exceeding the disk, reflexed in age. Corollas purplish, 

 rays inconspicuous, ligule oblong, 3 dentate, 2-3 mm. long, erect; disk 



