332 ROBixsox. 



described by J. R. Johnston, and portions of the delta region of the 

 Orinoco Valley, traversed by Rusby & Squires in their journey of 

 1896. 



Of the species here enumerated, nearly all rest, as to their Vene- 

 zuelan occurrence, upon specimens from definitely located places 

 within the present limits of the country. However, a few (nos. 1, 7, 

 21, and 30), although examined in specimens said to have come from 

 Venezuela, have either been unaccompanied by more definite locality, 

 or have had place-names not capable of location by any of the maps 

 or atlases available. Of no. 16 {E. vifalbac) no Venezuelan material 

 has as yet been seen or reported, but the species is known so close to 

 Venezuela and is so frequent on both sides of the country as to make 

 its ultimate discovery within the limits of Venezuela almost certain. 



In all these cases it has seemed best to err rather on the side of 

 fullness than of critical elimination in drawing up the present list 

 and therefore to include all species even somewhat vaguely recorded 

 for Venezuela. 



For a key to the sections of the genus reference may be made to 

 p. 269. 



Sect. I. Cylindrocephala DC. (see p. 270). 



Key to Species. 



Leaves pointed (acutely or at least obtusely) at the base b. 

 b. Pedicels suleate-angulate, glabrous c. 



c. Leaves lanceolate, caudate-acuminate; involucre obtuse 

 in bud d. 

 d. Heads 45-75-flowered; leaves 3-nerved above the base 



1. E. pellium. 

 d. Heads 10-20-flowered; leaves definitelj- pinnate- 

 veined 2. E. Moritzianum. 



c. Leaves ovate, obtusish to short-acuminate; involucre 



acute in bud 3. E. laeiigatum. 



b . Pedicels terete or nearly so, pubescent or puberulent e. 

 e. Involucral scales subherbaceous at tip /. 

 /. Leaves lanceolate to narrowly oblong or linear; heads 



about 20-flowcred 4. E. ivaefolium. 



f. Leaves rhombic-ovate; heads 4.5-GO-flowored 5. E . urticoides. 



e. Involucral scales often somewhat more deeply colored 



but in texture not much changed at tip g. 



g. Leaves strongly buUate above, narrowly lanceolate, 

 attenuate to a subsessile base 6. E. 7»cridense. 



g. Leaves never strongly bullate above, ovate /(. 

 h. Scales rounded at the tip or slightly narrowed to an 

 obtuse point i. 

 i. Leaves usually 0-10 cm. long; veins not forming 



