94 PROCEEDINGS OP THE AMERICAN ACADEMY. 



Mexico. State of Puebla : calcareous hills near Tehuacan, altitude 

 1725 m., 22 August, 1901, O. G. Pringle, no. 8570 (lib. Gr.). 



Archaetogeron purpurascens. An herbaceous perennial, pubes- 

 cent throughout with mostly appressed-hirsute hairs : stem erect or 

 ascending, simple or branched, 2 to 4 dm. high : lower leaves oblanceo- 

 late, 2 to 6 cm. long, 3 to 10 mm. broad, obtuse, subentire to rather con- 

 spicuously toothed with remote spreading teeth, the uppermost leaves 

 lanceolate and entire : heads terminating the stem and branches on 

 rather long peduncles, including the rays about 2.5 cm. broad ; involucral 

 scales 2-3-seriate, narrowly lanceolate, acuminate, appressed-pubescent : 

 ray-flowers in about 3 series, numerous, deep purple : disk-flowers numer- 

 ous ; pappus coroniform, of united more or less lacerated scales. — 

 Mexico. State of Chihuahua: Sierra Madres, near Colonia Garcia, 

 altitude 2450 m., 27 July, 1899, Townsend & Barber, no. 175 (lib. Gr.). 



Erigeron adenophorus. Suffruticose : stem branched ; branches 

 hirsute, and more or less glandular-pubescent, leafy towards the tip: 

 leaves sessile, crowded, amplexicaul, at first erect or spreading, later 

 reflexed, lineardanceolate, 1 to 2 cm. long, 2 to 5 mm. broad, mucronate- 

 acute, sparingly dentate with minute spreading subcartilaginous teeth, 

 densely glandular-pubescent intermixed with long jointed flaccid hairs ; 

 margins revolute : inflorescence terminating the stem and branches in 

 dense round-topped corymbose cymes : heads about 1 cm. high : involucre 

 campanulate ; bracts 3-4-seriate, lance-linear, acute, the outer densely 

 pubescent with long jointed subflaccid and somewhat matted hairs, the 

 inner terminated by a glabrous purplish tip : ray-flowers mostly 2-seriate ; 

 achenes strongly compressed, with thick nerviform margins and a single 

 nerve on either surface, puberulent ; corolla-tube slender, puberulent, 

 slightly ampliated and expanded above into a purplish minute incon- 

 spicuous ligule, or remaining essentially tubular ; style included: disk- 

 flowers numerous ; the 5-toothed limb of the corolla deep purple at least 

 in the dried state ; achenes like those of the ray-flowers. — Senecio erio- 

 cephalus, Klatt, Bull. Soc. Bot. Belg. xxxi. 212 (1892), and Leopoldina 

 xxxi. (1895) Beiblatt, p. 7. — Costa Rica. Entre le Rancho del Jabon- 

 cillal et le sommet de Cerro de Buenavista, et les roches, altitude 3100 

 m., 19 January, 1891, H. Pittier, no. 3425 (lib. Gr.). 



A careful examination of the type of Senecio eriocephalus, Klatt, shows 

 very clearly that the plant is widely remote from Senecio ; its affinity is 

 rather with Erigeron and Conyza. Because of the comparatively small 

 number of ray-flowers and the character of the same, namely the included 

 style, and the distinctly nerviform margins of the compressed achene, it 



