146 



FIELD COLUMBIAN MUSEUM BOTANY, VOL. III. 



erect on short bracteate pedicels. Involucre ovoid-campanulate, 

 arachnoid canescent, bracts in 2-3 series, the outer shorter, linear, 

 inner broad, obtuse, scarious margined. Corollas pale yellbw, those 

 of pistillate flowers narrow, 2-4 toothed, of perfect flowers cam- 

 panulate, 5 lobed, resin dotted. Receptacle minute. Achene (not 

 fully ripe) golden brown, .5x1.2 mm., oblong, rounded at the base; 

 in section oval-rhomboid or sometimes 3 sided ; faintly striate, 

 glabrous. 



Hab. "Frequent throughout the peninsula" Valdez 40. 



Called TZITZIM,* "Wormwood" ^by the Mayas, and "AGENJO DEL 

 PAIS" in Spanish. It is used throughout the peninsula by the Mayas, 

 Mestizas, and Yucatecans as a bitter stimulant tonic, emmenagogue, 

 .and anthelmintic. Dose from 2 to 4 grams of the powdered leaves 

 and flower heads. x 



ERECHTITES Raf. Fl. Ludov., 65. 



Heads heterogamous,. discoid; the outer 2 to several series pistil- 

 late, fertile, filiform-tubular; inner flowers perfect, fertile, tubular. 

 Involucre cylindrical, of numerous, erect, connivant, herbaceous equal 

 bracts, subtended by a series of short, loose accessory bracts. Recep- 

 tacle concave, naked. Achene subterete, ribbed; pappus of copious, 

 capillary, soft, smooth, white bristles. Annual herbs. 



Erechtites hieracifolia 1 (L.) Raf. DC. Prod., 6:294. 



Senecio hieracifolia L. 



Erect, with striate-sulcate stem and branches, glabrate 

 scattered weak hairs, and alternate, simple or pinnately lobed or 

 dentate leaves, lanceolate in out- 

 line, the upper clasping, sometimes 

 auricled, the lower narrowed into a 

 petiole, glabrate or with scattered 

 hairs. Inflorescence of terminal, 

 cymose panicles; branchlets and 

 peduncles cobwebby pubescent. 

 Heads 13-15 mm. high, 6-7 mm. 

 broad, many flowered. Involucre 

 arachnoid; bracts linear, acute, 

 reflexed in age; accessory bracts 

 linear, arachnoid-ciliate. Corollas 

 yellowish white, those of pistillate 

 flowers filiform, 4 toothed; of per- 

 fect flowers, very slender tubular, 

 4 or 5 toothed. Receptacle con- 

 cave, becoming convex at maturity. Achene light brown, 

 mm., oblong, narrowed at apex and base; in section 5 sided 

 outline; 10 ribbed, interspaces pubescent, apex expanded into 

 disk; pappus bright white, caducous, 12-15 mm - 



or with 

 incised. 



.6x3.8 

 oval in 

 a small 



*This appellation savors of Spanish intervention; its root, in Maya, means "essence." 



