24 ARKIV FOR BOTANIK. BAND 13. N:0 15. 



Veruonia Tuerckheimii Urb. 



Tabula nostra I, fig. 10 (pars inflorescentise). 

 Vernonia Tuerckheimii Ukban, 1912, p. 421 ; Gleason, 1913, p. 327. 



Pappi setae interiores persistentes, numero 65, rigidulse, 

 crassiusculae, paullulo complanatae, stramineo-purpurascen- 

 tes, quam exteriores inaequales, parum conspicuse circ. 8-plo 

 longiores. Corolla 7 mm longa, tubo amplo, glabro long. 

 z / 3 corollae, limbi laciniis apice subtus papillosis, ceterum 

 glabris. Antherse 2,5 2,8 mm longse, ligula longa, 1 / 3 long, 

 antherse, auriculis brevissime apiculatis. 



Hab. in Hispaniola: Constanza, in declivibus pineti 

 aridis, alt. 1250 m, mense Febr. 1910, Turckheim n. 2959 

 (D, KIT, M). 



A very characteristic species, easily recognized by the 

 purple-tinged involucres and pappus. The description given 

 by Urban is excellent. 



Subsect. Graciles. 



Suffrutices vel frutices humiles. Folia membranacea, forma 

 et pubescentia varia. Inflorescentia cymoso-scorpioidea, cymis 

 elongatis, scepissime cauliformibus, calathidiis axillaribus, ses- 

 silibus, sospe geminatis; bracteis foliaceis, calathidiis longioribus. 

 Calathidia parva. Involucrum campanulatum, squamis scepe longe 

 vel longissime mucronatis. JReceptaculum planum, subnudum. 

 Pappi setm interiores persistentes, tenues, albidce, exteriores 

 distincton. Corolla vulgo 6 mm longa, limbi laciniis dorso laxe 

 pilosis. Antheroz circ. 2 mm longce. Achcenia tenuiter appresso- 

 -pubescentia. 



A very natural subsection closely related to the Arbo- 

 rescentes, and chiefly distinguished by the pubescence of the 

 clefts of corolla, further by the characteristics of the inflor- 

 escence and the involucres. The range of the subsection 

 extends from Columbia to eastern Brazil. Well-known spe- 

 cies belonging here are V. gracilis H. B. K., V. Cotoneaster 

 (W.) Less., V. Salzmannii DC. (not Baker in Fl. Bras.), 

 V. araripensis Gardn., V. acutangula Gardn., V. tricephala 



