360 COMPOSITiE. Ximenesia. 



rays rugose, wingless. DC. ! prodr. I. c. Pallasia serratifolia, Smith, in 

 Rees, cycl. 



Florida, Dr. Chajmian ! Mr. Croom ! Probably introduced. 



111. SANVITALIA. Guall. in Lam. jour. hist. nat. 2. p. 176, t. 33, 8f 

 ill. t. 686 ; Cav. ic. 4. t. 351 ; DC. prodr. 5. p. 628. 



Heads many-flowered ; the ray-flowers ligulate, in a single series, the 

 ligules persistent. Scales of the involucre somewhat imbricated in 2-3 

 series, appressed ; the innermost ratheL longer and equalling the disk. Re- 

 ceptacle conical or convex, chaffy ; the chaff' oblong, partly clasping the 

 flowers. "Corolla of the disk articulated above the ovary, pihferous," DC. 

 Branches of the style terminated by a short cone. Achenia of the ray, 

 larger, 3-sided, smooth, crowned with 3 diverging smooth conical awns ; of 

 the disk compressed ; the exterior ones muricate or roughened and nearly 

 awnless ; the interior more or less winged and ciliate, crowned with 2 minute 

 awns. — Annual (chiefly Mexican) dichotomous or trichotomous mostly hairy 

 herbs. Leaves opposite, ovate, triplinerved, usually entire, tapering into 

 a ciliate or hairy petiole. Heads solitary and terminal, sessile between the 

 uppermost pair of leaves. Rays yellow : the disk purplish. 



1. S. ocymoides (DC.) : stem diffuse, rather erect ; leaves ovate ; awns of 

 the ray longer than the ligules ; achenia of the disk compressed-tetragonal; 

 the exterior muricate, wingless, slightly 2-awned ; the interior smoother, 

 somewhat winged, with rather longer awns. DC. ! I. c. 



Texas, Berlandier ! — Leaves, including the ciliate petioles, about an inch 

 long, strigose. Plant with wholly the habit of S. procumbens* 



Subtribe 3. Flaverie^, Less. — Heads 1-few-flowered, densely aggre- 

 gated, heterogamous with a single pistillate ray-flower, the others perfect ; or 

 sometimes homogamous (rarely with the pistillate flowers in several series, 

 when the innermost are perfect but sterile). Branches of the style usually 

 not appendiculate. Receptacle naked, except when the head is many- 

 flowered. Achenia wingless, somewhat terete, attenuate at the base. Pap- 

 pus none. — Herbs, with opposite triplinerved or nervose leaves. Flowers 

 yellow. 



■ 112. FLAVERIA. Juss. gen. p. 168; DC. prodr. 5. p. 635. 



Heads in glomerate fascicles, few-flowered, either discoid, the flowers all 

 tubular and perfect, or with a single pistillate ray-flower. Involucre oblong, 

 of 3-4 connivent nearly equal scales, the outermost broader and somewhat 

 concave. Receptacle small, naked. Achenia oblong or subclavate, striate, 

 glabrous, naked. — Annual or rarely perennial (tropical and South American) 

 herbs ; with opposite mostly sessile leaves, toothed or entire. Corolla pale 

 yellow. 



1. F. linearis (Lagasca) : suffiruticose at the base, somewhat procumbent, 



