COLOMBIAN EUPATORIUMS. 303 



deeply sulcatc, glabrous, letify; leaves opposite, petiolate, serrulate 

 except at the cuneate base, acuminate, pinnately many-veined, 10-18 

 cm. long, 2.4-5 cm. wide, firm in texture; petiole 1-2 cm. long; heads 

 20-25-flo\vered, in ample sessile compound flattish-topped or decidedly 

 convex corymbs (9-18 cm. in breadth) ; involucre canipanulate, about 

 6 mm. high and thick; scales 3-4-seriate, stramineous, lanceolate, 

 acute or acutish, often viscid; florets ochroleucous or white tinged 

 with violet (Mayor) ; achenes dark, tapering toward the base, nearly 

 or quite glabrous, 1.8 mm. long. — Hieron. in Engl. Bot. Jahrb. xl. 

 373 (1908); Heering, Mem. Soc. neuchat. Sci. Nat. v. 420 (1913). 



Antioquia: talus-slopes of the Cafetal La Camelia, near Angelopolis, 

 alt. about 1600 m., Mayor, no. 641, ace. to Heering, 1. c. 



El ^^\LLE: El Saladito, above Call, road to Buenaventura, Cordillera Occi- 

 dental, alt. 1400 m., Pittier, no. 772 (U. S.). 



Cal'ca: in thickets on plateau near Popayan, alt. 1600-1900 m., Lehmann, 

 no. 5539, ace. to Hieron. 1. c. 



Without locality: Triana, no. 1227 (K.). 



Sect. III. ExiMBRiCATA (DC.) Hoflfm. Involucre campanulate, 

 turbinate, or subcylindric, seldom more than twice as long as thick; 

 scales (persistent) l-2(-3)-seriate, most of them subequal, but often 

 1-3 of the outermost considerably and progressively reduced. Re- 

 ceptacle flat or nearly so, glabrous. — Hoffm. in Engl. & Prantl, Nat. 

 Pflanzenf. iv. Abt. 5, 140 (1890). Eupatorium ser. Eximbricata DC. 

 Prod. v. 164 (1836). Kyrstenia Neck. Elem. i. 81 (1790). Batschia 

 Moench, Meth. 567 (1794). Gyptis Cass. Bull. Soc. Philom. 139 

 (1818). Ageratiopsis Sch. Bip. ex Benth. & Hook. f. Gen. ii. 246 

 (1873). 



The separation of this section from the preceding, while practical 

 for purposes of classification, is obviously artificial. The distinction, 

 whether stated in terms of the greater equality of the involucral scales 

 and the fact that they appear to be in fewer series, or based upon their 

 relatively slighter imbrication, is incapable of precise definition and 

 unaccompanied by concomitant differences either of habit or technical 

 characters. 



Key to Species. 



a. Leaves coriaceous, reticulated, oblong to elliptical (some- 

 times ovate in E. rorulenium and E. vacciniaefolium) ; shrubs, 

 usually viscid or vernicose b. 



b. Heads 5-14-flowered or rarely (in nos. 58 and 59) 20-25- 

 flowered c. 



