8 ARKIV FÖR BOTANIK. BAND 13. N:0 15. 



Vernonia Schreb. 



Key to the West Indian sections. 



I. Inner involucral scales with dilatated, membranaceous, 

 pnrplish-green tips. Bristles of the inner series of pappus 

 broad, flat, caducous. Tube '/s in length of the corolla. 



Sect. Stengelia. 

 II. Tips of the scales not dilatated. Bristles of the inner 

 series of pappus filiform or very inconspicuously flattened. 

 Tube not over Vs of the corolla. 



A. Inner scales caducous. Sect. Critoniopsis. 



B. Inner scales persistent. 



1. Inner bristles of pappus persistent. Achenes con- 

 spicuously 10-costate. Sect. Lepidaploa. 



2. Inner bristles caducous. Achenes faintly ribbed. 



Sect. Tephrodes. 



Sect. Stengel ia (Sch.-Bip.) Benth. 

 Teriionici anthelmintiea (L.) Willd. 



Conyza anthelmintiea Linn^us, 1763, p. 1207. 

 Vernonia anthelmintiea Willdenow, 1804, p. 1634. 



Pappi setse interiores caducae, numero circ. 30(?), fir- 

 mse, valde complanatae, pallide straminese, exterioribus late 

 linearibus circ. 8-plo longiores. Corolla glabra, 9 mm longa, 

 tubo gracili, superne subito dilatato, long. Vs corollae, limbi 

 laciniis brevibus, apice papillosis. Antherae fere 2 mm longse, 

 ligula long. V5 antherse, auriculis acutis. 



Hab. in Jamaica: Green Harbour, alt. 540 m, 13. 12. 

 94, Harris n. 5472 (BB, Br, KU, M). 



A well known, widely distributed species of the Old World, 

 introduced in Jamaica. 



Sect. Critoniopsis (Sch.-Bip.) Benth. 

 Veriiouia tetraiitha (Urb.) Ekman nov. comb. 



Piptocarpha tetrantha Urban, 1S99. p. 457; 1911, p. 020; CtLEAson, 

 1906 h, p. 160. 



Hab. in Porto Rico. 



